FDTD Solutions资料集锦专题资料(二)
ASAP and FDTD Solutions
ASAP-FDTD Solutions interoperability commands in ASAPIn the initial stage of development, interoperability between ASAP 2005 and FDTD Solutions is restricted to exchange of complex field information. A new import/export command, CVF, was added to the ASAP 2005 kernel for this purpose. This command serves two functions:•Writes information contained in an ASAP *.DAT to FDTD Solutions input field format *.FLD.•Reads *.FLD files of FDTD Solutions and converts the information into a *.DAT file compatible with ASAP. CVF (Complex Vector Field)SyntaxRemarks•EXPORT or IMPORT indicates the direction of data exchange, from or to ASAP, respectively.•format indicates the manner of data exchange. Currently, only LUMERICAL is supported.•dist_filespec optionally specifies a distribution file native to ASAP by either name or unit number; the filename may have a three-letter extension; if a filename is provided without an extension, .dat is assumed; if neither a name nor a unit number is provided, the bro029.dat file is used by default; preexisting files areoverwritten on output.•exch_filespec optionally specifies a file for data exchange by name; the filename may have a three-letter extension; if a filename is provided without an extension, .fld is assumed; if no filename is provided, cvf.fld is assumed.Typically in ASAP, a CVF EXPORT command is used to export a field sampled using the FIELD command. The FIELD command must precede the use of a CVF command. We therefore need to specify both the area over which the field is to be calculated by using a WINDOW command, and set spatial resolution by using a PIXELS command to avoid phase ambiguities. Autoscaling the WINDOW is not recommended.NOTE: WINDOW dimensions may have a profound impact on the run times of FDTD Solutions.The following example script excerpts illustrate a generic application of the CVF command.NOTE: At this point, the ASAP task must be temporarily suspended. The simulation continues after we make a manual transition to FDTD Solutions. When we have completed the FDTD Solutions portion of the task, the simulation resumes in ASAP by first importing the processed field then performing a Fourier decomposition.•Fourier decomposition depends upon WINDOW size, PIXELS resolution and FTSIZE set during the previous FIELD calculation and cannot be altered as part of the DECOMPOSE.•The DECOMPOSE command Fourier transforms only one component of the field at a time; for example, to decompose properly a vector field propagating mostly in the Z-direction.Support NoteBRO provides technical support for issues related only to ASAP at support@.All inquiries related to the functionality of FDTD Solutions should be directed to Lumerical at support@.ASAP-FDTD Solutions interoperability commands in FDTD SolutionsAt this stage of development, interoperability between ASAP 2005 and FDTD Solutions is restricted to exchange of complex field information. A new source type called ASAP Source has been added to FDTD Solutions for this purpose. As well, several scripting commands have been added. The purpose of the ASAP Source and scripting commands is to: •Import field data from ASAP 2005 in the *.fld format to be used as a source in FDTD Solutions•Export field data from FDTD Solutions in the *.fld format for use as a source in ASAPASAP SourceASAP sources are used to import electric field data produced with ASAP ray-tracing design environment. The ASAP source allows the user to input field profile data produced by ASAP as a radiation source within the three-dimensional FDTD Solutions design environment. ASAP sources are only available in 3D simulations. For details on all the parameters of the ASAP sources, please consult the FDTD Solutions Reference Guide.Scripting CommandsThe following scripting commands are available for exporting and importing data to the *.fld file format:Command Descriptionasapexport(“monitorname”); Exports the desired monitor to a file for interfacing withASAP 2005. These files are called fld files. The monitormust be a frequency power or a frequency profilemonitor. By default, the first frequency point is exported. asapexport(“monitorname”,f); Exports the specified frequency point.asapexport(“monitorname”,f,"filename");Exports to the specified "filename" without opening afile browser window.asapimport("sourcename"); Imports a file in the BRO/Lumerical interface format tothe desired source.asapimport("sourcename","filename"); Imports a specified file in the BRO/Lumerical interfaceformat to the desired source without opening a filebrowser window.asapload; Load data from an fld file. After loading, you can getdata using getasapdataasapload(“filename”); Loads data from an fld file called “filename” withoutopening a file browser window.getasapdata(“data”); After loading an asapfile with asapload, you can extractany desired data. Data can be•Ex, Ey, Ez, Hx, Hy, Hz, x, y, z•power, frequency, wavelength, indexFor example the commandsasapload(“testfile”);Ex = getasapdata(“Ex”);x = getasapdata(“x”);y = getasapdata(“y”);image(x,y,pinch(real(Ex)));Can be used to image the real part of the electric field inan fld file containing data over a surface in the x-y plane. For more details on using the scripting environment, please consult the FDTD Solutions Reference Guide and the examples in the FDTD Solutions Getting Started.Support NoteAll inquiries related to the functionality of FDTD Solutions should be directed to Lumerical at support@. BRO provides technical support for issues related only to ASAP at support@.Figure 1. Macroscopic optical system to be modeled with ASAPFigure 2. Microscopic optical system to be modeled with FDTD Solutions.The illumination is from the backside, where the pit appears as a “bump”.This example is separated into three steps:Step Purpose ProductASAP 20051Model the macroscopic optical system that delivers the output of a laserdiode source to the a focused spot at the surface of the DVD diskFDTD Solutions2Model the interaction of the focused beam witha. a sub-wavelength metal DVD pitb. a flat, metal DVD surface andASAP 20053Model each reflected beam through the optical collection system to a detectorsurface. Calculate the signal modulation depth due to the presence of the sub-wavelength DVD pit.Step 1: Macroscopic beam delivery to the DVD surfaceThe macroscopic optical system, shown previously in Figure 1, as modeled in ASAP, is comprised of a beamsplitter and two focusing elements, which deliver the output of a laser diode source to the DVD disk. The return beam is collected and routed by reflection in a cube beamsplitter through a focusing optic to a signal detector.The script that generates this optical system is dvd_lumerical.inr. After setting up the optical system model in ASAP, the source is traced to a dummy plane located in close proximity to the DVD surface as shown in Figure 3. Note that no microscopic DVD surface features are included in the ASAP model. A FIELD calculation stores the complex vector electric field in a cincoming.dat file, which is then exported to FDTD Solutions file format using the CVF command. The file is saved as cincoming.fld. The energy distribution at the dummy plane 140 nm above the landing is shown in Figure 4. Note that WINDOW dimensions, PIXELS setting and location of the dummy plane may require iteration in order to arrive at the conditions suitable for an accurate FDTD simulation. In this case, a 4μm × 4μm WINDOW insures all the focused energy is captured within the window. A choice of PIXELS 101 provides spatial resolution necessary to avoid phase ambiguities. After completed the export operation, the ASAP session is suspended and the user switches to FDTD Solutions to continue the simulation.Dummy SurfaceLand Surface140 nmPMMAFigure 3. Dummy plane 140 nm above the DVD land surface, where the focused beam is recorded with ASAPFigure 4. Energy distribution at the dummy plane as recorded with ASAPWe proceed by constructing the DVD surface and assigning optical properties to the geometry in FDTD Solutions.Step 2: Modeling the sub-wavelength features of the DVD surfaceFor the second step of the problem, open FDTD Solutions. Open the example file dvd_ASAP.fsp. This file can be found in the default examples directory and is used in one of the advanced examples of the FDTD Solutions Getting Started manual.The geometry consists of a landing and a ‘bump’ as shown in Figure 5. The optical properties of the entire structure are defined by a NIR dispersive model for gold immersed in PMMA.Figure 5. Sub-wavelength DVD pit or “bump”, drawn in the CAD Layout Editor of FDTD SolutionsThe source (grey box with purple arrow), the reflection monitor (yellow rectangle), and relevant geometry are enclosed in a simulation volume (orange cubic volume). The choice of source insertion point and simulation volume dimensions serve to minimize calculation time, while preserving the necessary attributes to accurately model the physics. NOTE: FDTD Solutions does not allow the source and monitor planes to be co-located therefore the monitor plane (and thus the plane from which the result is exported back to ASAP) and the source injection plane must be separated by at least 1 grid spacing (20 nm in this case).The following steps show how to setup, run and analyze the simulations of the sub-wavelength DVD pit, as well as export the resulting data back to an fld file to be re-imported into ASAP.2a. Set up the material properties1.If you are in analysis mode (the Analysis window is open), open the SIMULATION menu and select SWITCHTO LAYOUT EDITOR.2.Select the STRUCTURES tab and make sure that the DVD bump has the following dimensions.property valuex position 0 μmx span 0.32 μmy position 0 μmy span 8 μmz min -0.12 μmz max 0 μm3.In this example, the wavelength is 650 nm. We want to make sure that both the DVD bump and the goldsubstrate use the following material properties. Note that you can set them both by selecting both objects and editing their group properties.property valuematerial Au (gold) :: VIS 400-750nm2b. Load the field data into the ASAP Source•If there is not already an ASAP source, create one by clicking the ASAP button on the SOURCES tab. •Open the property edit window of the ASAP source, which is shown in Figure 6.Figure 6. Property edit window of an ASAP source in FDTD Solutions•Click the Read ASAP Source button and choose the file cincoming.fld, which was created from the data in cincoming.dat with the ASAP command CVF.•Try plotting the current field by clicking Plot Current Field, you will see the same plot as Figure 7.Figure 7. The electric field intensity imported from ASAP to FDTD SolutionsNotice that this spot is has an x span of approximately 1 μm and a y span of approximately 2 μm. For this spot configuration, the track length is in the y direction, and the track width is in the x direction.•Set the following properties of the ASAP source:property valuename asapx 0 μmy 0 μmz 0.02 μmdirection Backward•Verify that the ASAP source is defined to operate at a wavelength of 650 nm by selecting the FREQUENCY/WAVELENGTH tab of the ASAP source. This wavelength is the same as the wavelength defined in the file cincoming.fld when it was exported from ASAP. You can change this wavelength if you like, but it is automatically set when you load the data.•On the FREQUENCY/WAVELENGTH tab, you will notice from the SIGNAL VS TIME plot that the simulation is not long enough and truncates the source signal. To correct this, select SET TIME DOMAIN.Change the pulselength property to 3 fs and the offset to 6 fs.•Click OK to accept all the source changes.2c. Modify the simulation regionWe imported a field from ASAP that covers a 4x4 μm2 region. However, the spot is smaller than this. It is sufficient to simulate a region of approximately 3x6 μm2.•Edit the FDTD Simulation region and set the following properties:property valuex span 3 μmy span 6 μmsimulation time 25 fs•On the Advanced Options tab, make sure that the “meshing refinement” property is set to 0. For most materials it is desirable to average their physical properties near interfaces but for metals, such as gold, this is not always desirable. You can disable this feature by setting a value of zero for the “meshing refinement”. Notice that the ASAP source is larger than the simulation region. The simulation will use only the portion of the ASAP source that is within the simulation.2d. Verify the frequency monitorEdit the properties of the field monitor. You wi ll notice that this monitor has changed to record data at a frequency of 461.219 THz because the USE SOURCE LIMITS checkbox is on. In wavelength, this is 650nm. This is the desired frequency of operation with the ASAP source.2e. Run the simulationRun the simulation, which will take from 2 to 15 minutes, depending on the speed of your computer.2f. Analyze the dataPlot the Ey electric field component versus time, you will see the plot shown in Figure 8.Figure 8. Electric field component Ey as a function of timeYou can see that the signal is short and decays quickly. The simulation has been run for long enough to collect all the data.Figure 9. Electric field component Ey at a single frequency/wavelength as a function of position in the near field Use the far field projection to plot the electric field intensity in the far field, it will look like Figure 10.Figure 10. Electric field intensity at a single frequency/wavelength as a function of angle in the far field2g. Export the results back to ASAPTo bring the reflected signal back into ASAP where it can be used to optimize the collection optics, you will need toA file chooser window will appear that will allow you to select a name for your data. Choose coutgoing.fld and save the file. There are a variety of optional arguments for importing and exporting ASAP files using the two scripting commands asapexport and asapimport. Please refer to the FDTD Solutions Reference Guide for details.2h. Rerun the simulation with no bumpTo compare the modulation with and without the bump, you will need to rerun the simulation without the presence of the bump.•From the FILE menu, choose SAVE AS and save the file as dvd_ASAP_blank.fsp•From the SIMULATE menu, choose SWITCH TO LAYOUT EDITOR and click OK when prompted.•Rerun the simulation.•From the script prompt type the following command:asapexport("reflection");When the file chooser appears, select the filename cboutgoing.fld.You can now import the data from coutgoing.fld and cboutgoing.fld into ASAP.Step 3: Modeling the reflected beam to the detectorThe return beam is collected and routed by reflection in a cube beamsplitter through a focusing optic to a signal detector.The resulting *.fld files created in Step 2 can now read into ASAP by invoking a CVF command with the IMPORT option.The imported field is converted to traceable rays by means of a directional decomposition, namely DECOMPOSE DIRECTION. Since the source originates inside the PMMA material, the IMMERSE command must precede DECOMPOSE DIRECTION. Note also that the DECOMPOSE DIRECTION command operates on only one polarization component at a time. Therefore, a POLARIZ command must precede decomposition of the x-, y- and z-components of the field.A brief section of ASAP script, dvd_lumerical.inr, is shown in Figure 11 as an example of the import of the FDTD Solutions file. Here, a limiting cone angle has been specified to match the solid angle subtended by the collection optics. The minus sign on the DIRECTION option indicates the direction of propagation. Also, the sources must be IMMERSEd and shifted to the appropriate location since geometries in ASAP and FDTD Solutions are completely independent of one another.Figure 11. Excerpt from ASAP script showing how to import data from fld file created by FDTD Solutions NOTE: ASAP does not propagate evanescent fields as part of its Gaussian Beam Decomposition method. As a result, it is not necessary in this case to decompose and attempt to trace the z-polarized field component, since this field component would propagate perpendicular to the optical axis.The dvd_lumerical.inr script file calculates the signal at the detector with the bump (coutgoing.fld ) and without the bump (cboutgoing.fld ). The results of the ENERGY at the detector are shown below. Diffraction due to the presence of the bump scatters a significant portion of the incident energy out of the reflected beam that arrives at the detector surface. Results of the ENERGY at the detector are shown in the table below. Diffraction that is due to the presence of the bump has scattered a significant portion of the incident energy out of the reflected beam. As a result, the peak irradiance and the total energy at the signal detector is reduced by approximately 30 times in the presence of the bump. Blank DVD surface (no bump) DVD surface with bump ENERGY MAX 10.35034 0.3779390 ENERGY INTEGRAL 0.4438739E-04 0.1522924E-05Results at the signal detector are plotted in Figures 12 and 13.Figure 12. Cross-section of irradiance at the detector, without and with the bump.a. without the bumpb. with the bumpFigure 13. Irradiance patterns at the detector, without and with the bumpBump No bumpYou can optimize the shape and size of the DVD bump using FDTD Solutions, as well as to optimize the beam delivery and collection optics using ASAP.•For optimization in FDTD Solutions, please see the related DVD Examples in the FDTD Solutions Getting Started manual.。
FDTD Solutions 帮助 _ Quality factor calculations
知识库安装和设置入门教程参考指南用户指南应用实例天线艺术ASAPBSDF谐振腔CMOS增益材料缺陷检测光栅OLEDs材料科学超材料显微镜多层堆叠結構非线性光学镊子光子晶体太阳能电池表面等离子波导A cavity is called a low Q cavity when the electromagnetic fields decay completely from the simulation in a timeFDTD Solutions 在线帮助Quality factor calculations FDTD Solutions product page Training workshop schedule Webinar schedule Download page)SearchResonance 2:frequency = 205.814THz, or 1456.62 nmQ = 77.498 +/- 0.226738The analysis script also creates two plots. The plot shown below to the left contains one of the field components (Hz). You can see that the fields have decayed by the end of the simulation time. The second plot shows the location and relative amplitude of the resonance peaks.Note that the initial transients of the source are neglected by setting the "start time" for the time monitors to 200fs. The "start time" for the time monitors is the time at which the monitors begin recording data. This setting can be changed in the user properties for the analysis group. Also, note that in the analysis group, it is possible to use one time monitor or an array of time monitors for the Q factor calculation. The problem with using one time monitor is that if the one monitor is placed at or near a null of the cavity mode, then due to the fact that the field intensity is very low, the Q factor can have a large uncertainty (if it is even possible to obtain a meaningful result).The low_quality_factor_3D.fsp simulation file contains a 3D version of the low Q analysis object.High Q cavitiesA cavity is considered to be a high Q cavity when the electromagnetic fields cannot completely decay from the simulation in a time that can be simulated reasonably by FDTD. In this case, we cannot determine Q from the frequency spectrum because the FWHM of each resonance in the spectrum is limited by the time of simulation,Tsim , by FWHM ~ 1/Tsim. Instead, the quality factor should be determined by the slope of the envelope of thedecaying signal using the formulawhere fRis the resonant frequency of the mode, and m is the slope of the decay in SI units.Derivation of Q factor formula:The quality factor (Q) is defined aswhere wris the resonant frequency and FWHM is the full width half max of the resonance intensity spectrum. The time domain signal of the resonance is described bywhere α is the decay constant. The fourier transform of E(t) is easy to calculate.The maximum value of |E(w)|^2 is clearly 1/α^2, at w=wr. With a little more work, we can determine that thehalf max frequencies occurs at w=wr + α and w=wr- α. Therefore, FWHM = 2α. Substituting this value intothe original Q formula and solving for α givesNow that we know how to relate α to Q, we must determine how the slope of the time signal decay is related to Q. We must take the log of the time signal to make the envelope a linear function.where m is the slope of the log of the time signal envelope. Solving for Q, we get.Example:Calculation of the Q factor for high Q cavities is complicated because•separating the decay of the envelope from the underlying sinusoidal signal is difficult since the fields are typically real-valued•if there are multiple resonant modes, they will interfere with each other in the time domain, making it hard to estimate the decay rate.By opening the edit dialog box for the Q factor analysis object located in quality_factor_3D.fsp, you can see that the analysis object solves these problems by•accurately calculating the envelope of the time-domain field signal•isolating each resonance peak in the frequency domain using a Gaussian filter, and then taking the inverse Fourier transform to calculate the time decay separately for each peak. The slope of the time decay is then used to calculate the Q factor and obtain an error estimate.In addition, note that:•the Q analysis object has setup variables that allow you to choose how many time monitors to use to calculate the Q factor. It is often a good idea to add a few point monitors at different locations to reduce the chances that a monitor is placed at a node in the mode profile of a cavity mode yielding a weak signal.•in the analysis tab, there is a parameter that can be set to choose how many resonant peaks to look for •all the field components that are available are used to calculate the Q factor•it is possible to change other parameters, such as the Gaussian filter width and resolution in the frequency domain. These parameters are set in the analysis script.•in the script, only the part of the time signal lying in 40-60% of the time signal collected is used for the slope calculation. These percentages can easily be changed. However, setting the upper limit to anything greater than 90% can lead to errors due to the fact that Fourier transforms, and inverse transforms were used when the Gaussian filter was used to isolate the peak. The Fourier transforms introduce errors to the end of the time signal due to the fact that discrete Fourier transforms assume periodicity of the signal.Next, run the simulation. When the simulation is complete, choose to edit the analysis object and press RUN ANALYSIS button. The analysis script output will contain the location of the resonance frequencies and their corresponding Q factors.Resonance 1:frequency = 178.786THz, or 1676.82 nmQ = 306.279 +/- 1.41318Resonance 2:frequency = 227.307THz, or 1318.89 nmQ = 274.874 +/- 4.50921The analysis object also produces the following plots.The time decay of the field components and their envelopes. Note The spectrum and the Gaussian filtersThe spectrum of resonances. Each resonant peak appears in a The time decay of the sum of squared Other versions of this page:Events。
微纳光子学设计分析软件FDTD Solutions专题资料集锦(三)
corresponding bulk materials. The influence of microstructures on
thermal conductivity has been investigated by many researchers, however their effect on radiative heat transfer is seldom studied.
application. In this paper, the conventional geometrical optics
ray-tracing method is updated by considering the effect of the interference. Two geometrical optics ray-tracing methods and a finite different time domain method are used to study the radiative properties of a one-dimensional random rough surface.
arrays for photovoltaic applications.pdf
椭圆硅纳米线阵列的宽带吸收增强光伏应用 Semiconducting nanowire arrays have emerged as a promising route
toward achieving high efficiencies in solar cells. Here we propose
originated from the split of the principal modes as well as the excitation of high order modes caused by the asymmetry ofires and the enhanced mode coupling between
FDTD介绍范文
FDTD介绍范文FDTD（Finite-Difference Time-Domain）是一种电磁场数值模拟方法，可以用于求解Maxwell方程组。
它是一种基于有限差分的时域方法，将时域的Maxwell方程组进行离散化，然后在离散化的网格上进行数值计算。
FDTD方法的特点是简单易实现、计算稳定、准确度高，因此在电磁学领域得到了广泛应用。
FDTD方法最早于1966年由Kane Yee提出，它的基本思想是将Maxwell方程组从连续的时域转化为离散的时域。
具体而言，FDTD方法将空间和时间均分成离散的网格，然后在这些网格上计算电磁场的演化。
根据Maxwell方程组的形式和物理意义，可以将其离散为电场和磁场的更新方程。
通过不断迭代更新电场和磁场的数值，FDTD方法可以模拟出电磁场在时域中的传播和变化过程。
FDTD方法的核心是使用差分格式对Maxwell方程组进行离散化。
一般情况下，FDTD方法采用中心差分格式，即将每个场分量的二阶导数表示为差分形式。
例如，电场的二阶导数可以近似为中心差分形式：∂^2E/∂x^2 ≈ (E(i+1,j,k) - 2E(i,j,k) + E(i-1,j,k))/(∆x)^2、这样，就可以将Maxwell方程组中的导数项用离散形式表示，然后将离散的方程用迭代逐步计算的方法求解。
FDTD方法的计算过程可以简要概括为以下几个步骤：首先，需要定义模拟区域的网格大小和时间步长。
然后，在每个时间步长内，计算电场和磁场的分量在各个网格点上的更新。
这个更新过程基于Maxwell方程组的离散形式，通过差分格式计算每个场分量在下一个时间步长的值。
在更新的过程中，还需要考虑介质的性质，比如介电常数和磁导率等。
最后，通过反复迭代，可以得到电磁场在时域中的演化过程。
FDTD方法的优点之一是简单易实现。
由于FDTD方法的数值计算是基于离散差分格式的，因此在编程实现时非常直观和容易理解。
另外，FDTD 方法的计算稳定性较好，能够模拟复杂的电磁场变化。
微纳光子学设计仿真工具-FDTD Solutions 专题资料集锦
Effect of subwavelength annular aperture.pdf
Fabrication and properties of metalo-dielectric photonic crystal.pdf
Educational Software for interference and optical diffraction
SMALL AREA RIGHT ANGLE BENDS.pdf
表面等离子共振技术.pdf
表面等离子体亚波长光学.pdf
李灿光催化综述.pdf
FDTD Solutions初级技术培训（视频）
更多资料：/Home.html
FDTD Solutions 8.0 - New Features(视频)
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fdtd讲座1125
n 2 x
1
设置的边界条件
一维电磁波在介质中传播
n1/2 (k ) E n1/2 (k ) E x x t
r 0 0 x
t
n n 1 [H y (k 1 ) H y (k 2 )] 2
n 1 n 1 Hy (k 1 ) H y (k 2 ) 2
(1.7) (1.8)
式中，时间变量已隐含在迭代公式中, 只要给定了所有空间点上电和磁场的初值，就可以一 步一步地求出任意时刻所有空间点上的电场和磁场值。
一维边界条件
x x t 2 c0 3 c0
稳定性条件
x 距离 c0 t 2
电磁波传播距离
E 0 E
E
H
n 1/2 x
(k ) E
1 2
n 1/2 x
t n n 1 (k ) [H y (k 1 ) H y (k 2 )] 2 0 x
1 2
n 1 y
t n 1/2 n 1/2 (k ) H (k ) [ Ex (k 1) Ex (k )] 0 x
0 0 x
n1/2 (k 1) E n1/2 (k )] [E x x
Ex[k ] Ex[k ] Cb[k ]* Hy[k ] Hy[k 1]
Hy[k ] Hy[k ] 0.5 * Ex[k 1] Ex[k ]
Cb[k ] 0.5 / epsilon
•
•
媒质的非均匀性、各向异性、色散特性和 非线性等均能很容易地进行精确模拟。 • 由于在网格空间中电场和磁场分量是被交 叉放置的，而且计算中用差分代替了微商，使 得介质交界面上的边界条件能自然得到满足， 这就为模拟复杂的结构提供了极大的方便。
微纳光子学设计分析软件FDTD Solutions专题资料集锦(四)
Numerical study of natural convection in porous media (metals) using Lattice Boltzmann Method (LBM).pdf 自然对流多孔介质(金属)用晶格玻尔兹曼方法加快的数值研究 A thermal lattice BGK model with doubled populations is proposed to simulate the two-dimensional natural convection flow in porous
金属/半导体核壳结构电浆子模式研究
The symmetry-broken geometry and variation of metal composition of semishells induce new plasmonic properties. A system of separated
metallic semishells embedded in a poly(dimethylsiloxane) polymer
and porosity on the natural convection are examined. Also the
effect of porous media configuration (shape) on natural convection is investigated. The results showed that the overall heat transfer
structure obtained by spinodal decomposition. Its optical response
was investigated both experimentally and theoretically. Our results show that this structure has interesting optical properties due to the existence of only short-range order and the lack of welldefined local structures.
微纳光子学设计分析软件FDTD Solutions专题资料集锦(一)
FDTD案例-液晶-扭转向列型LCD.rar
FDTD案例-液晶-光电开关.rar
FDTD案例-液晶-SOI环形谐振器的调节.rar
综合性算例：
FDTD案例-偏振光.rar
FDTD案例-角度监视器.rar
FDTD案例-坡印廷矢量.rar
FDTD案例-石墨烯.rar
FDTD案例-能带.rar
FDTD案例-收敛试验.rar
微纳光子学设计分析软件 FDTD Solutions专题资料 集锦(一)
更新时间：2015-1-5
以下是小编整理的一些有关微纳光子学设计分析软件FDTD Solutions专题
资料（一）,其中包括了有关FDTD Solutions相关案例文档及其文档简介、相 关视频资料。有关文档的下载，可以到研发埠网站的专题模块，输入相应的
FDTD案例-太阳能电池表面增强.rar
FDTD案例-双稳态.rar
FDTD案例-天线.rar
FDTD案例-添加表面.rar
FDTD案例-圆偏振光.rar
FDTD案例-相位差.rar
FDTD案例-自输入表面.rar
FDTD案例-远场.rar
FDTD案例-散射.rar
更多资料：/Home.html
FDTD Solutions简介(视频)
FDTD参考手册 Lumerical 2014a安装手册
Lumerical Flexnet code license安装步骤（最新）.pdf
如何成功完成Lumerical注册
算例下载区：
谐振腔相关算例： FDTD案例-谐振腔-光学晶子.rar
FDTD案例-谐振腔-quality_factor.rar
专题名，搜索到相应的专题便可以找到相应的文档，或是到研发埠网站的文
微纳光子学设计分析软件FDTD Solutions专题资料集锦(二)
Broadband negative refraction in stacked fishnet metamaterial.pdf
宽带负折射在渔网材料堆放 We demonstrate a scheme to utilize the stacked fishnet metamaterial for all-angle negative refraction and subwavelength imaging within a wide frequency range starting from zero frequency. The theoretical predictions are verified by the brute-force finitedifference-in-time-domain numerical simulations. The phenomena come from the negative evanescent coupling between the adjacent slab
808nmLD激发下高折射率差光纤锥_硫卤微球耦合系统的荧光回廊模.zip 用熔融淬冷法制备了0.5wt.％掺杂Nd3+:75GeS2－15Ga2S3－0CsI (0.5wt.％ Nd－GGSI)硫卤玻璃。此基础上以玻璃粉料漂浮熔融法制备出粒径为50～
300μ m高折射率（ｎ≈2.1）玻璃微球，并在显微镜下选出表面质量高的硫卤
FDTD介绍
差分格式
❖ 首先，在直角坐标系中将问题空间沿三个坐标轴方向分成多 个网格单元，其中 x , y , z 分别表示在x、y、z坐标方向 的网格空间步长，用Δt表示时间步长。设 f (i,j,k)代表电场或磁 场的,某一分量在时间和空间域中的离散表达式为
f (i,j,k)= f (i x ,j y ,k z )= (i,j,k)
第二十页，编辑于星期四：七点 二十九分。
数值色散和解的稳定性
❖ 由于 FDTD 方程只是原 Maxwell 旋度方程的一种近似，在计 算中存在误差。只有离散后差分方程组的解是收敛和稳定的， 这种代替才有意义。收敛性是指当离散间隔趋于零时，差分方 程的解在空间任意一点和任意时刻都一致趋于原方程的解。稳 定性是指寻求一种离散间隔所满足的条件，在此条件下差分方 程的数值解与原方程的严格解的差为有界。
第十五页，编辑于星期四：七点 二十九分。
差分格式
❖ Yee网格如图2.2所示，主要表示的是电场和磁场在空间各节 点的排布。由图可以看出每个电场的分量周围有四个磁场分量， 相应的每个磁场分量周围也有四个电场分量。这种空间的设置 方式能够实现空间坐标的差分计算，并且考虑到电磁场在空间 互相正交、铰链的关系，也满足了Maxwell方程的积分形式，能 够很好地模拟电磁场传播过程。
❖ 随着当代半导体制作工艺的发展, 电子设备越来越趋向于小 型化和复杂化,其工作环境也日益复杂,同时电磁环境效应问题 变得也越来越重要。虽然在应用电磁数值仿真技术方面做了很 多研究, 但是实际应用的数值方法仍存有挑战性,特别是如何使 用和如何发展现有的电磁场数值技术以适应电大尺寸和多尺度 问题仿真。
第三页，编辑于星期四：七点 二十九分。
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更新时间：2015-2-4
以下是小编整理的一些FDTD Solutions资料集锦,其中包括了有关FDTD
Solutions 应用算例和相关外文文献。有关文档的下载，可以到研发埠 网站的专题模块，输入相应的专题名，搜索到相应的专题便可以找umerical investigation of heat transfer in phase change
materials (PCMs).pdf The effects of metal foams on heat transfer enhancement in Phase Change Materials (PCMs) are investigated.The numerical investigation is based on the two-equation non-equilibrium heat transfer model,in which the coupled heat conduction and natural convection are considered at phase transition and liquid zones. The numerical results are validated by experimental data.
toward achieving high efficiencies in solar cells. Here we propose
a perpendicular elliptical silicon nanowire (PEE-SiNW) array for broadband light absorption in thin film silicon solar cells.
Storage (LTES) system. A phase field model deals with free boundary
problems without tracing their positions, and therefore provides potentials of being extended to consider more complicated mechanisms: multi-dimension and volume change.
Simulation results reveal that light absorption enhancement is
originated from the split of the principal modes as well as the excitation of high order modes caused by the asymmetry of the
精品文献下载：
808nmLD激发下高折射率差光纤锥_硫卤微球耦合系统的荧光回廊模.zip 用熔融淬冷法制备了0.5wt.％掺杂Nd3+:75GeS2－15Ga2S3－0CsI (0.5wt.％ Nd－GGSI)硫卤玻璃。此基础上以玻璃粉料.1）玻璃微球，并在显微镜下选出表面质量高的硫卤
Experimental Investigation of First Hyperpolarizability by a Prism
Coupling Waveguide Method.pdf The complex first hyperpolarizability of chromophore for electrooptic effect has been determined by a prism coupling waveguide method. By measuring the field-induced changes in the reflected intensity of the prism–waveguide coupling system at different guided wave resonance dips,the real and imaginary parts of the first hyperpolarizability of the chromophore are simultaneously obtained without using the Kramers–Kronig transformation.
elliptical nanowires and the enhanced mode coupling between
adjacent elliptical nanowires attained by the appropriate arrangement of nanowires.
更多资料：/Home.html
Broadband absorption enhancement in elliptical silicon nanowire
arrays for photovoltaic applications.pdf Semiconducting nanowire arrays have emerged as a promising route
特性，适合于中红外非线性应用领域。
用于产生超连续谱的硫系光子晶体光纤的色散特性.zip 光子晶体光纤具备的无截止单模、模场面积可调和色散可控的特性，使其在 超连续谱的产生中具有独特的优势。超连续谱的产生条件之一，是所使用的 光纤须具有高的非线性，而硫系玻璃非线性系数极高，因此利用硫系玻璃光 子晶体光纤产生超连续谱的研究备受关注。采用熔融-淬冷法制备 Ge23Sb12S65 硫系玻璃，并以此为基质设计了用于超连续谱产生的高非线性 光子晶体光纤。采用多极法分析光纤孔间距Λ 、孔径比d/Λ 等对光纤的色散
零点位移、色散平坦调控、损耗及模场面积的影响，最终得到当Λ =2 μ m，
d/Λ =0.43 时，可获得2~4 μ m 平坦色散的高非线性光子晶体光纤结构。
相关外文文献：
Analytical considerations of light transport in nanostructured.pdf 纳米的光传输研究分析
polarizers. In order to minimize the influence of the standingwave electric field on the laserinduced damage threshold of the polarizers, a crucial optimization parameter, the maximum
结果与微球腔回音壁模式谐振的理论模型有较高的符合度。
Ge_30_Sb_8Se_62硫系玻璃的制备及其10.6μ ｍ低损耗空芯光子带隙光纤的设 计.zip 硫系玻璃光子晶体光纤在中远红外激光传输领域具有广阔的应用前景。制备
了红外波段具有优良透过特性的 Ge30Sb8Se62硫系玻璃，并以此为基质材料
An effectiveness study of enhanced heat transfer in phase change
materials (PCMs).pdf
A phase field model is for the first time employed to solve the phase change problem in a metal foamembeddedLatent Thermal Energy
Automated method for optimization of electric field
distributions and optical parameters in thin-film polarizers.pdf An efficient method based on the modified needle optimization technique is proposed to design high-power laser thin-film
electric field intensity in the high-refractive-index layers,
is included in the proposed merit function.
Broadband negative refraction in stacked fishnet metamaterial.pdf We demonstrate a scheme to utilize the stacked fishnet metamaterial for all-angle negative refraction and subwavelength imaging within a wide frequency range starting from zero frequency. The theoretical predictions are verified by the brute-force finite-difference-in-timedomain numerical simulations. The phenomena come from the negative evanescent coupling between the adjacent slab waveguides through the breathing air holes perforated on metal layers.
设计了一种适合于高功率中红外激光传输的带隙型光子晶体光纤。利用平面 波展开法和有限元法分析了不同结 构下该光纤的光子带隙、模场面积和限制
损耗特性。通过优化光纤的结构参数，获得了在10.6μ m处限制损耗小于
0.1dB/m的大模场（模场面积大于 100μ m2）光子晶体光纤。
中红外色散平坦硫系光子晶体光纤设计及性能研究.zip 以自制Ge20Sb15Se65 硫系玻璃为基质材料设计，一种正八边形结构色散平坦 型中红外硫系光子晶体光纤，并采用多极法对其中红外色散和传输特性进行 数值研究。结果表明：控制该光纤 占空比(d/Λ ) 在0.323—0.367之间，其 色散及传输特性在3—5m范围内可调。当孔间距Λ = 3.4μ m，孔直径d = 1.1μ m时，光纤在4.1—4.9μ m波段的色散值在-0.8—0.8 psnm-1km-1 波动 ，且具备单模低损耗传输(Loss<0.049dB/m)，小模场面积(Aeff < 8.46 m2)