131 lines
4.0 KiB
Matlab
131 lines
4.0 KiB
Matlab
%%%%%%%%%%%%%%%%%%%%%%%
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% example demonstrating double drude meta-material
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%
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% author: Thorsten Liebig @ 2010
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%%%%%%%%%%%%%%%%%%%%%%%
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close all
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clear
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clc
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%% setup the simulation %%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%
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postproc_only = 0; %set to 1 if the simulation is already done
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Settings = [];
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Settings.LogFile = 'openEMS.log';
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pic_size = round([1400 1400/4]); %define the animation picture size
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%simulation domain setup (in mm)
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length = 4000;
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width = 100;
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mesh_res = 5; % mesh resolution
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height = 3*mesh_res; % hight is ony 3 lines with PEC (top/bottom) --> quasi 2D
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%FDTD setup
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f0 = 0.5e9; %center frequency
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f_BW = f0/sqrt(2); %bandwidth
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MTM.f0 = f0; %plasma frequency of the drude material
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MTM.length = 1000; %length of the metamaterial
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N_TS = 5e4; %number of timesteps
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endCriteria = 1e-5; %stop simulation if signal is at -50dB
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%constants
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EPS0 = 8.85418781762e-12;
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MUE0 = 1.256637062e-6;
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%% define openEMS options %%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%
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openEMS_opts = '';
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% openEMS_opts = [openEMS_opts ' --disable-dumps'];
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openEMS_opts = [openEMS_opts ' --engine=fastest'];
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Sim_Path = 'MTM_PW_Drude';
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Sim_CSX = 'MTM_PW_Drude.xml';
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if (postproc_only==0)
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if (exist(Sim_Path,'dir'))
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rmdir(Sim_Path,'s');
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end
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mkdir(Sim_Path);
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%% setup FDTD parameter & excitation function %%%%%%%%%%%%%%%%%%%%%%%%%%%%%
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FDTD = InitFDTD(N_TS,endCriteria,'OverSampling',10);
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FDTD = SetGaussExcite(FDTD,f0,f0/sqrt(2));
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% FDTD = SetSinusExcite(FDTD,f0*sqrt(2));
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BC = [1 1 0 0 2 2];
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FDTD = SetBoundaryCond(FDTD,BC);
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%% setup CSXCAD geometry & mesh %%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%
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CSX = InitCSX();
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mesh.x = -width/2 : mesh_res : width/2;
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mesh.y = -height/2 : mesh_res : height/2;
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mesh.z = -length/2 : mesh_res : length/2;
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CSX = DefineRectGrid(CSX, 1e-3,mesh);
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%% apply the plane wave excitation %%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%
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start=[-width/2 -height/2 ,mesh.z(3)];
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stop=[width/2 height/2 mesh.z(3)];
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CSX = AddExcitation(CSX,'excite',0,[0 1 0]); % excite E_y
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CSX = AddBox(CSX,'excite',0 ,start,stop);
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%% apply drude material %%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%
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CSX = AddProperty(CSX,'LorentzMaterial','drude');
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CSX = SetPropertyArgs(CSX,'LorentzMaterial','drude','PlasmaFrequency','Epsilon',MTM.f0);
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CSX = SetPropertyArgs(CSX,'LorentzMaterial','drude','PlasmaFrequency','Mue' ,MTM.f0);
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start=[mesh.x(1) mesh.y(1) -MTM.length/2];
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stop =[mesh.x(end) mesh.y(end) MTM.length/2];
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CSX = AddBox(CSX,'drude', 10 ,start,stop);
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%% define dump boxes... %%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%
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CSX = AddDump(CSX,'Et','FileType',1,'SubSampling','10,10,1');
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start = [mesh.x(2) ,0 , mesh.z(1)];
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stop = [mesh.x(end-1) , 0 , mesh.z(end)];
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CSX = AddBox(CSX,'Et',0 , start,stop);
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%% Write openEMS compatoble xml-file %%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%
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WriteOpenEMS([Sim_Path '/' Sim_CSX],FDTD,CSX);
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%% run openEMS %%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%
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RunOpenEMS(Sim_Path, Sim_CSX, openEMS_opts, Settings);
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end
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%% plot E-fields
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freq = [f0/sqrt(2) f0 f0*sqrt(2)];
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field = ReadHDF5FieldData([Sim_Path '/Et.h5']);
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mesh_h5 = ReadHDF5Mesh([Sim_Path '/Et.h5']);
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ET = ReadUI('et',Sim_Path);
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ef = DFT_time2freq(ET.TD{1}.t,ET.TD{1}.val,freq);
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field_FD = GetField_TD2FD(field, freq);
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mesh.x = linspace(-500,500,numel(mesh_h5.lines{1})); %make animation wider...
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mesh.y = mesh_h5.lines{2};
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mesh.z = mesh_h5.lines{3};
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[X Z] = meshgrid(mesh.x,mesh.z);
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X = X';
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Z = Z';
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for n=1:numel(field_FD.values)
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Ec{n} = squeeze(field_FD.values{n}/ef(n));
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end
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%%
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figure('Position',[10 100 pic_size(1) pic_size(2)]);
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phase = linspace(0,2*pi,21);
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disp('press CTRL+C to stop animation');
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while (1)
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for ph = phase(1:end-1)
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for n=1:numel(Ec)
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subplot(1,numel(Ec),n)
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E = real(Ec{n}.*exp(1j*ph));
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surf(X,Z,E(:,:,2));
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title(['f_0 = ' num2str(freq(n)*1e-9) ' GHz'])
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end
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pause(0.1);
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end
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end
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