new example: plane wave with metamaterial

matlab/examples/Metamaterial_PlaneWave_Drude.m

@@ -0,0 +1,130 @@
+%%%%%%%%%%%%%%%%%%%%%%%
+% example demonstrating double drude meta-material
+%
+% author: Thorsten Liebig @ 2010
+%%%%%%%%%%%%%%%%%%%%%%%
+
+close all
+clear
+clc
+
+%% setup the simulation %%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%
+postproc_only = 0;      %set to 1 if the simulation is already done
+
+Settings = [];
+Settings.LogFile = 'openEMS.log';
+
+pic_size = round([1400 1400/4]); %define the animation picture size
+
+%simulation domain setup (in mm)
+length = 4000;
+width = 100;    
+mesh_res = 5;        % mesh resolution
+height = 3*mesh_res; % hight is ony 3 lines with PEC (top/bottom) --> quasi 2D
+
+%FDTD setup
+f0 = 0.5e9;         %center frequency
+f_BW = f0/sqrt(2);  %bandwidth
+MTM.f0 = f0;        %plasma frequency of the drude material
+MTM.length = 1000;  %length of the metamaterial
+N_TS = 5e4;         %number of timesteps
+endCriteria = 1e-5; %stop simulation if signal is at -50dB
+
+%constants
+EPS0 = 8.85418781762e-12;
+MUE0 = 1.256637062e-6;
+
+%% define openEMS options %%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%
+openEMS_opts = '';
+% openEMS_opts = [openEMS_opts ' --disable-dumps'];
+openEMS_opts = [openEMS_opts ' --engine=fastest'];
+
+Sim_Path = 'MTM_PW_Drude';
+Sim_CSX = 'MTM_PW_Drude.xml';
+
+if (postproc_only==0)
+    
+    if (exist(Sim_Path,'dir'))
+        rmdir(Sim_Path,'s');
+    end
+    mkdir(Sim_Path);
+
+    %% setup FDTD parameter & excitation function %%%%%%%%%%%%%%%%%%%%%%%%%%%%%
+    FDTD = InitFDTD(N_TS,endCriteria,'OverSampling',10);
+    FDTD = SetGaussExcite(FDTD,f0,f0/sqrt(2));
+    % FDTD = SetSinusExcite(FDTD,f0*sqrt(2));
+    BC = [1 1 0 0 2 2];
+    FDTD = SetBoundaryCond(FDTD,BC);
+
+    %% setup CSXCAD geometry & mesh %%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%
+    CSX = InitCSX();
+    mesh.x = -width/2 : mesh_res : width/2;
+    mesh.y = -height/2 : mesh_res : height/2;
+    mesh.z = -length/2 : mesh_res : length/2;
+    CSX = DefineRectGrid(CSX, 1e-3,mesh);
+
+    %% apply the plane wave excitation %%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%
+    start=[-width/2 -height/2 ,mesh.z(3)];
+    stop=[width/2 height/2 mesh.z(3)];
+    CSX = AddExcitation(CSX,'excite',0,[0 1 0]); % excite E_y
+    CSX = AddBox(CSX,'excite',0 ,start,stop);
+
+    %% apply drude material %%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%
+    CSX = AddProperty(CSX,'LorentzMaterial','drude');
+    CSX = SetPropertyArgs(CSX,'LorentzMaterial','drude','PlasmaFrequency','Epsilon',MTM.f0);
+    CSX = SetPropertyArgs(CSX,'LorentzMaterial','drude','PlasmaFrequency','Mue'    ,MTM.f0);
+    start=[mesh.x(1)   mesh.y(1)   -MTM.length/2];
+    stop =[mesh.x(end) mesh.y(end)  MTM.length/2];
+    CSX = AddBox(CSX,'drude', 10 ,start,stop);
+
+    %% define dump boxes... %%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%
+    CSX = AddDump(CSX,'Et','FileType',1,'SubSampling','10,10,1');
+    start = [mesh.x(2) ,0 , mesh.z(1)];
+    stop = [mesh.x(end-1) , 0 , mesh.z(end)];
+    CSX = AddBox(CSX,'Et',0 , start,stop);
+
+    %% Write openEMS compatoble xml-file %%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%
+    WriteOpenEMS([Sim_Path '/' Sim_CSX],FDTD,CSX);
+
+    %% run openEMS %%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%
+    RunOpenEMS(Sim_Path, Sim_CSX, openEMS_opts, Settings);
+
+end
+
+%% plot E-fields
+freq = [f0/sqrt(2) f0 f0*sqrt(2)];
+field = ReadHDF5FieldData([Sim_Path '/Et.h5']);
+mesh_h5 = ReadHDF5Mesh([Sim_Path '/Et.h5']);
+
+ET = ReadUI('et',Sim_Path);
+ef = DFT_time2freq(ET.TD{1}.t,ET.TD{1}.val,freq);
+
+field_FD = GetField_TD2FD(field, freq);
+
+mesh.x = linspace(-500,500,numel(mesh_h5.lines{1})); %make animation wider...
+mesh.y = mesh_h5.lines{2};
+mesh.z = mesh_h5.lines{3};
+
+[X Z] = meshgrid(mesh.x,mesh.z);
+X = X';
+Z = Z';
+
+for n=1:numel(field_FD.values)
+    Ec{n} = squeeze(field_FD.values{n}/ef(n));
+end
+
+%%
+figure('Position',[10 100 pic_size(1) pic_size(2)]);
+phase = linspace(0,2*pi,21);
+disp('press CTRL+C to stop animation');
+while (1)
+    for ph = phase(1:end-1)
+        for n=1:numel(Ec)
+            subplot(1,numel(Ec),n)
+            E = real(Ec{n}.*exp(1j*ph));
+            surf(X,Z,E(:,:,2));
+            title(['f_0 = ' num2str(freq(n)*1e-9) ' GHz'])
+        end
+        pause(0.1);
+    end
+end