绝热锥形与adc psr

switchtolayout;
selectall;
delete;
#定义单位
nm=1e-9;
um=1e-6;addrect;
set("name","sub");
set("material","SiO2 (Glass) - Palik");
set("x min",-10*um);
set("x max",200*um);
set("y",0);
set("y span",40*um);
set("z min",-2*um);
set("z max",0);W0=540*nm;
W1=690*nm;
W2=830*nm;
W3=0.9*um;
W4=0.405*um;
L1=4*um;
L2=44*um;
L3=L1*(W3-W2)/(W1-W0);
Ld=7*um;
g=0.15*um;
hco=220*nm;#input port waveguide
addrect;
set("name","input");
set("material","Si (Silicon) - Palik");
set("x min",-2*um);
set("x max",0);
set("y",0);
set("y span",W0);
set("z min",0);
set("z max",hco);vtx=[L1/2,W1/2;-L1/2,W0/2;-L1/2,-W0/2;L1/2,-W1/2];
addpoly;
set("name","poly2");
set("material","Si (Silicon) - Palik");
set("vertices",vtx);
set("x",L1/2);
set("y",0);
set("z min",0);
set("z max",hco);vtx=[L2/2,W2/2;-L2/2,W1/2;-L2/2,-W1/2;L2/2,-W2/2];
addpoly;
set("name","poly2");
set("material","Si (Silicon) - Palik");
set("vertices",vtx);
set("x",L2/2+L1);
set("y",0);
set("z min",0);
set("z max",hco);vtx=[L3/2,W3/2;-L3/2,W2/2;-L3/2,-W2/2;L3/2,-W3/2];
addpoly;
set("name","poly2");
set("material","Si (Silicon) - Palik");
set("vertices",vtx);
set("x",L3/2+L2+L1);
set("y",0);
set("z min",0);
set("z max",hco);addrect;
set("name","coupling1");
set("material","Si (Silicon) - Palik");
set("x min",L3+L2+L1);
set("x max",L3+L2+L1+Ld);
set("y",0);
set("y span",W3);
set("z min",0);
set("z max",hco);addrect;
set("name","coupling2");
set("material","Si (Silicon) - Palik");
set("x min",L3+L2+L1);
set("x max",L3+L2+L1+Ld);
set("y",W3/2+W4/2+g);
set("y span",W4);
set("z min",0);
set("z max",hco);addring;
set("name","ring waveguide1");
set("material","Si (Silicon) - Palik");
set("x",L3+L2+L1+Ld);
set("y",W3/2+W4/2+g+4*um);
set("z min",0);
set("z max",220*nm);
set("outer radius",4*um+W4/2);#外圆半径
set("inner radius",4*um-W4/2);#内圆半径
set("theta start",-90);#起始角
set("theta stop",0);#终止角addring;
set("name","ring waveguide2");
set("material","Si (Silicon) - Palik");
set("x",L3+L2+L1+Ld+8*um);
set("y",W3/2+W4/2+g+4*um);
set("z min",0);
set("z max",220*nm);
set("outer radius",4*um+W4/2);#外圆半径
set("inner radius",4*um-W4/2);#内圆半径
set("theta start",90);#起始角
set("theta stop",180);#终止角addfdtd;
set("dimension",2);
set("x min",0);
set("x max",65*um);
set("y min",-2*um);
set("y max",10*um);
set("z min",-100*nm);
set("z max",300*nm);addprofile;
set("name","xy");
set("monitor type","2D Z-normal");
set("x min",0);
set("x max",65*um);
set("y",0);
set("y span",10*um);
set("z",110*nm);addprofile;
set("name","yz0");
set("monitor type","2D x-normal");
set("x",0);
set("y",0);
set("y span",4*um);
set("z",110*nm);
set("z span",2*um);addprofile;
set("name","yz1");
set("monitor type","2D x-normal");
set("x",35*um);
set("y",0);
set("y span",4*um);
set("z",110*nm);
set("z span",2*um);addprofile;
set("name","yz2");
set("monitor type","2D x-normal");
set("x",L3+L2+L1+Ld);
set("y",0);
set("y span",10*um);
set("z",110*nm);
set("z span",2*um);addmode;
set("injection axis","x");
set("direction","forward");
set("x",0);
set("y",0);
set("y span",2*um);
set("z",0.1*um);
set("z span",1*um);
set("wavelength start",1.5*um);
set("wavelength stop",1.5*um);

包层条件为Si3N4电场分布图

Daoxin Dai and John E. Bowers, “Novel concept for ultracompact polarization splitter-rotator based on silicon nanowires,” Opt. Express 19, 10940-10949 (2011)

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