bend_r 0.5[um] "radius of bent"
Dx bend_r+2*si_in "width domain"
Dy bend_r+2*si_in "height domain"
si_in 2[um] "straight length"
nSi 3.47 "Si index"
nSiO2 1.46 "SiO2 index"
wSi 450[nm] "width of wg"
lam0 "1550 [nm]" wavelength
f0 c_const/lam0 frequency
