MATERIALS = {
    "si": {"epsilon": 3.4757**2},
    "sio2": {"epsilon": 1.444**2},
    "sin": {"epsilon": 2.0**2},
    "ge": {"epsilon": 4.2**2},

}
MATERIALS["Si"] = MATERIALS["si"]
MATERIALS["SiO2"] = MATERIALS["sio2"]
MATERIALS["SiN"] = MATERIALS["sin"]
MATERIALS["Ge"] = MATERIALS["ge"]
