HIGH-EXTINCTION-RATIO AND POLARIZATION-INDEPENDENT OPTICAL SWITCH BASED ON PHOTONIC CRYSTAL SLABS

摘要

A high-extinction-ratio and polarization-independent optical switch based on photonic crystal slabs comprises an upper photonic crystal slab and a lower photonic crystal slab that are connected to form a unity. The upper photonic crystal slab is a first tetragonal lattice photonic crystal slab, and the unit cell of the first tetragonal lattice photonic crystal slab consists of a high-refraction-index rotary square rod, one first-slab dielectric rod and a background dielectric. The first-slab dielectric rod consists of a high-refraction-index dielectric tube and a low-refraction-index dielectric therein, or consists of a high-refraction-index slab film, or consists of a low-refraction-index dielectric. The lower photonic crystal slab is a second tetragonal lattice photonic crystal slab with a complete band gap, and the unit cell of the second tetragonal lattice photonic crystal slab consists of a high-refraction-index rotary square rod, one high-refraction-index second-slab dielectric rod and a low-refraction-index background dielectric. The frequency of the optical switch ranges from 0.41 to 0.4167.