| 摘要 |
A high-polarization-degree and high-extinction-ratio TE 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 with a TM band gap and a complete band gap, 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 with a TM complete band gap, and the unit cell of the second tetragonal lattice photonic crystal consists of a high-refraction-index rotary square rod, one second-slab dielectric rod and a background dielectric. The frequency of the TE optical switch ranges from 0.453 to 0.458, from 0.503 to 0.509, or from 0.553 to 0.574. |
