| 摘要 |
A high-extinction-ratio TM 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, three first-slab dielectric rods 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 one to three high-refraction-index slab films, 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, three high-refraction-index second-slab dielectric rods and a low-refraction-index background dielectric. The frequency of the TM band gap ranges from 0.405 to 0.457. A high-extinction-ratio TM optical switch can be achieved with such a structure. |
