Omnidirectional reflector function of two element cascade structure photonic crystal

The reflectance spectra of two element cascade structure photonic crystal was studied using transfer matrix method. It shows that total reflection bandwidth of single block photonic crystal (single stage) increases with the physical thickness of media layer increasing, and the band gap position also appears blue-shift. The total reflection bandwidth is rapidly broadening towards long wave as the photonic crystals composed of cascade structure, and the more number of cascades is, the faster broadening is. With the increase of incident angle, the total reflection bandwidth of two element cascades structure of photonic crystal quickly spread to the short-wave direction and with slow red-shift. The properties and modulation rules of reflection spectrum of two element cascade structure photonic crystal can be designed for new photonic crystal omnidirectional reflector and provide theoretical basis for optical switch device.