Narrow band and angle-insensitive filter based on one-dimensional photonic crystal containing graded-index defect

Abstract

Using finite difference time domain (FDTD) method, we numerically investigate onedimensional photonic crystals (1D PCs) with (AB) m C(BA) m structure, where A and B stand for different dielectric materials, and C the graded-index (GRIN) material. The transmission properties of the multilayer structure have been studied, and the results show that a tunable narrow band-pass filter (BPF) can be obtained by changing gradient coefficients of the GRIN defect layer. For an increasing incident angle, although the transmittance becomes smaller, positions of the resonant peak remain the same, which can act as the angle-insensitive filter.

Temperature tunable Bragg transmission multichannel filters made of two quarter-wave stacks separated by defect layers

“…When a light beam normally impinges on the photonic crystal surface, the wavelengths that fall in the bandgap region of the photonic crystal are strongly reflected with a coefficient of reflection nearly equal to one. Wavelengths below or above the bandgap of the photonic crystal are partially or fully transmitted through the photonic bandgap (PBG) crystal [8][9][10][11][12][13]. The aforementioned PBG crystals exhibit resonance reflection and are often very similar to the secondary interference of x-rays by the atomic planes of the crystal.…”

Modeling of Multichannel Filter Using Defective Nano Photonic Crystal With Thue-Morse Structure

“…A binary PC is a periodic structure including dielectric elements with different refractive indices. There are a lot of researches in using dielectric and metals in PC [4][5][6][7][8][9][10][11][12][13][14][15].…”