Design and optimization of two dimensional photonic crystal based optical filter

Abstract

In this paper, the channel drop filter based on two dimensional photonic crystal is proposed. The structure is made of silicon rods with the refractive index n1 = 3.4641 which are perforated in air with refractive index n2 = 1. The simulation results are obtained using 2D finite difference time domain (FDTD) method. The photonic band gap is calculated by plane wave expansion solver method. Resonant mode of the ring resonator and the filter transmission spectrum is calculated using 2D FDTD method. Full width half maximum (FWHM) bandwidth of the filter at the output transmission spectrum from 1.508 μm to 1.512 μm is 4 nm. The quality factor of the filter is 377.5 and the proposed filter design is around 21 × 15 μm which is suitable for photonic integrated circuits.

Design of an Ultra-Compact and Highly-Sensitive Temperature Sensor Using Photonic Crystal Based Single Micro-Ring Resonator and Cascaded Micro-Ring Resonator

“…The number of rods arranged along the X and Y directions are 13 and 13, respectively. The scattering rod is introduced in the structure to improve spectral selectivity as well as the coupling efficiency at four corners of the cavity, as implemented by S. Robinson et al [4]. The coupling length is optimized based on the literature survey and through FDTD based numerical simulation.…”

“…The concepts of photonic crystals were explained by two researchers named E. Yablonovitch and S. John in the year of 1987 [2,3]. Researchers find its many applications in optical filters [4], optical switches [5], logic gates [6], sensors [7,8], etc.…”

Design of high-Q photonic crystal ring resonator incorporating Gaussian distributed inner rods for refractive index sensor

“…Distinctive lattice structures can be patterned in the two-dimensional PhC structure, specifically, square lattice structure, triangular lattice structure, honeycomb lattice structure, etc., by positioning the lattice elements. Several optical devices such as optical filters, 3 multiplexers, 4 optical switches, 5 power splitters, 6 demultiplexers, 7 optical sensors, 8 – 13 etc., using two-dimensional PhCs have been designed for commercial use since 1998. Recently, researchers have proposed different PhC-based bio sensors for the detection of different diseases 14 …”

Fabrication techniques and applications of two-dimensional photonic crystal: history and the present status

“… – 6 Several conspicuous applications are engaged by the PhCs. Some of the applications are light bending, 7 – 9 solar cells, 10 – 13 optical filters, 14 – 17 optical sensors, 18 – 21 and many others. The number of scientific publications on PhC is increasing gradually.…”