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Design of photonic crystal add-drop filters based on quasi-ring cavities

HARKIRANJEET KAUR1,* , RAJINDER SINGH KALER1, BALVEER PAINAM1

Affiliation

  1. Optical Fiber Communication Research Laboratory (OFCR Lab), ECE Department, Thapar University, Patiala 147004, India

Abstract

In this work, we presented add drop filters design with two dimensional square photonic crystal lattice. The filters are based upon multiple quasi-ring cavities inside the square cavity. The theoretical power transmittance spectra are analyzed using Finite-Difference Time-Domain (FDTD) approach for two alternative add-drop filter (ADF) layouts. The drop efficiency of 95% is achieved with one of the filters having perfect backward drop at the wavelength of 1.48 μm. The minimum spectral width attained is 68 nm. The size of this device is 12.4 μm × 12.4 μm. The reflecting cavities designed in these structures find their application in ultra-compact photonic circuits and bio-sensing circuits as multiple cavities can easily trap the bio-molecules within them..

Keywords

Photonic Crystals (PhC), Finite Difference Time Domain (FDTD), Plane Wave Expansion (PWE), Resonating Cavities, Photonic Band gap, Add-drop Filter (ADF).

Citation

HARKIRANJEET KAUR, RAJINDER SINGH KALER, BALVEER PAINAM, Design of photonic crystal add-drop filters based on quasi-ring cavities, Optoelectronics and Advanced Materials - Rapid Communications, 11, 1-2, January-February 2017, pp.23-26 (2017).

Submitted at: July 7, 2015

Accepted at: Feb. 10, 2017