Design of a Narrow Band Filter Based on a Photonic Crystal Cavity for CO2 Sensing Application

Author:

Jannesari Reyhaneh1ORCID,Grille Thomas2,Stocker Gerald2,Jakoby Bernhard1ORCID

Affiliation:

1. Institute for Microelectronics and Microsensors, Johannes Kepler University, 4040 Linz, Austria

2. Infineon Technologies Austria AG, 9520 Villach, Austria

Abstract

This paper investigates the use of a miniaturized filter based on a triangular lattice of holes in a photonic crystal (PhC) slab. The plane wave expansion method (PWE) and finite-difference time-domain (FDTD) techniques were utilized to analyze the dispersion and transmission spectrum, as well as the quality factor and free spectral range (FSR) of the filter. A 3D simulation has demonstrated that for the designed filter, an FSR of more than 550 nm and a quality factor of 873 can be attained by adiabatically coupling light from a slab waveguide into a PhC waveguide. This work designs a filter structure that is implemented into the waveguide and is suitable for a fully integrated sensor. The small size of the device provides a strong potential for the realization of large arrays of independent filters on a single chip. The fully integrated character of this filter has further advantages such as reducing power loss in coupling light from sources to filters and also from filters to waveguides. The ease of fabrication is another benefit of completely integrating the filter.

Funder

Austrian federal government

University of Linz

Publisher

MDPI AG

Subject

Electrical and Electronic Engineering,Biochemistry,Instrumentation,Atomic and Molecular Physics, and Optics,Analytical Chemistry

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