Design of a Narrow Band Filter Based on a Photonic Crystal Cavity for CO 2 Sensing Application.
- Resource Type
- Academic Journal
- Authors
- Jannesari R; Institute for Microelectronics and Microsensors, Johannes Kepler University, 4040 Linz, Austria.; Grille T; Infineon Technologies Austria AG, 9520 Villach, Austria.; Stocker G; Infineon Technologies Austria AG, 9520 Villach, Austria.; Jakoby B; Institute for Microelectronics and Microsensors, Johannes Kepler University, 4040 Linz, Austria.
- Source
- Publisher: MDPI Country of Publication: Switzerland NLM ID: 101204366 Publication Model: Electronic Cited Medium: Internet ISSN: 1424-8220 (Electronic) Linking ISSN: 14248220 NLM ISO Abbreviation: Sensors (Basel) Subsets: PubMed not MEDLINE; MEDLINE
- Subject
- Language
- English
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.