Photonic crystal based 2D integrating cell for sensing applications

First published in
Proceedings of SPIE  
Number in series
9885
Article Number
98850X
Citation
Proceedings of SPIE - The International Society for Optical Engineering (9885): 98850X-1-98850X-6 (2016)
Contribution to Conference
Photonic Crystal Materials and Devices XII  
Publisher DOI
10.1117/12.2227849
Scopus ID
2-s2.0-84982298140
Publisher
SPIE
ISBN
978-1-5106-1246-4
978-1-5106-1245-7
We present a concept of a silicon slab based 2D integrating cell where photonic crystal (PhC) reflectors are used in order to confine light in a two-dimensional area to acquire a long propagation length. The evanescent field of the guided wave can be used for sensing applications. We use FDTD simulations to investigate the dependence of the reflectivity of photonic crystal mirrors with a hexagonal lattice. The reflectivity in ΓM direction demonstrates reduced vertical losses compared to the ΓK direction and can be further improved by adiabatically tapering the hole radii of the photonic crystal. A small hexagonal 2D integrating cell was studied with PhC boundaries oriented in ΓM and ΓK direction. It is shown that average reflectivities of 99% can be obtained in a rectangular 2D cell with optimized reflector design, limited only by residual vertical scattering losses at the PhC boundary. This reflectivity is already comparable to the best metallic reflectors.
Subjects
integrated optics
photonic crystal
sensing
silicon photonics
DDC Class
600: Technik