Comparison of the sensitivity of air and dielectric modes in photonic crystal slab sensors

Snjezana Tomljenovic-Hanic*, Adel Rahmani, M. J. Steel, C. De Martijn Sterke

*Corresponding author for this work

Research output: Contribution to journalArticle

15 Citations (Scopus)
8 Downloads (Pure)

Abstract

Optical cavities provide a route to sensing through the shift of the optical resonant peak. However, effective sensing with optical cavities requires the optimization of the modal quality factor, Q, and the field overlap with the sample, f. For a photonic crystal slab (PCS) this figure of merit, M =fQ, involves two competing effects. The air modes usually have large f but small Q, whereas the dielectric modes have high-Q and small f. We compare the sensitivity of air and dielectric modes for different PCS cavity designs and account for loss associated with absorption by the sensed sample or its host liquid. We find that optimizing Q at the expense f is the most beneficial strategy, and modes deriving from the dielectric bands are thus preferred.

Original languageEnglish
Pages (from-to)14552-14557
Number of pages6
JournalOptics Express
Volume17
Issue number17
DOIs
Publication statusPublished - 17 Aug 2009

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