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Optics Express

Optics Express

  • Editor: C. Martijn de Sterke
  • Vol. 17, Iss. 17 — Aug. 17, 2009
  • pp: 14552–14557

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

Snjezana Tomljenovic-Hanic, Adel Rahmani, M. J. Steel, and C. Martijn de Sterke  »View Author Affiliations


Optics Express, Vol. 17, Issue 17, pp. 14552-14557 (2009)
http://dx.doi.org/10.1364/OE.17.014552


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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 of f is the most beneficial strategy, and modes deriving from the dielectric bands are thus preferred.

© 2009 OSA

OCIS Codes
(230.5750) Optical devices : Resonators
(230.5298) Optical devices : Photonic crystals

ToC Category:
Photonic Crystals

History
Original Manuscript: June 16, 2009
Revised Manuscript: July 16, 2009
Manuscript Accepted: July 16, 2009
Published: August 3, 2009

Citation
Snjezana Tomljenovic-Hanic, Adel Rahmani, M. J. Steel, and C. Martijn de Sterke, "Comparison of the sensitivity of air and dielectric modes in photonic crystal slab sensors," Opt. Express 17, 14552-14557 (2009)
http://www.opticsinfobase.org/oe/abstract.cfm?URI=oe-17-17-14552


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