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Proceedings Paper

Guided-mode resonance sensor with extended spatial sensitivity
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Paper Abstract

We propose a novel design for a guided-mode resonance (GMR) grating sensor that is optimized for detecting small average index changes in an extended region of space, retaining sensitivity up to several tens of microns away from the grating surface at optical detection frequencies. This kind of sensors has high sensitivity in the half-space above the grating, close to the theoretical limit, together with a controllable - potentially very high - quality factor. It relies on a resonance with a "confined" mode of a sub-wavelength thick grating slab, a mode that is largely expelled from the grating itself. The small thickness assumption allows us to derive analytical expressions for many properties of these sensors, expressions that are then tested numerically using a rigorous coupled-wave analysis (RCWA) method, and in preliminary experiments.

Paper Details

Date Published: 25 September 2007
PDF: 11 pages
Proc. SPIE 6640, Active Photonic Crystals, 66400M (25 September 2007); doi: 10.1117/12.731928
Show Author Affiliations
David Fattal, Hewlett-Packard Labs. (United States)
Mike Sigalas, Hewlett-Packard Labs. (United States)
Anna Pyayt, Hewlett-Packard Labs. (United States)
Zhiyong Li, Hewlett-Packard Labs. (United States)
Raymond G. Beausoleil, Hewlett-Packard Labs. (United States)

Published in SPIE Proceedings Vol. 6640:
Active Photonic Crystals
Sharon M. Weiss; Ganapathi S. Subramania; Florencio Garcia-Santamaria, Editor(s)

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