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Proceedings Paper

Guided-mode resonance sensor with extended spatial sensitivity
Author(s): David Fattal; Mike Sigalas; Anna L. Pyayt; Zhiyong Li; Raymond G. Beausoleil
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Paper Abstract

We propose a novel design for a guided-mode resonance (GMR) grating sensor that extends the sensitivity to a large region of space, possibly several tens of microns away from the grating surface. This type 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 caused by a "confined" mode of a sub-wavelength thick grating slab, a mode that is largely expelled from the grating itself into the grating environment. The small thickness assumption allows us to derive a simple yet accurate analytical model for the sensor behavior, which is tested numerically using a rigorous coupled-wave analysis (RCWA) method as well as in preliminary grating transmission measurements.

Paper Details

Date Published: 25 September 2007
PDF: 11 pages
Proc. SPIE 6766, Optoelectronic Devices: Physics, Fabrication, and Application IV, 67660J (25 September 2007); doi: 10.1117/12.731942
Show Author Affiliations
David Fattal, Hewlett-Packard Labs. (United States)
Mike Sigalas, Hewlett-Packard Labs. (United States)
Anna L. Pyayt, Hewlett-Packard Labs. (United States)
Univ. of Washington (United States)
Zhiyong Li, Hewlett-Packard Labs. (United States)
Raymond G. Beausoleil, Hewlett-Packard Labs. (United States)

Published in SPIE Proceedings Vol. 6766:
Optoelectronic Devices: Physics, Fabrication, and Application IV
Joachim Piprek; Jian J. Wang, Editor(s)

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