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Proceedings Paper

Highly sensitive refractive index sensors
Author(s): Jian Jim Wang
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Paper Abstract

A chemical and biological sensor based on a free-space waveguide resonant grating optical filter has been developed. Different from the conventional surface plasmon resonance sensors and the conventional waveguide mode sensors, which require either prism coupling or grating coupling, the proposed free-space optical sensor device does not require special separate coupling. The inherent 100% coupling efficiency at resonance can significantly boost probe efficiency. Both simulation and experimental results have demonstrated that the new sensor could deliver a resolution of better than 0.001 to 0.0001 for refractive index sensing, which is enough for detecting various chemical and biological materials. More importantly, under an angular detection scheme, the proposed waveguide resonant grating sensor could be one order's more sensitive than the conventional surface plasmon resonance sensor.

Paper Details

Date Published: 25 September 2007
PDF: 8 pages
Proc. SPIE 6766, Optoelectronic Devices: Physics, Fabrication, and Application IV, 676607 (25 September 2007); doi: 10.1117/12.735842
Show Author Affiliations
Jian Jim Wang, NanoNuvo Corp. (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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