Highly sensitive refractive index sensors

Jian Jim Wang

doi:10.1117/12.735842

25 September 2007 Highly sensitive refractive index sensors

Jian Jim Wang

Proceedings Volume 6766, Optoelectronic Devices: Physics, Fabrication, and Application IV; 676607 (2007) https://doi.org/10.1117/12.735842
Event: Optics East, 2007, Boston, MA, United States

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.

Citation Download Citation

Jian Jim Wang "Highly sensitive refractive index sensors", Proc. SPIE 6766, Optoelectronic Devices: Physics, Fabrication, and Application IV, 676607 (25 September 2007); https://doi.org/10.1117/12.735842

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