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Refractive Index Measurement within a Photonic Crystal Fibre Based on Short Wavelength Diffraction
Sensors 2007, 7(11), 2741-2749; doi:10.3390/s7112741

Ammonia Optical Sensing by Microring Resonators

1,* , 1 and 2
1 Photonics Research Group, Dipartimento di Elettrotecnica ed Elettronica, Politecnico di Bari, via Edoardo Orabona n. 4, 70125 Bari, Italy 2 Photonics Research Group, Dipartimento di Ingegneria dell’Ambiente e per lo Sviluppo Sostenibile, Politecnico di Bari, viale del Turismo n. 8, 74100 Taranto, Italy
* Author to whom correspondence should be addressed.
Received: 22 October 2007 / Accepted: 14 November 2007 / Published: 15 November 2007
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A very compact (device area around 40 μm2) optical ammonia sensor based on amicroring resonator is presented in this work. Silicon-on-insulator technology is used insensor design and a dye doped polymer is adopted as sensing material. The sensor exhibitsa very good linearity and a minimum detectable refractive index shift of sensing materialas low as 8x10-5, with a detection limit around 4 ‰.
Keywords: Integrated optics; Optical sensor; Ring resonator; Ammonia sensor Integrated optics; Optical sensor; Ring resonator; Ammonia sensor
This is an open access article distributed under the Creative Commons Attribution License (CC BY 3.0).

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Passaro, V.M.N.; Dell’Olio, F.; De Leonardis, F. Ammonia Optical Sensing by Microring Resonators. Sensors 2007, 7, 2741-2749.

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