Chemical sensor using Bragg grating-based optical ridge waveguide with polydimethysiloxane as top layer

Xiaoli Dai; Stephen J. Mihailov; Chantal Blanchetiere

doi:10.1117/12.818198

27 April 2009 Chemical sensor using Bragg grating-based optical ridge waveguide with polydimethysiloxane as top layer

Xiaoli Dai, Stephen J. Mihailov, Chantal Blanchetiere

Proceedings Volume 7316, Fiber Optic Sensors and Applications VI; 73160G (2009) https://doi.org/10.1117/12.818198
Event: SPIE Defense, Security, and Sensing, 2009, Orlando, Florida, United States

Abstract

The polymer polydimethylsiloxane (PDMS), which is used as a cladding layer in waveguide-based optical components, is sensitive to some organic compounds. Absorption of organic compounds by PDMS results in changes to the polymer's refractive index and absorption spectrum. In this work, a compact and highly sensitive organic compound sensor based on an evanescent coupling of a Bragg grating ridge waveguide into a PDMS top cladding layer is proposed. The sensor is an open-top Ge-doped SiO₂ ridge waveguide possessing a photoinduced Bragg grating in the waveguide core that has a cladding overlayer of PDMS. When an analyte is applied to the top of the waveguide, changes to the refractive index and absorption of the PDMS layer result in shifts to the Bragg resonance of the core grating. The birefringence, and temperature sensitivity of the sensor are examined.

Citation Download Citation

Xiaoli Dai, Stephen J. Mihailov, and Chantal Blanchetiere "Chemical sensor using Bragg grating-based optical ridge waveguide with polydimethysiloxane as top layer", Proc. SPIE 7316, Fiber Optic Sensors and Applications VI, 73160G (27 April 2009); https://doi.org/10.1117/12.818198

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KEYWORDS

Waveguides

Fiber Bragg gratings

Refractive index

Sensors

Polymers

Silica

Absorption

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