Optical sensor and system

Details Optical sensor and system Optical sensor and system

2006-04-20

2008-03-04

Sanghavi, Hemang (Department: 2874)

Optical waveguides

Optical waveguide sensor

C385S013000, C385S037000

Reexamination Certificate

active

07340119

ABSTRACT:
An optical sensor has a core, a cladding, and an over-layer. In some embodiments the optical sensor also has a sensing layer. The over-layer acts as a sensitivity enhancement layer, with a refractive index larger than that of the cladding layers. A periodic structure, such as a long-period grating (LPG), is formed in the core. A transmission spectrum of the device shows several notches due to the existence of the LPG. A change in the sensing layer's refractive index and/or thickness results in a shift in the notch wavelengths of the LPG. By choosing proper refractive indices and thicknesses of the core, the cladding and the over-layer, the shift in the notch wavelengths can be significantly enhanced.

REFERENCES:
patent: 6965708 (2005-11-01), Luo et al.
patent: 7068868 (2006-06-01), Pi et al.
patent: 2005/0002606 (2005-01-01), James et al.
patent: 2007/0025661 (2007-02-01), Wang et al.
Ignacio Del Villar, et al.; Optimization of Sensitivity in Long Period Fiber Gratings With Overlay Deposition: Optics Express, vol. 13, No. 1, Jan. 10, 2005, pp. 56-69.

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