US Patent 7340119 Optical sensor and system
Patent 7340119 was granted and assigned to McMaster University on March, 2008 by the United States Patent and Trademark Office.
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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.
US Patent 07340119 Optical sensor and system US Patent 7340119 Optical sensor and system
US Patent 07340119 Optical sensor and system
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