Sensitive and selective chemical sensor with nanostructured surfaces
First Claim
1. A chemical sensor comprising an optical resonator including a nanostructured surface comprising a plurality of nanoparticles bound to at least one surface of the resonator.
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Abstract
A chemical sensor is provided which includes an optical resonator including a nanostructured surface comprising a plurality of nanoparticles bound to one or more surfaces of the resonator. The nanoparticles provide optical absorption and the sensor further comprises a detector for detecting the optical absorption of the nanoparticles or their environment. In particular, a selective chemical interaction is provided which modifies the optical absorption of the nanoparticles or their environment, and an analyte is detected based on the modified optical absorption. A light pulse is generated which enters the resonator to interrogate the modified optical absorption and the exiting light pulse is detected by the detector.
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Citations
20 Claims
- 1. A chemical sensor comprising an optical resonator including a nanostructured surface comprising a plurality of nanoparticles bound to at least one surface of the resonator.
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14. A chemical sensor comprising a resonator providing intracavity total internal reflection and comprising first and second opposed planar coated facets and a further convex facet acting as a total internal reflection surface;
- a light source for producing a light pulse which enters through said first coated surface and exits through said second coated surface;
a plurality of nanoparticles covalently attached to said convex surface so as to absorb an evanescent field produced by said convex surface.
- a light source for producing a light pulse which enters through said first coated surface and exits through said second coated surface;
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17. A chemical sensor comprising a resonator defining a cavity, a light source for generating light which enters said cavity, said resonator providing intracavity total internal reflection of said light, and including at least one surface having a plurality of nanoparticles bound thereto such that the optical absorption of one of (i) at least one of the nanoparticles and (ii) the environment of the nanoparticles is modified in response to a selective chemical interaction, said sensor further comprising means for detecting an analyte based on the modified optical absorption.
Specification