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US 8,476,007 B2Granted
Optical fiber probe
AssigneeIndian Institute of Technology Bombay
InventorsVemulakonda Venkata Raghavendra Sai, Soumyo Mukherji, Tapanendu Kundu
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Abstract
A biosensor having an optical fiber having at least one curved portion configured to enhance penetration of evanescent waves; and one or more nanoparticles associated with the optical fiber, and configured to enhance localized surface plasmon resonance.
Claims19
A sensor comprising:
- an optical fiber having a probe region having at least one curved portion configured to enhance penetration of evanescent waves;
- and
- one or more nanoparticles in optical communication with the probe region, and configured to enhance localized surface plasmon resonance,
- wherein at least a part of the probe region further comprises at least a first substantially straight portion, coated with nanoparticles, configured for exposure to a sample and a second substantially straight portion configured to avoid exposure to the sample, and
- wherein the at least one curved portion comprises a coiled fiber.
2 more elements
A method of making an optical sensor, the method comprising:
- bending a portion of an optical fiber to form a bent optical fiber having a curved portion, a first substantially straight portion, and a second substantially straight portion;
- forming a coil in the curved portion of the bent optical fiber;
- coating nanoparticles on at least the first substantially straight portion of the bent optical fiber to form a probe region;
- and
- configuring the second substantially straight portion of the bent optical fiber to avoid exposure to the sample.
2 more elements
A sensing system comprising:
- a radiation source to provide radiation;
- an optical fiber to guide the radiation through a sample, the optical fiber comprising a probe region having:
- a first substantially straight portion to be exposed to the sample;
- a curved portion comprising a coiled fiber to enhance penetration of evanescent waves into the sample;
- and
- a second substantially straight portion configured to avoid exposure to the sample;
- one or more nanoparticles, in optical communication with the first substantially straight portion and the curved portion, to enhance localized surface plasmon resonance between the radiation transmitted through the probe region and the sample;
- and
- a spectrometer, in optical communication with the optical fiber, to detect a change in an absorbance spectrum of the radiation transmitted through the probe region due to the localized surface plasmon resonance between the radiation transmitted through the probe region and the sample.
6 more elements
Dependencies are inferred from the claim text.