Near field detector for integrated surface plasmon resonance biosensor applications
First Claim
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1. A near-field surface plasmon detector comprising:
- a semiconductor structure that measures one or more surface plasmons of a sample being tested using incoming light being emitted from a light emitting source, the light emitting source is positioned so the light is emitted at an off angle; and
a plurality of electrodes positioned on or near said semiconductor structure, said one of the electrodes comprises one or more electrical contacts used to output electrical power under operation, the one or more surface plasmons being used to provide power to the near-field plasmon detector, the semiconductor structure being sandwiched between the electrodes, wherein the arrangement of the semiconductor structure and the electrodes is a heterojunction diode that converts the evanescent field of the one or more surface plasmons at a liquid aqueous-gold interface into photocurrents.
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Abstract
A near-field surface plasmon detector is provided. The near-field surface plasmon detector includes one or more semiconductor layers that absorb one or more surface plasmons of thin metal films in the vicinity of the semiconductor layer. The surface plasmons are excited by incoming light being emitted from a light emitting source. The metal films are also employed as electrical contacts used to capture photocurrent generated after absorption of surface plasmons by the semiconductor layers.
52 Citations
22 Claims
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1. A near-field surface plasmon detector comprising:
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a semiconductor structure that measures one or more surface plasmons of a sample being tested using incoming light being emitted from a light emitting source, the light emitting source is positioned so the light is emitted at an off angle; and a plurality of electrodes positioned on or near said semiconductor structure, said one of the electrodes comprises one or more electrical contacts used to output electrical power under operation, the one or more surface plasmons being used to provide power to the near-field plasmon detector, the semiconductor structure being sandwiched between the electrodes, wherein the arrangement of the semiconductor structure and the electrodes is a heterojunction diode that converts the evanescent field of the one or more surface plasmons at a liquid aqueous-gold interface into photocurrents. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11)
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12. A method of performing a near-field surface plasmon detection comprising:
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providing a semiconductor structure that measures one or more surface plasmons of a sample being tested using incoming light being emitted from a light emitting source, the light emitting source being positioned so the light is emitted at an off angle; and positioning a plurality of electrodes on or near said semiconductor structure, said one or more electrode comprise one or more electrical contacts used to output electrical power under operation, the one or more surface plasmons being used to provide power to the near-field plasmon detector, the semiconductor structure being sandwiched between the electrodes, wherein the arrangement of the semiconductor structure and the electrodes is a heterojunction diode that converts the evanescent field of the one or more surface plasmons at a liquid aqueous-gold interface into photocurrents. - View Dependent Claims (13, 14, 15, 16, 17, 18, 19, 20, 21, 22)
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Specification