Apparatus For Enhancing Scattered Light Detection By Re-Directing Scattered Light Outside The Angular Range Of Collection Optics Back To The Sample And Method Of Fabricating Same
First Claim
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1. An optical window for re-directing scattered radiation, the optical window comprising:
- a first surface in proximity to a sample, the first surface substantially transparent to radiation transmitted to and emitted from an emission point of the sample;
a second surface distal from the sample, the second surface reflecting radiation emitted from the emission point at a first angle with respect to a normal of the first surface, the first angle being outside an angular range of a collection optics; and
a third surface, adjacent to the first and second surfaces, the third surface reflecting the radiation reflected from the second surface at a second angle substantially normal to the third surface, wherein the radiation reflected from the third surface is transmitted to the second surface and is reflected from the second surface substantially back toward the emission point.
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Abstract
An apparatus comprising an optical window transmits both an excitation beam to a sample and scattered light from the sample which is within the angular range of the collection optics. Scattered light from the sample outside the angular range of the collection optics is re-directed back to the sample by reflection from one or more surfaces of the apparatus. As a result, the magnitude of scattered light collected is increased.
9 Citations
24 Claims
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1. An optical window for re-directing scattered radiation, the optical window comprising:
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a first surface in proximity to a sample, the first surface substantially transparent to radiation transmitted to and emitted from an emission point of the sample; a second surface distal from the sample, the second surface reflecting radiation emitted from the emission point at a first angle with respect to a normal of the first surface, the first angle being outside an angular range of a collection optics; and a third surface, adjacent to the first and second surfaces, the third surface reflecting the radiation reflected from the second surface at a second angle substantially normal to the third surface, wherein the radiation reflected from the third surface is transmitted to the second surface and is reflected from the second surface substantially back toward the emission point. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14, 15, 16, 17, 18, 19)
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20. A method for fabricating an optical window for re-directing scattered radiation, the method comprising:
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grinding a first surface of a sphere; polishing the first surface such that the first surface is substantially transparent to radiation incident to and emitted from an emission point of a sample in proximity to the first surface; grinding a second surface of the sphere; polishing the second surface such that the second surface reflects radiation emitted from the emission point at a first angle with respect to a normal of the first surface, the first angle being outside an angular range of a collection optics; and polishing a third surface of the sphere adjacent to the first and second surfaces such that the third surface reflects the radiation reflected from the second surface at a second angle substantially normal to the third surface, wherein the radiation reflected from the third surface is transmitted to the second surface and is reflected from the second surface substantially back toward the emission point.
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21. An optical window for re-directing scattered radiation, the optical window comprising:
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a first surface in proximity to a sample, the first surface substantially transparent to radiation transmitted to and emitted from an emission point of the sample; and a second surface distal from the sample, the second surface reflecting radiation emitted from the emission point at a first angle with respect to a normal of the first surface, the first angle being outside an angular range of a collection optics, the second surface reflecting the radiation at a second angle substantially normal to the second surface, wherein the radiation is reflected substantially back toward the emission point, and wherein the second surface substantially spherical about the emission point. - View Dependent Claims (22, 23, 24)
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Specification