Apparatus for depth-selective Raman spectroscopy
DCFirst Claim
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1. A method of measuring sub-surface Raman scattering through a diffusely scattering sample, comprising:
- (a) supplying incident radiation at one or more entry regions on a surface of the sample;
(b) collecting light scattered within the sample, from one or more collection region on the surface, at a plurality of spacings from the one or more entry regions;
(c) detecting, in the collected light, for each spacing, one or more Raman features spectrally related to the incident radiation; and
(d) deriving, from changes in intensities of the one or more Raman features between the different spacings, one or more characteristics of a sub-surface region of the sample.
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Abstract
Apparatus and methods for detecting Raman spectral features non destructively from sub-surface regions of a diffusely scattering sample are disclosed. Incident radiation is supplied at one or more sample surface entry regions, and light is collected from one or more collection regions spaced from the entry regions. Raman features are detected in the collected light, and depth information is derived according to the entry-collection spacings.
49 Citations
54 Claims
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1. A method of measuring sub-surface Raman scattering through a diffusely scattering sample, comprising:
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(a) supplying incident radiation at one or more entry regions on a surface of the sample; (b) collecting light scattered within the sample, from one or more collection region on the surface, at a plurality of spacings from the one or more entry regions; (c) detecting, in the collected light, for each spacing, one or more Raman features spectrally related to the incident radiation; and (d) deriving, from changes in intensities of the one or more Raman features between the different spacings, one or more characteristics of a sub-surface region of the sample. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 48, 49, 52)
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13. A method of measuring a sub-surface Raman spectrum of a diffusely-scattering sample, comprising:
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a) irradiating the sample with a light probe; b) collecting light scattered by the sample; and c) spectrally separating at least a portion of the collected light to detect one or more Raman spectral features, wherein light scattered by the sample is collected from a plurality of spatial locations on the surface of the sample, each spatial location being at a different distance from the point of irradiation, at least a portion of the light collected at each spatial location being separately spectrally dispersed to form a plurality of Raman spectra and wherein the method further includes; d) analysing the plurality of Raman spectra to extract information on the Raman spectrum of a sub-surface region of the sample. - View Dependent Claims (14, 15, 16, 17, 18, 19, 20, 21, 22, 23, 24, 25, 26, 27, 28, 29, 30)
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31. Apparatus for measuring sub-surface Raman scattering through a diffusively scattering sample, comprising:
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a light source arranged to supply incident radiation at one or more entry regions on a surface of the sample; a collector arranged to collect light scattered within the sample, from one or more collection regions on the surface, at a plurality of spacings from the one or more entry regions; a detector arranged to detect, for each spacing, one or more Raman features spectrally related to the incident radiation; and an analyzer adapted to derive, from the intensities of the Raman features at the different spacings, one or more characteristics of a sub-surface region of the sample. - View Dependent Claims (32, 33, 34, 35, 36, 37, 38, 50, 51, 53, 54)
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39. Apparatus for selectively measuring Raman spectra generated at different depths within a diffusely-scattering medium, the apparatus comprising:
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a light source for irradiating a sample with a probe beam; collection optics for collecting light scattered by the sample and passing it to a spectrometer; detection means for detecting light dispersed by the spectrometer, wherein the apparatus is adapted for scattered light to be collected at a plurality of spatial locations on the surface of the sample, each spatial location being at a different distance from the point of irradiation and at least a portion of the light collected at each spatial location being separately spectrally dispersed by the spectrometer to form a plurality of Raman spectra and wherein the apparatus further includes an analyser for identifying features specific to the Raman spectrum of a sub-layer of the sample from the plurality of Raman spectra. - View Dependent Claims (40, 41, 42, 43, 44, 45, 46, 47)
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Specification