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Optical measurements of properties in substances using propagation modes of light

  • US 9,134,231 B2
  • Filed: 10/08/2013
  • Issued: 09/15/2015
  • Est. Priority Date: 06/04/2003
  • Status: Active Grant
First Claim
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1. A method for optically measuring a sample, comprising:

  • directing one beam of guided light in a first propagation mode to a sample;

    directing a first portion of the guided light in the first propagation mode at a location near the sample away from the sample before the first portion reaches the sample while allowing a second portion in the first propagation mode to reach the sample;

    controlling a reflection of the second portion from the sample to be in a second propagation mode different from the first propagation mode to produce a reflected second portion; and

    directing both the reflected first portion in the first propagation mode and the reflected second portion in the second propagation mode through a common waveguide into a detection module to extract information from the reflected second portion on the sample.

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