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Title: Fiber optic apparatus for detecting molecular species by surface enhanced Raman spectroscopy

Abstract

Optrode apparatus for detecting constituents of a fluid medium includes an optical fiber (13, 13a to 13e) having a metal coating (22, 22a to 22e) on at least a portion of a light transmissive core (17, 17a to 17d). The metal is one, such as silver, gold or copper, which enhances emission of Raman signal frequencies by molecules adsorbed on the surface of the coating when monochromatic probe light of a different frequency is scattered by such molecules and the metal coating is sufficiently thin to transmit light between the absorbed molecules and the core of the fiber. Probe light is directed into one end of the fiber and a detector (16, 16d, 16e) analyzes light emitted from the fiber for Raman frequencies that identify one or more particular molecular species. In one form, the optrode (13e) may function as a working electrode of an electrochemical cell (53) while also serving to detect the products of oxidation or reduction reactions which occur at the electrode surface.

Inventors:
 [1];  [2]
  1. (Livermore, CA)
  2. (Honolulu, HI)
Issue Date:
Research Org.:
Lawrence Livermore National Lab. (LLNL), Livermore, CA (United States)
OSTI Identifier:
866758
Patent Number(s):
4781458
Assignee:
United States of America as represented by United States (Washington, DC) LLNL
DOE Contract Number:  
W-7405-ENG-48
Resource Type:
Patent
Country of Publication:
United States
Language:
English
Subject:
fiber; optic; apparatus; detecting; molecular; species; surface; enhanced; raman; spectroscopy; optrode; constituents; fluid; medium; optical; 13; 13a; 13e; metal; coating; 22; 22a; 22e; portion; light; transmissive; core; 17; 17a; 17d; silver; gold; copper; enhances; emission; signal; frequencies; molecules; adsorbed; monochromatic; probe; frequency; scattered; sufficiently; transmit; absorbed; directed; detector; 16; 16d; 16e; analyzes; emitted; identify; particular; form; function; electrode; electrochemical; cell; 53; serving; detect; products; oxidation; reduction; reactions; occur; reduction reactions; molecular species; fiber optic; electrochemical cell; optical fiber; metal coating; light emitted; electrode surface; fluid medium; enhanced raman; reduction reaction; surface enhanced; raman spectroscopy; light transmissive; transmit light; probe light; raman signal; molecular specie; optic apparatus; /356/

Citation Formats

Angel, Stanley M., and Sharma, Shiv K. Fiber optic apparatus for detecting molecular species by surface enhanced Raman spectroscopy. United States: N. p., 1988. Web.
Angel, Stanley M., & Sharma, Shiv K. Fiber optic apparatus for detecting molecular species by surface enhanced Raman spectroscopy. United States.
Angel, Stanley M., and Sharma, Shiv K. Fri . "Fiber optic apparatus for detecting molecular species by surface enhanced Raman spectroscopy". United States. https://www.osti.gov/servlets/purl/866758.
@article{osti_866758,
title = {Fiber optic apparatus for detecting molecular species by surface enhanced Raman spectroscopy},
author = {Angel, Stanley M. and Sharma, Shiv K.},
abstractNote = {Optrode apparatus for detecting constituents of a fluid medium includes an optical fiber (13, 13a to 13e) having a metal coating (22, 22a to 22e) on at least a portion of a light transmissive core (17, 17a to 17d). The metal is one, such as silver, gold or copper, which enhances emission of Raman signal frequencies by molecules adsorbed on the surface of the coating when monochromatic probe light of a different frequency is scattered by such molecules and the metal coating is sufficiently thin to transmit light between the absorbed molecules and the core of the fiber. Probe light is directed into one end of the fiber and a detector (16, 16d, 16e) analyzes light emitted from the fiber for Raman frequencies that identify one or more particular molecular species. In one form, the optrode (13e) may function as a working electrode of an electrochemical cell (53) while also serving to detect the products of oxidation or reduction reactions which occur at the electrode surface.},
doi = {},
journal = {},
number = ,
volume = ,
place = {United States},
year = {1988},
month = {1}
}

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