Fiber optic apparatus for detecting molecular species by surface enhanced Raman spectroscopy
- Livermore, CA
- Honolulu, HI
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.
- Research Organization:
- Lawrence Livermore National Laboratory (LLNL), Livermore, CA (United States)
- DOE Contract Number:
- W-7405-ENG-48
- Assignee:
- United States of America as represented by United States (Washington, DC)
- Patent Number(s):
- US 4781458
- OSTI ID:
- 866758
- Country of Publication:
- United States
- Language:
- English
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Related Subjects
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
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