A surface-plasmon-based optical sensor using acousto-optics

The construction of a wavelength-tunable optical sensor with a fixed angle of incidence, incorporating an acousto-optic tunable filter (AOTF) is described. The AOTF is used to control the wavelength of a p-polarized light beam incident on a gold-coated diffraction grating. A surface plasmon resonanc...

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Bibliographic Details
Published in:Measurement science & technology 1995-08, Vol.6 (8), p.1193-1200
Main Authors: Jory, M J, Bradberry, G W, Cann, P S, Sambles, J R
Format: Article
Language:English
Subjects:
Analytical chemistry
Chemistry
Exact sciences and technology
General equipment and techniques
General, instrumentation
Instruments, apparatus, components and techniques common to several branches of physics and astronomy
Physics
Sensors (chemical, optical, electrical, movement, gas, etc.)
remote sensing
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Summary:The construction of a wavelength-tunable optical sensor with a fixed angle of incidence, incorporating an acousto-optic tunable filter (AOTF) is described. The AOTF is used to control the wavelength of a p-polarized light beam incident on a gold-coated diffraction grating. A surface plasmon resonance (SPR) is observed as a deep minimum in the intensity of the reflected beam as the incident wavelength is incremented. The sensitivity of this system was found to be equal to a change in the refractive index of a gas of 1 x 10\+-6\-. A concentration of 0.01 ppm NO\+v\2\-v\ in N\+v\2\-v\ was detected by adding a chemically active overlayer to the system. (Original abstract-amended)
ISSN:0957-0233
1361-6501
DOI:10.1088/0957-0233/6/8/015