期刊
APPLIED PHYSICS LETTERS
卷 85, 期 15, 页码 3017-3019出版社
AMER INST PHYSICS
DOI: 10.1063/1.1806273
关键词
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Differential ellipsometric interrogation of surface plasmon (SP) resonances is a technique that gives ultrahigh sensitivity to refractive index changes, and it may provide the basis for chemical and biological sensors. In this study, a liquid crystal polarization modulator has been developed to provide such a differential technique. A refractive index sensitivity of 2x10(-7) refractive index units is demonstrated, which is at least as sensitive as more established SP sensing techniques. The use of a liquid crystal modulator allows for low-voltage signal modulation and also feedback locking to zero. Possibly more important, it leads to pixelization for array sensing and for potential imaging. (C) 2004 American Institute of Physics.
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