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Laser-scanning surface plasmon polariton resonance microscopy with multiple photodetectors
Takuo Tanaka1, Sadahiko Yamamoto
1Division of Advanced Electronics and Optical Science, Department of Physical Science, Graduate School of Engineering Science, Osaka University, 1-3 Machikaneyama-cho, Toyonaka, Osaka 560-8531 Japan. tanaka@ee.es.osaka-u.ac.jp
Abstract:
We report the development of a laser-scanning surface plasmon resonance microscope equipped with multiple photodetectors. The system simultaneously obtains images that have different orientations to the specimen under examination, and the system can achieve a spatial resolution of 1.6 microm, which is shorter than the propagation length of the scanning surface plasmons, while high sensitivity to thickness and refractive-index distribution is retained. In addition, because the system uses a laser-scanning microscope, it can obtain high-contrast images. The measurable ranges of refractive-index distributions and thicknesses of specimens that can be measured are also discussed.
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