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 μm, which is shorter than the propagation length of the scanning surface plasmons, while high sensitivity to thickness and refractive-index distributions 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.
© 2003 Optical Society of America
Original Manuscript: October 30, 2002
Revised Manuscript: April 9, 2003
Published: July 1, 2003
Takuo Tanaka and Sadahiko Yamamoto, "Laser-scanning surface plasmon polariton resonance microscopy with multiple photodetectors," Appl. Opt. 42, 4002-4007 (2003)