Abstract
We have developed a scanning near-field optical microscope with an optically
trapped metallic particle that has a small diameter compared to the wavelength
of visible light. In this microscope we employed spot illumination to enhance
the intensity of light scattered from a probe particle so we could reduce
the diameter of the probe particle to 40 nm. We detected
slight irregularities of the surface of the cover glass near 10-nm depth.
Also, we observed gold colloidal particles on the surface of the cover glass.
© 1997 Optical Society of America
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