Co-axial detection and illumination with shear force dithering i

Details Co-axial detection and illumination with shear force dithering i Co-axial detection and illumination with shear force dithering i

1994-03-24

1996-08-20

Allen, Stephone

Radiant energy

Photocells; circuits and apparatus

Optical or pre-photocell system

250216, 250306, 359368, H01J 314, H01J 516

Patent

active

055481132

ABSTRACT:
A near-field optical microscope is provided having a tip or tapered optical fiber light guide mounted directly in a hole drilled in the center of a microlens which itself is mounted in a piezoelectric tube for dithering. The tip of the tapered fiber is positioned at the front focal point of the lens. Light emanating from the region just about the tip is thus collected and collimated by the lens. A second lens, further down the optical path next focuses the beam into another fiber for transmission to a photon detection and/or spectroscopic apparatus. This second fiber can alternatively be replaced by one or more image processing lenses or a coherent fiber bundle with the light being transmitted to a position sensitive detector to provide a direct image of the tip region. The microscope also includes a shear force dithering apparatus for control of fiber tip to sample distance.

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