Radiant energy – Photocells; circuits and apparatus – Optical or pre-photocell system
Patent
1997-03-12
1999-04-13
Allen, Stephone B.
Radiant energy
Photocells; circuits and apparatus
Optical or pre-photocell system
250306, H01J 314
Patent
active
058941223
ABSTRACT:
A high resolution observation apparatus capable of resolving details smaller than the wavelength of a laser beam used for detection includes a probe for scattering evanescent light projected from a sample in response to the incident laser light. The scattered evanescent light is detected by a photodetector located proximate the probe tip. During measurements, the position of the probe is controlled in the Z axis by a fine movement mechanism while being scanned in the XY plane to conduct measurements. The distance between the probe and the sample is maintained constant by use of a Z-axis servo circuit responsive to an output signal of the photodetector for producing a control signal to control the fine movement mechanism to maintain the detected evanescent light constant. A three-dimensional display of an output of the servo circuit is provided.
REFERENCES:
patent: 4947034 (1990-08-01), Wickramasinghe et al.
patent: 5294790 (1994-03-01), Ohta et al.
patent: 5304795 (1994-04-01), Fujihira et al.
Optical Society of America, Optics Letters, vol. 19, No. 3, Feb. 1, 1994, Yasushi Inouye et al., "Near-field Scanning Optical Microscope with a Metallic Probe Tip".
Allen Stephone B.
Seiko Instruments Inc.
LandOfFree
Scanning near field optical microscope does not yet have a rating. At this time, there are no reviews or comments for this patent.
If you have personal experience with Scanning near field optical microscope, we encourage you to share that experience with our LandOfFree.com community. Your opinion is very important and Scanning near field optical microscope will most certainly appreciate the feedback.
Profile ID: LFUS-PAI-O-224132