Optical waveguides – With optical coupler – Input/output coupler
Patent
1995-10-12
1997-09-02
Healy, Brian
Optical waveguides
With optical coupler
Input/output coupler
385 12, 385 15, 385 39, 385 43, 385123, 385127, 385128, 385901, 250306, 250311, 359368, G02B 626, G02B 2100, G01N 2300
Patent
active
056640366
ABSTRACT:
The near field optical microscopy probe has a conically tapered tip formed from the inner core of a fiber optic cable. The tapered tip protrudes longitudinally from the outer cladding and has a metallized optically opaque coating over all the tip except for the light-emitting aperture at the tip apex. The optical probe is manufactured by wet chemical etching. The protruding conical tip tapers at an acute angle on the order of about 15.degree. to 60.degree., such that the tip length is on the order of a few wavelengths. By this construction, illumination traverses only a very small nonpropagating mode or evanescent mode region with resulting high optical efficiency. The probe and specimen may be supercooled, causing the metallized coating to be highly conductive and therefore optically opaque. The result is a high efficiency, high resolution probe suitable for such demanding applications as DNA sequencing.
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AccuPhotonics, Inc.
Healy Brian
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