Short wavelength pass filter having a metal mesh on a semiconduc

Details Short wavelength pass filter having a metal mesh on a semiconduc Short wavelength pass filter having a metal mesh on a semiconduc

1988-06-15

1989-10-03

Bovernick, Rodney B.

Radiant energy

Ionic separation or analysis

Static field-type ion path-bending selecting means

350311, 2505151, G02B 102, G02B 520, H05K 900

Patent

active

048712205

ABSTRACT:
A short pass filter is disclosed which exhibits high transmission in the infrared and/or visible region of the electromagnetic spectrum and which has high rejection in the microwave portion of the spectrum. The filter generally consists of a substrate of semiconducting material, for example, n-type germanium which has been doped with a suitable dopant or grown with impurities to provide a substrate with a known conductivity. A metal mesh is placed either on one or on both surfaces of the substrate, or is buried within the substrate. The combination of the semiconducting material and metal mesh produce a filter which will transmit infrared and/or visible radiation while rejecting microwave radiation through absorption and reflection.

REFERENCES:
Danielewicz, E. J. et al., "Hybrid Output Mirror for Optically Pumped Far Infrared Lasers," Optics Communications, vol. 13, No. 4, Apr., 1975, pp. 366-369 (350/1.7).

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