Radiant energy – Radiant energy generation and sources
Patent
1988-10-06
1989-10-17
Fields, Carolyn E.
Radiant energy
Radiant energy generation and sources
2504951, 250504R, 372 4, 372 44, 372 20, 357 17, 357 231, H01S 319
Patent
active
048749532
ABSTRACT:
Tunable far infrared radiation is produced from two-dimensional plasmons in a heterostructure, which provides large inversion-layer electron densities at the heterointerface, without the need for a metallic grating to couple out the radiation. Instead, a light interference pattern is produced on the planar surface of the heterostructure using two coherent laser beams of a wavelength selected to be strongly absorbed by the heterostructure in order to penetrate through the inversion layer. The wavelength of the far infrared radiation coupled out can then be readily tuned by varying the angle between the coherent beams, or varying the wavelength of the two interfering coherent beams, thus varying the periodicity of the photoconductivity grating to vary the wavelength of the far infrared radiation being coupled out.
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California Institute of Technology
Fields Carolyn E.
Miller John A.
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