Method and apparatus for controlling propagation of electrical c

Details Method and apparatus for controlling propagation of electrical c Method and apparatus for controlling propagation of electrical c

1996-08-20

1998-08-04

Epps, Georgia Y.

Optical: systems and elements

Optical modulator

Light wave temporal modulation

257222, 257431, G02F 103

Patent

active

057902968

ABSTRACT:
A method and apparatus for generating and controlling the propagation of electrons in a semiconductor material using a plurality of beams of coherent light is disclosed. The direction and magnitude of propagation of the electrons in the semiconductor are controlled by varying the polarization of the coherent beams with respect to the semiconductor material, and in particular the crystallographic axis of the semiconductor material. The electrons are generated and controlled by use of three coherent beams which are related such that the frequency of one of the beams is substantially equal to the sum of the frequencies of the other beams, and the first beam produces substantially the same number of electrons in the semiconductor material that the other beams produce together. A selected region of the semiconductor material is simultaneously irradiated with all of the beams of light. The semiconductor material is at approximately room temperature. Holes are also generated and propagate in a direction opposite to the direction of propagation of the electrons.

REFERENCES:
patent: 4878104 (1989-10-01), Reed et al.
patent: 5101109 (1992-03-01), Jiang et al.
patent: 5214276 (1993-05-01), Himoto et al.
patent: 5459604 (1995-10-01), Corkum et al.
"Coherent Control of Photocurrent Generation in Bulk Semiconductors", Physical Review Letters, vol. 76, No. 10, 4 Mar. 1996, R. Atanasov, A. Hache, J.L.P. Hughes, H.M. van Driel and J.E. Sipe.

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