Polarized optical emission due to decay or recombination of spin

Details Polarized optical emission due to decay or recombination of spin Polarized optical emission due to decay or recombination of spin

1993-06-29

1999-02-23

Crane, Sara

Active solid-state devices (e.g., transistors, solid-state diode

Incoherent light emitter structure

With reflector, opaque mask, or optical element integral...

257 99, 257424, 257427, H01L 3300

Patent

active

058747494

ABSTRACT:
A device for producing circularly polarized optical emission includes a light emitting semiconductor heterostructure, further including at least one semiconducting layer; a ferromagnetic contact having a magnetic moment, in electrical contact with a layer of the semiconductor heterostructure; and a contact electrically connected to a different region of the semiconductor heterostructure. This light emitting semiconductor heterostructure may be a light emitting diode (LED), or some other structure. The ferromagnetic contact injects spin polarized carriers (electrons or holes) into the semiconducting device, which recombine with their opposing carriers to produce circularly polarized light. A process for producing circularly polarized optical emission includes applying a bias across a light emitting semiconductor heterostructure having a contact with a net magnetic moment, therby injecting spin polarized carriers into the light emitting semiconductor heterostructure.

REFERENCES:
patent: 4823177 (1989-04-01), Prinz et al.
Datta et al., "Electronic analog of the electro-optic modulator", Applied ysics Letters 56 (7) pp. 665-667 (Feb. 12, 1990).
Johnson et al., "Interfacial Charge-Spin Coupling: Injection and Detection of Spin Magnetization in Metals", Physical Rev. Letters 55 (17) pp. 1790-1793 (Oct. 21, 1985).
IBM Tech. Disc, Bull., "Imaging Magnetic Domains on Ferromagnetic Thin Film . . . "vol. 33, No. 11, Apr. 1991, pp 469-472.

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