Circular polarization spin semiconductor laser using...

Details Circular polarization spin semiconductor laser using... Circular polarization spin semiconductor laser using...

2007-08-07

2007-08-07

Rodriguez, Armando (Department: 2828)

Coherent light generators

Particular active media

Semiconductor

C372S027000

Reexamination Certificate

active

10502542

ABSTRACT:
Disclosed is a spin-based semiconductor laser source capable of generating a completely circularly polarized laser light by injecting current into p-type and n-type half-metal magnetic semiconductor layers. Each of the p-type and n-type half-metal magnetic semiconductor layers is prepared by doping a magnetic semiconductor with a transition metal atom and optionally with an acceptor or donor. Alternatively, each of the p-type and n-type half-metal magnetic semiconductor layers is prepared by providing a gate to a magnetic semiconductor and adjusting/controlling its ferromagnetic state according to the field effect. The present invention can solve the problem concerning the insufficient degree of circular polarization in conventional circular-polarization semiconductor laser sources.

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H. Yoshida et al.; Journal of the Crystallographic Society of Japan, vol. 27, No. 4, pp. 86-94. Cited in the int'l. search report.
K. Sato et al.; The Japan Society of Applied Physics, vol. 40, Part.2, No. 4A, pp. L334-L336, Apr. 1, 2001. Cited in the int'l. search report.
H. Ando et al.; Appl. Phys. Ltr. 73 (1998) 566. Cited in the specification.

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