CA2341817A1 - Method and apparatus for generating and controlling spin propagation using multiple coherent light beams - Google Patents

Method and apparatus for generating and controlling spin propagation using multiple coherent light beams Download PDF

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Publication number
CA2341817A1
CA2341817A1 CA 2341817 CA2341817A CA2341817A1 CA 2341817 A1 CA2341817 A1 CA 2341817A1 CA 2341817 CA2341817 CA 2341817 CA 2341817 A CA2341817 A CA 2341817A CA 2341817 A1 CA2341817 A1 CA 2341817A1
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Canada
Prior art keywords
coherent light
light beams
photoconductor
omega
spin
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Granted
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CA 2341817
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French (fr)
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CA2341817C (en
Inventor
Ravi D. Bhat
John Edward Sipe
Henry Martin Van Driel
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Individual
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Individual
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Priority to CA 2341817 priority Critical patent/CA2341817C/en
Priority to CA002378560A priority patent/CA2378560A1/en
Publication of CA2341817A1 publication Critical patent/CA2341817A1/en
Application granted granted Critical
Publication of CA2341817C publication Critical patent/CA2341817C/en
Anticipated expiration legal-status Critical
Expired - Fee Related legal-status Critical Current

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Classifications

    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01L—SEMICONDUCTOR DEVICES NOT COVERED BY CLASS H10
    • H01L31/00—Semiconductor devices sensitive to infrared radiation, light, electromagnetic radiation of shorter wavelength or corpuscular radiation and specially adapted either for the conversion of the energy of such radiation into electrical energy or for the control of electrical energy by such radiation; Processes or apparatus specially adapted for the manufacture or treatment thereof or of parts thereof; Details thereof
    • H01L31/08—Semiconductor devices sensitive to infrared radiation, light, electromagnetic radiation of shorter wavelength or corpuscular radiation and specially adapted either for the conversion of the energy of such radiation into electrical energy or for the control of electrical energy by such radiation; Processes or apparatus specially adapted for the manufacture or treatment thereof or of parts thereof; Details thereof in which radiation controls flow of current through the device, e.g. photoresistors
    • G—PHYSICS
    • G02—OPTICS
    • G02F—OPTICAL DEVICES OR ARRANGEMENTS FOR THE CONTROL OF LIGHT BY MODIFICATION OF THE OPTICAL PROPERTIES OF THE MEDIA OF THE ELEMENTS INVOLVED THEREIN; NON-LINEAR OPTICS; FREQUENCY-CHANGING OF LIGHT; OPTICAL LOGIC ELEMENTS; OPTICAL ANALOGUE/DIGITAL CONVERTERS
    • G02F1/00—Devices or arrangements for the control of the intensity, colour, phase, polarisation or direction of light arriving from an independent light source, e.g. switching, gating or modulating; Non-linear optics
    • G02F1/01—Devices or arrangements for the control of the intensity, colour, phase, polarisation or direction of light arriving from an independent light source, e.g. switching, gating or modulating; Non-linear optics for the control of the intensity, phase, polarisation or colour 
    • G02F1/0126—Opto-optical modulation, i.e. control of one light beam by another light beam, not otherwise provided for in this subclass

Abstract

The present invention uses quantum interference of one and two photon absorption from a multiple color fields to optically inject ballistic spin currents in unbiased photoconductors. The spin currents can be generated with and without an accompanying electrical current and can be controlled using the relative phase of the colors. In one aspect of the there is provided a method of generating spin currents in a photoconductor material comprising producing a first coherent light beam having a first frequency .omega.1 and a second coherent light beam having a frequency twice the first frequency 2.omega.1, polarizing the first and second coherent light beams to have a preselected polarization with respect to each other, and simultaneously irradiating a selected region of the photoconductor material with the first coherent light beam and the second coherent light beam to generate a spin current in the photoconductor.

Claims (15)

1. A method of generating spin currents in a photoconductor material, the method comprising the steps of:
producing a first coherent light beam having a first frequency .omega.1 and a second coherent light beam having a frequency twice the first frequency
2.omega.1, polarizing said first and second coherent light beams to have a preselected polarization with respect to each other, and simultaneously irradiating a selected region of the photoconductor material with said first coherent light beam and said second coherent light beam to generate a spin current in said photoconductor.
2. The method according to claim 1 including adjusting a phase relationship between the first and second coherent light beams to change the direction of the spin current generated in said photoconductor.
3. The method according to claims 1 or 2 wherein said first coherent light beam and said second coherent light beam are copropagating.
4. The method according to claim 3 wherein said copropagating first and second coherent light beams are linearly cross-polarized, and wherein said spin current is a pure spin current in which spin is transported but not electrical current.
5. The method according to claim 3 wherein said copropagating first and second coherent light beams are circularly polarized in the same direction, and wherein said spin current includes a pure spin current in the direction of propagation of the coherent light beams and a spin polarized electrical current in which both spin and electrical charge are transported in a direction perpendicular to the direction of propagation of the coherent light beams.
6. The method according to claim 5 wherein said first and second circularly polarized coherent light beams are right circularly polarized.
7. The method according to claim 5 wherein said first and second circularly polarized coherent light beams are left circularly polarized.
8. The method according to claim 3 wherein said copropagating first and second coherent light beams are colinearly polarized.
9. The method according to claims 1, 2, 3, 4, 5, 6, 7 or 8 wherein said photoconductor is a semiconductor.
10. The method according to claims 1, 2, 3, 4, 5, 6, 7, 8 or 9 wherein said photoconductor has a nanostructure geometry.
11. A method of generating spin currents in a photoconductor material, the method comprising the steps of:
producing at least three coherent light beams of frequencies .omega.1, .omega.2, and .omega.3, such that .omega.1=.omega.2+.omega.3, polarizing each of said at least three coherent light beams to have a preselected polarization with respect to the other coherent light beams, and simultaneously irradiating a selected region of the photoconductor material with said at least three coherent light beams to generate a spin current in said photoconductor.
12. The method according to claim 11 including adjusting a phase relationship between said at least three coherent light beams to change the direction of the spin current generated in said photoconductor.
13. The method according to claims 11 or 12 wherein said at least three coherent light beams are copropagating.
14. The method according to claims 11, 12 or 13 wherein said photoconductor is a semiconductor.
15. The method according to claims 11, 12, 13 or 14 wherein said photoconductor has a nanostructure geometry.
CA 2341817 2001-03-22 2001-03-22 Method and apparatus for generating and controlling spin propagation using multiple coherent light beams Expired - Fee Related CA2341817C (en)

Priority Applications (2)

Application Number Priority Date Filing Date Title
CA 2341817 CA2341817C (en) 2001-03-22 2001-03-22 Method and apparatus for generating and controlling spin propagation using multiple coherent light beams
CA002378560A CA2378560A1 (en) 2001-03-22 2002-03-22 Method and apparatus for generating and controlling spin propagation using one or more coherent light beams

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
CA 2341817 CA2341817C (en) 2001-03-22 2001-03-22 Method and apparatus for generating and controlling spin propagation using multiple coherent light beams

Publications (2)

Publication Number Publication Date
CA2341817A1 true CA2341817A1 (en) 2002-09-22
CA2341817C CA2341817C (en) 2011-01-25

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Family Applications (1)

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CA 2341817 Expired - Fee Related CA2341817C (en) 2001-03-22 2001-03-22 Method and apparatus for generating and controlling spin propagation using multiple coherent light beams

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CA (1) CA2341817C (en)

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN109716198A (en) * 2016-06-17 2019-05-03 索邦大学 With the device and correlation technique of controllable luminous intensity irradiation object

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN109716198A (en) * 2016-06-17 2019-05-03 索邦大学 With the device and correlation technique of controllable luminous intensity irradiation object
CN109716198B (en) * 2016-06-17 2022-10-04 索邦大学 Apparatus for illuminating an object with a controllable light intensity and associated method

Also Published As

Publication number Publication date
CA2341817C (en) 2011-01-25

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Effective date: 20130322