Exciton Optoelectronic Transistor
As the communications industry continues its shift into optically based systems, the demand for devices that have the capability to process optical signals in an efficient and expedient manner is steadily increasing. The development of optically based devices that can perform all necessary logic operations (i.e., switching, AND/OR operations) in a simple and compact manner are vital to increasing the speed of information processing. One of the critical devices of electronic logic is the transistor—a three-terminal device with the current through two terminals controlled by the third terminal. There are many proposals for optoelectronic and all-optical transistors, and the modulation of optical signals has been demonstrated by a variety of methods. Development of semiconductor-based optical transistors attracts a particular interest due to the opportunity to create scalable optoelectronic circuits integrated in a chip.
This invention details experimental proof for an optoelectronic transistor based on the modulation of exciton flux via gate voltage. The exciton optoelectronic transistor (EXOT) implements electronic operation on photons by using excitons as intermediate media; the intensity of light emitted at the optical output is proportional to the intensity of light at the optical input and is controlled electronically by the gate. The results demonstrate a contrast ratio of 30 between an on state and an off state of the EXOT and its operation at speeds greater than 1 GHz. Studies also demonstrate high-speed control of both the flux and the potential energy of excitons on a time scale much shorter than the exciton lifetime.
Patent Number: US7825402B2
Application Number: US2008293909A
Inventor: Butov, Leonid
Priority Date: 27 Mar 2006
Priority Number: US7825402B2
Application Date: 16 Dec 2008
Publication Date: 2 Nov 2010
IPC Current: G02F000101
US Class: 257024 | 250225 | 257E29168
Assignee Applicant: The Regents of the University of California
Title: Excitonic signal processing optically interfaced electrically controlled devices
Usefulness: Excitonic signal processing optically interfaced electrically controlled devices
Summary: For integrated electro optical circuit (claimed).
Novelty: Optical interface electrically controlled device for integrated electro optical circuit has localized control gate electrode disposed over control gate electrode region of photonically responsive intrinsic semiconductor material
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7825402
Intellectual Property Info This invention is patent pending with commercial rights available. Tech ID/UC Case 21138/2006-186-0 Related Cases 2006-186-0
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