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Science. 2008 Jul 11;321(5886):229-31. doi: 10.1126/science.1157845. Epub 2008 Jun 19.

Control of exciton fluxes in an excitonic integrated circuit.

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Department of Physics, University of California at San Diego, La Jolla, CA 92093-0319, USA.


Efficient signal communication uses photons. Signal processing, however, uses an optically inactive medium, electrons. Therefore, an interconnection between electronic signal processing and optical communication is required at the integrated circuit level. We demonstrated control of exciton fluxes in an excitonic integrated circuit. The circuit consists of three exciton optoelectronic transistors and performs operations with exciton fluxes, such as directional switching and merging. Photons transform into excitons at the circuit input, and the excitons transform into photons at the circuit output. The exciton flux from the input to the output is controlled by a pattern of the electrode voltages. The direct coupling of photons, used in communication, to excitons, used as the device-operation medium, may lead to the development of efficient exciton-based optoelectronic devices.

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