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Proceedings Paper

Laser crossing in thin-film GaAs for all-optical computing realizations
Author(s): Artur Erlacher; Bruno Ullrich
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Paper Abstract

Photonic THz laser digitizing with thin-film GaAs on glass is demonstrated. In fact, the GaAs/glass interface can be used for an effective all-optical digitizer (35%) of transmitted and reflected laser beams. The films have been formed with pulsed-laser deposition. The switching principle is extremely straightforward: two (or more) laser rays were crossed at the same spot on the interface. Most of the experiments have been carried out with red (read) and green (write) laser rays. The information of the write beam is transferred to the read beam by means of alteration of the electronic state of the interface. Pump-probe experiments revealed that the absorption change, i.e., the alteration of the electronic state, takes place within a few picoseconds. Therefore, logic operations in the THz range become feasible. In addition, NOR and NAND gate realizations with laser crossing are possible. Besides the formation of smart all-optical cross-links, all-optical computing is further application of laser crossing. Based on the unmatched simplicity of the switch realization, switching speed, and the fairly low material quality demands, laser crossing in thin-film GaAs has the potential to be used in future optical networks. This work further stresses the hybrid mode with laser crossing in thin-film GaAs/glass interfaces.

Paper Details

Date Published: 30 August 2005
PDF: 7 pages
Proc. SPIE 5907, Photonic Devices and Algorithms for Computing VII, 590703 (30 August 2005); doi: 10.1117/12.615198
Show Author Affiliations
Artur Erlacher, Bowling Green State Univ. (United States)
Bruno Ullrich, Bowling Green State Univ. (United States)

Published in SPIE Proceedings Vol. 5907:
Photonic Devices and Algorithms for Computing VII
Khan M. Iftekharuddin; Abdul A. S. Awwal, Editor(s)

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