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Proceedings Paper

Light-triggered GHz-frequency current oscillations with period governed by light interference pattern
Author(s): Liudvikas Subacius; Imantas Kasalynas
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Paper Abstract

We propose a novel way for the formation of GHz-frequency current oscillations in nonuniformly photoexcited and dc-biased semiconductor that exhibit a negative differential resistivity. A nonuniform heating of the electron gas in presence of both light interference field and strong external dc-field induces a high-field domain structure, which then progress and moves in spatially modulated carrier plasma. As a result, the oscillations of current density appear in external circuit attached to the sample. Numerical simulations performed on a bulk GaAs crystal prove that periodicity and modulation depth of the oscillations depends on spacing and intensity of light interference pattern. An experimental possibility to induce and detect microwave pulses of GHz-frequency is demonstrated in high-resistivity GaAs sample, mounted in series with low-impedance micro-stripe line, under carrier generation by two interfering laser beams of 2-ns duration.

Paper Details

Date Published: 8 August 2003
PDF: 7 pages
Proc. SPIE 5122, Advanced Organic and Inorganic Optical Materials, (8 August 2003); doi: 10.1117/12.515671
Show Author Affiliations
Liudvikas Subacius, Semiconductor Physics Institute (Lithuania)
Imantas Kasalynas, Semiconductor Physics Institute (Lithuania)


Published in SPIE Proceedings Vol. 5122:
Advanced Organic and Inorganic Optical Materials
Andris Krumins; Donats Millers; Inta Muzikante; Andris Sternbergs; Vismants Zauls, Editor(s)

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