Excitonic switches at 100 K temperatures

Details Excitonic switches at 100 K temperatures Excitonic switches at 100 K temperatures

2009-10-03

arxiv.org/abs/0910.0528v2

Nature Photonics 3, 577 - 580 (2009)

Physics

Condensed Matter

Mesoscale and Nanoscale Physics

5 pages, 5 figures; added references for abstract, changed Figure 1

Scientific paper

Photonic and optoelectronic devices may offer the opportunity to realize efficient signal processing at speeds higher than in conventional electronic devices. Switches form the building blocks for circuits and fast photonic switches have been realized [1,2,3,4,5,6]. Recently, proof of principle of exciton optoelectronic devices was demonstrated [7,8]. Potential advantages of excitonic devices include high operation and interconnection speed, small dimensions, and the opportunity to combine many elements into integrated circuits. Here, we demonstrate experimental proof of principle for the operation of excitonic switching devices at temperatures around 100 K. The devices are based on an AlAs/GaAs coupled quantum well structure and include the exciton optoelectronic transistor (EXOT), the excitonic bridge modulator (EXBM), and the excitonic pinch-off modulator (EXPOM). This is a two orders of magnitude increase in the operation temperature compared to the earlier devices, where operation was demonstrated at 1.5 K [7,8].

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