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Scientific article
English

An IR modulator based on the self-assembly of gold nanoparticles on germanium

Published inPCCP. Physical chemistry chemical physics, vol. 16, no. 36, p. 19402-19407
Publication date2014
Abstract

By using a polyelectrolyte layer gold nanoparticles have been assembled onto a Ge internal reflection element. Upon illumination with visible and near infrared light a strong infrared absorption has been observed, which can be traced to intervalence band transitions in Ge. This reveals the existence of holes in the Ge near its valence band edge. The switching between bright and dark states is faster than 160 μs and the device acts as an infrared modulator. The effect develops with a peculiar kinetics, which may indicate the development of an interfacial layer between germanium and gold that allows efficient electron transfer upon illumination.

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Citation (ISO format)
GHOSH, Harekrishna, BOUHEKKA, Ahmed, BUERGI, Thomas. An IR modulator based on the self-assembly of gold nanoparticles on germanium. In: PCCP. Physical chemistry chemical physics, 2014, vol. 16, n° 36, p. 19402–19407. doi: 10.1039/C4CP02437K
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ISSN of the journal1463-9076
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Creation10/10/2014 10:45:00 AM
First validation10/10/2014 10:45:00 AM
Update time03/14/2023 9:50:48 PM
Status update03/14/2023 9:50:48 PM
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