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Bias Tunable Spectral Response of Nanocrystal Array in a Plasmonic Cavity

Abstract : Nanocrystals (NCs) have gained considerable attention for their broadly tunable absorption from the UV to the THz range. Nevertheless, their optical features suffer from a lack of tunability once integrated into optoelectronic devices. Here, we show that tunable absorption with bias can be obtained by coupling a HgTe NC array with a plasmonic resonator. Up to 15 meV blueshift can be achieved from a 3-µm absorbing wavelength structure under a 3 V bias voltage when the NC exciton is coupled with a mode of the resonator. We demonstrate that the blueshift arises from the interplay between hopping transport and inhomogeneous absorption due to the presence of the photonic structure. The observed tunable spectral response is qualitatively reproduced in simulation by introducing a bias-dependent diffusion length in the charge transport. This work expands the realm of existing NC-based devices and paves the way towards light modulators.
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https://hal.archives-ouvertes.fr/hal-03321716
Contributor : Emmanuel Lhuillier Connect in order to contact the contributor
Submitted on : Wednesday, August 18, 2021 - 8:51:58 AM
Last modification on : Tuesday, October 19, 2021 - 11:10:48 AM

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Tung Huu Dang, Angela Vasanelli, Yanko Todorov, Carlo Sirtori, Yoann Prado, et al.. Bias Tunable Spectral Response of Nanocrystal Array in a Plasmonic Cavity. Nano Letters, American Chemical Society, 2021, 21 (15), pp.6671-6677. ⟨10.1021/acs.nanolett.1c02193⟩. ⟨hal-03321716⟩

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