期刊
NANO LETTERS
卷 21, 期 15, 页码 6671-6677出版社
AMER CHEMICAL SOC
DOI: 10.1021/acs.nanolett.1c02193
关键词
plasmon; hopping transport; nanocrystal; bias-induced spectral shift; infrared
类别
资金
- ERC [756225]
- Region Ile-de-France in the framework of DIM Nano-K
- French state funds [ANR-11-IDEX-0004-02, ANR18CE30-0023-01, ANR-19-CE24-0022, ANR-19-CE09-0017, ANR-19-CE09-0026, ANR-20-ASTR-0008-01]
- Agence Innovation Defense
The study demonstrates that bias tunable aspectral response can be achieved by coupling a HgTe NC array with a plasmonic resonator. The observed blueshift arises from the interplay between hopping transport and inhomogeneous absorption due to the presence of the photonic structure. This research expands the realm of existing NC-based devices and lays the foundation for light modulators.
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 bias tunable aspectral response is obtained by coupling a HgTe NC array with a plasmonic resonator. Up to 15 meV blueshift can be achieved from a 3 mu m 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 toward light modulators.
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