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PhD on infrared antenna-coupled photodetectors based on colloidal nanocrystals

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Français - Anglais

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General information

Reference : UMR8023-ANGVAS-003
Workplace : PARIS 05
Date of publication : Friday, June 19, 2020
Scientific Responsible name : Angela Vasanelli
Type of Contract : PhD Student contract / Thesis offer
Contract Period : 36 months
Start date of the thesis : 1 September 2020
Proportion of work : Full time
Remuneration : 2 135,00 € gross monthly

Description of the thesis topic

Infrared detection is at the heart of several application domains, ranging from environment monitoring to night imaging for automotive, security and defense. For these applications, a major technological challenge is the realization of compact and low cost devices, operating at room temperature.

First used as light emitters for displays, colloidal nanocrystals have recently attracted considerable attention as active medium of photodetectors in the mid-infrared wavelength range [1], where technology is currently dominated by epitaxally grown III-V (InSb, InGaAs, GaAs) and II-VI (HgCdeTe) semiconductors. However, present mid-infrared detectors based on nanocrystals remain at a fairly basic level. In this project, we propose the use of metallic resonators to improve the performances of nanocrystal based photodetectors by increasing the light-matter interaction in a small effective volume. Metallic resonators are indeed well known to provide highly subwavelength electromagnetic confinement. Furthermore, they also inherently act as antennas, gathering photons from an area that can be much larger than the object itself. Both these properties have allowed a strong improvement in the performances of GaAs quantum well infrared photodetectors, in terms of detectivity and operation temperature [2].
The goal of this PhD project will be to conceive, fabricate and characterize such plasmonic nanocolloidal quantum detectors. The work will be performed jointly at LPENS, in the Quantum Physics and Devices group (QUAD) for the design and characterization of the devices, and at INSP, under the supervision of Emmanuel Lhuillier, for their fabrication.

[1] C. Livache et al., A colloidal quantum dot infrared photodetector and its use for intraband detection, Nature Comm. 10, 2125 (2019); A. Chu et al., Near Unity Absorption in Nanocrystal Based Short Wave Infrared Photodetectors using Guided Mode Resonators, ACS Photonics (2019)
[2] D. Palaferri et al., Room-temperature nine-µm-wavelength photodetectors and GHz-frequency heterodyne receivers, Nature 556, 85 (2018)

Work Context

Quantum physics and devices group
Physics Laboratory at the Ecole Normale Supérieure

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