Guided mode resonator coupled with nanocrystal intraband absorption

Adrien Khalili (1) , Mateusz Weis (2) , Simon Gwénaël Mizrahi (2) , Audrey Chu (1) , Tung Huu Dang (1) , Claire Abadie (1) , Charlie Gréboval (1) , Corentin Dabard (3) , Yoann Prado (4) , Xiang Zhen Xu (3) , Emmanuel Péronne (2) , Clément Livache (5) , Sandrine Ithurria (3) , Gilles Patriarche (6) , Julien Ramade (7) , Grégory Vincent (8) , Davide Boschetto (2) , Emmanuel Lhuillier (1)

1 INSP-E6 - Physico-chimie et dynamique des surfaces
2 LOA - Laboratoire d'optique appliquée
3 LPEM - Laboratoire de Physique et d'Etude des Matériaux (UMR 8213)
4 INSP-E4 - Nanostructures et optique
5 LANL - Los Alamos National Laboratory
6 C2N - Centre de Nanosciences et de Nanotechnologies
7 PPNa - Physique et Propriétés des Nanostructures PPNa
8 DOTA, ONERA, Université Paris Saclay [Palaiseau]

Intraband absorption in doped nanocrystals offers an interesting alternative to narrow band gap materials to explore mid infrared optoelectronic device designs. However, the performance of such device clearly lags behind the ones relying on intrinsic materials. Livache et al. have proposed a dye sensitized approach to overcome the limitations observed from intraband materials (high dark current, slow response, low activation energy), where the intraband absorber is coupled to an undoped material which takes care of the charge conduction. Here, we unveil the coupling between both materials using mid-infrared transient reflectivity (TR) measurement. We show that hybrid material displays a unique feature in the TR signal that we attribute to a charge transfer and for which the dynamic matches the hopping time. We then developed a strategy to enhance the photodetection performances of the hybrid material by coupling for the first time intraband absorption to a light resonator. The latter is used to enhance the absorption by a factor 4 and enables an increase of the operating temperature by 80 K compared to the reference device. The obtained device matches the performance of best devices relying on intraband absorption.

Keywords: intraband absorption; mid-infrared; doped nanocrystals; mercury chalcogenides; optical resonator

Domains: Chemical Sciences; Material chemistry; Physics [physics]; Condensed Matter [cond-mat]

Adrien Khalili, Mateusz Weis, Simon Gwénaël Mizrahi, Audrey Chu, Tung Huu Dang, et al.. Guided mode resonator coupled with nanocrystal intraband absorption. ACS photonics, 2022, ⟨10.1021/acsphotonics.1c01847⟩. ⟨hal-03564753⟩