Infrared sensing using nanocrystal toward on demand light matter coupling

Eva Izquierdo1, Audrey Chu1,2, Charlie Gréboval1, Gregory Vincent2, David Darson3, Victor Parahyba4, Pierre Potet4, Emmanuel Lhuillier1*
1 Sorbonne Université, CNRS, Institut des NanoSciences de Paris, INSP, 75005 Paris, France.
2 ONERA – The French Aerospace Lab, 6, chemin de la Vauve aux Granges, BP 80100, 91123 Palaiseau, France.
3 Laboratoire de physique de l’Ecole Normale Supérieure, ENS, Université PSL, CNRS, Sorbonne Université, Université de Paris, 75005 Paris, France
4 New Imaging Technologies SA, 1 impasse de la Noisette 91370 Verrières le Buisson, France

Abstract

Nanocrystals are semiconductor nanoparticles whose optical properties can be tuned from UV up to THz. They are used as sources of green and red light for displays, and also show exhibit promises to design low-cost infrared detectors. Coupling subwavelength optical resonators to nanocrystals film enables to design photodiodes that absorb 80% of incident light from thin (<150 nm) nanocrystal film. It thus becomes possible to overcome the constraints linked to the short diffusion lengths which result from transport by hopping within arrays of nanocrystals enabling a high photoresponse detector operating in the SWIR range