Fig. 5: Optical properties of the array of HgTe nanocrystals (NCs) deposited on a nanotrench electrode.
From: Infrared photoconduction at the diffusion length limit in HgTe nanocrystal arrays
a Absorption map at 2.5 µm of a 300-nm film of NCs on a gold mirror. b. (resp. c) Absorption map at 2.5 µm of a 300-nm film of NCs on a 40-nm nanotrench in TM (resp TE) polarization. TM (resp. TE) polarization correspond to the magnetic (resp. electric) field along the trench. The axes are in nm. d Photocurrent spectrum for a HgTe NC array deposited on a 40-nm nanotrench electrode with and without a polarizer. The bias is 1 V and measurement is conducted at room temperature. e Current as a function of time for a HgTe NC array deposited on a 40-nm nanotrench electrode as the illumination is turned on and off. Pink and green dashed lines correspond to an exponential fit of the rise and the decay as the light is turned on and off. Measured rise and decay time are 22 and 24 µs, respectively. The illumination is ensured by a 1.55 µm laser diode delivering 2 mW of optical power and modulated at 1 kHz. The bias is 1 V.
