HgCdTe-based heterostructures for Terahertz photonics


HgCdTe-based heterostructures for Terahertz photonics

Ruffenach, S.; Kadykov, A.; Rumyantsev, V. V.; Torres, J.; Coquillat, D.; But, D.; Krishtopenko, S. S.; Consejo, C.; Knap, W.; Winnerl, S.; Helm, M.; Fadeev, M. A.; Mikhailov, N. N.; Dvoretskii, S. A.; Gavrilenko, V. I.; Morozov, S. V.; Teppe, F.

Due to their specific physical properties, HgCdTe-based heterostructures are expected to play an important role in terahertz photonic systems. Here, focusing on gated devices presenting inverted band ordering, we evidence an enhancement of the terahertz photoconductive response close to the charge neutrality point and at the magnetic field driven topological phase transition. We also show the ability of these heterostructures to be used as terahertz imagers. Regarding terahertz emitters, we present results on stimulated emission of HgCdTe heterostructures in their conventional semiconductor state above 30THz, discussing the physical mechanisms involved and promising routes towards the 5–15 THz frequency domain.

Keywords: narrow-gap semiconductors; HgCdTe (MCT); THz detectors; THz sources

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Permalink: https://www.hzdr.de/publications/Publ-24867
Publ.-Id: 24867