Plasmon-enhanced high operating temperature infrared photodetectors

Janaszek, Andrzej and Wróbel, Piotr and Kotyński, Rafał and Dems, Maciej and Ceylan, Ömer and Gürbüz, Yaşar and Kubiszyn, Łukasz and Piotrowski, Józef (2023) Plasmon-enhanced high operating temperature infrared photodetectors. In: Metamaterials XIV 2023, Prague

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Plasmonic enhancement has a great potential for performance improvement of high operating temperature (HOT) photodetectors, especially those optimized for long-wavelength infrared (LWIR). Conventional HOT photodetectors exhibit poor quantum efficiency (QE) due to short carrier diffusion lengths of narrow bandgap semiconductors and relatively low absorption coefficients within the LWIR range. Plasmon-driven subwavelength light confinement enables high absorption even in a very thin absorber that provides efficient carrier collection, boosting the detector QE. We propose a photovoltaic detector equipped with a two-dimensional subwavelength hole array (2DSHA) in gold metallization on InAs/InAsSb type-II superlattice (T2SL) heterostructure. Our numerical study utilizing the finite-difference time-domain (FDTD) method predicts five times increased absorption in comparison with a conventional, back-side illuminated device. The simulated behavior of the plasmonic structure was confirmed experimentally by transmittance measurements, which revealed resonant features corresponding to various plasmonic modes.
Item Type: Papers in Conference Proceedings
Uncontrolled Keywords: high operating temperature; infrared photodetectors; light confinement; long-wavelength infrared; plasmon; subwavelength hole array; type-II superlattice
Divisions: Faculty of Engineering and Natural Sciences
Depositing User: Ömer Ceylan
Date Deposited: 04 Oct 2023 10:27
Last Modified: 04 Oct 2023 10:27

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