Janaszek, Andrzej and Wróbel, Piotr and Dems, Maciej and Mochalski, Marcel and Ceylan, Ömer and Gürbüz, Yaşar and Kubiszyn, Łukasz and SeredyńSki, Bartłomiej and Piotrowski, Józef and KotyńSki, Rafał (2025) Absorption enhancement in LWIR detector via waveguide and plasmonic modes engineering. Optics Express, 33 (24). pp. 50392-50406. ISSN 1094-4087
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Official URL: https://dx.doi.org/10.1364/OE.575783
Abstract
A high-temperature long-wavelength infrared (LWIR) photodetector using a thin InAs/InAsSb type-II superlattice (T2SL) absorber with enhanced optical absorption is demonstrated. The enhancement results from the excitation of planar waveguide and surface plasmon polariton (SPP) modes confined within the absorber and enabled by an adjacent highly doped semiconductor contact (HDSC) layer. While SPP modes contribute near the 10 µm resonance, stronger absorption arises from guided modes between 7 µm and 9 µm. The absorber–HDSC interface provides a large, tunable Fresnel reflection phase due to a lossless Drude-like contrast, despite material losses. This configuration offers superior mode confinement, phase control, and fabrication practicality, enabling efficient absorption in thin photodetectors and advancing subwavelength photonic design.
| Item Type: | Article |
|---|---|
| Divisions: | Faculty of Engineering and Natural Sciences |
| Depositing User: | Ömer Ceylan |
| Date Deposited: | 20 Feb 2026 15:28 |
| Last Modified: | 20 Feb 2026 15:28 |
| URI: | https://research.sabanciuniv.edu/id/eprint/53296 |
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Absorption enhancement in LWIR detector via waveguide and plasmonic modes engineering. (deposited 29 Sep 2025 11:44)
- Absorption enhancement in LWIR detector via waveguide and plasmonic modes engineering. (deposited 20 Feb 2026 15:28) [Currently Displayed]
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