Dual-band plasmonic resonance-enhanced absorptance in Au/Si:Te heterostructures for mid-infrared applications
This work reveals enhanced infrared optical properties in plasmonic Au/Si:Te heterostructures, where hyperdoped Si:Te layers fabricated via Te ion implantation and flashlamp annealing exhibit ∼20% broadband sub-bandgap absorption across 2–5 μm. Integration with Au nanostructures induces dual plasmonic resonances at 2.7 and 4.4 μm, boosting peak absorptance to 52%–83%. Electromagnetic simulations attribute this enhancement to plasmon-dielectric hybridization, where strong near-field amplification at the Au/Si:Te interface intensifies mid-gap state transitions in Si:Te. Concurrently, resonant energy transfer occurs, as grating-confined surface plasmons concentrate incident radiation, enhancing photon-impurity interactions. Geometric tuning further enables spectral selectivity with wavelength-specific absorption enhancement. The hyperdoped Si:Te heterostructures demonstrate complementary metal-oxide-semiconductor-compatible tailoring of light-matter interactions through hybrid plasmonic and impurity-band effects.
Authors
- Ulrich Kentsch (ORCID: https://orcid.org/0000-0001-5295-2554)
- R. Heller (ORCID: https://orcid.org/0000-0002-7679-3401)
- Shengqiang Zhou (ORCID: https://orcid.org/0000-0002-4885-799X)
- Songyuan Peng (ORCID: https://orcid.org/0009-0004-5661-4391)
- Yijia Huang (ORCID: https://orcid.org/0000-0002-1972-1970)
- Mohd Saif Shaikh (ORCID: https://orcid.org/0000-0002-7958-4306)
- René Hübner (ORCID: https://orcid.org/0000-0002-5200-6928)
- Feng Chen (ORCID: https://orcid.org/0000-0002-9277-9810)
- Ling Li (ORCID: https://orcid.org/0000-0002-2987-4890)
- Tingting Wang (ORCID: https://orcid.org/0009-0001-7629-4004)
- Mao Wang (ORCID: https://orcid.org/0000-0003-4606-7203)
- Jianqi Zhu (ORCID: https://orcid.org/0009-0009-7819-9308)
- A. Wang (ORCID: https://orcid.org/0009-0008-8069-1599)
- Mingyang Tian (ORCID: https://orcid.org/0000-0002-7544-5384)
- Mingrui Yuan (ORCID: https://orcid.org/0009-0005-0332-6254)
Institutions
- Shandong University (CN)
- Chengdu Medical College (CN)
- Helmholtz-Zentrum Dresden-Rossendorf (DE)
- Chengdu Normal University (CN)
- State Key Laboratory of Crystal Materials
- Sichuan Normal University (CN)
- Technische Universität Dresden (DE)
Publication Details
- Journal
- Applied Physics Letters
- Published
- 2025-11-10
- DOI
- https://doi.org/10.1063/5.0297871
- Citations
- 1
- Primary Topic
- Plasmonic and Surface Plasmon Research
- Type
- article
- Field-Weighted Citation Impact
- 0.67