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Peer-reviewedCC BY 4.0Nanomaterials

Near-Unity and Narrowband Light Absorption in Mid-Infrared α-MoO3-Based Metasurfaces

  • Didi Song1
  • Wei Li1
  • Lijia Wan1
  • Yufang Liu2
  • Xiaohu Wu3,4,5
  • Kun Yu2
5 affiliations
  1. 1School of Science, Jiangxi University of Water Resources and Electric Power, Nanchang 330099, China
  2. 2Henan Key Laboratory of Infrared Materials & Spectrum Measures and Applications, School of Physics, Henan Normal University, Xinxiang 453007, China
  3. 3School of Integrated Circuits, Hubei University, Wuhan 430062, China
  4. 4Yangtze Laboratory, Wuhan 430205, China
  5. 5Thermal Science Research Center, Shandong Institute of Advanced Technology, Jinan 250100, China
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Abstract

Accessing mid-infrared narrowband absorption is crucial for applications such as spectroscopic analysis, infrared imaging and optical sensing. Here, we investigate the interaction between light and α-phase molybdenum trioxide (α-MoO3) nanocavities, uncovering pronounced and highly tunable resonant responses across the hyperbolic transition regime. Moving beyond standard phonon polariton excitations, our results reveal that the elevated refractive index of α-MoO3 beyond the Reststrahlen band promotes strong electromagnetic confinement and enhanced light-matter coupling in subwavelength nanostructures across the 12–13 μm spectral window. Analysis of the electric-field distributions reveals a hybrid collective mode arising from the interaction between Fabry–Perot cavity modes and geometry-dependent Mie-type resonances, leading to absorption approaching unity together with spectrally sharp resonances exhibiting quality factors exceeding 100 near the transverse-optical phonon frequency of α-MoO3. These findings provide novel insights for the development of compact mid-infrared photonic structures for tailoring thermal emission and enhancing electromagnetic coupling in α-MoO3-based nanophotonic platforms.

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Cite

BibTeXRIS
BibTeX
@article{song2026nearunity,
  title = {{Near-Unity and Narrowband Light Absorption in Mid-Infrared α-MoO3-Based Metasurfaces}},
  author = {Didi Song and Wei Li and Lijia Wan and Yufang Liu and Xiaohu Wu and Kun Yu},
  journal = {Nanomaterials},
  year = {2026},
  month = oct,
  doi = {10.3390/nano16211388},
  url = {https://www.mdpi.com/2079-4991/16/21/1388},
  note = {CC BY 4.0},
}
RIS
TY  - JOUR
TI  - Near-Unity and Narrowband Light Absorption in Mid-Infrared α-MoO3-Based Metasurfaces
AU  - Didi Song
AU  - Wei Li
AU  - Lijia Wan
AU  - Yufang Liu
AU  - Xiaohu Wu
AU  - Kun Yu
PY  - 2026
DA  - 2026/10/29
JO  - Nanomaterials
DO  - 10.3390/nano16211388
UR  - https://www.mdpi.com/2079-4991/16/21/1388
AB  - Accessing mid-infrared narrowband absorption is crucial for applications such as spectroscopic analysis, infrared imaging and optical sensing. Here, we investigate the interaction between light and α-phase molybdenum trioxide (α-MoO3) nanocavities, uncovering pronounced and highly tunable resonant responses across the hyperbolic transition regime. Moving beyond standard phonon polariton excitations, our results reveal that the elevated refractive index of α-MoO3 beyond the Reststrahlen band promotes strong electromagnetic confinement and enhanced light-matter coupling in subwavelength nanostructures across the 12–13 μm spectral window. Analysis of the electric-field distributions reveals a hybrid collective mode arising from the interaction between Fabry–Perot cavity modes and geometry-dependent Mie-type resonances, leading to absorption approaching unity together with spectrally sharp resonances exhibiting quality factors exceeding 100 near the transverse-optical phonon frequency of α-MoO3. These findings provide novel insights for the development of compact mid-infrared photonic structures for tailoring thermal emission and enhancing electromagnetic coupling in α-MoO3-based nanophotonic platforms.
SN  - 2079-4991
ER  -