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Peer-reviewedCC BY 4.0Nanomaterials

Bidirectional Mid-Infrared Metamaterial with Ultrabroadband Polarization-Selective Absorption and Transmission

  • Zheng Qin1,2
  • Yongzhou Zhao3
  • Yutong Zhou1
  • Haihong Yu4
  • Yijun Zhang5
5 affiliations
  1. 1School of Intelligence Science and Technology, Nanjing University of Science and Technology, Nanjing 210094, China
  2. 2Jiangsu Fasten Optoelectronics Technology Co., Ltd., Jiangyin 214400, China
  3. 3School of Optoelectronic Engineering, Chongqing University of Posts and Telecommunications, Chongqing 400065, China
  4. 4Physical Department, Changchun University of Science and Technology, Changchun 130012, China
  5. 5School of Electronic and Optical Engineering, Nanjing University of Science and Technology, Nanjing 210094, China
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Abstract

Optical metamaterials provide a versatile platform for manipulating the amplitude, phase, and polarization of light at subwavelength scales and are therefore attractive for compact polarization-control devices. However, simultaneously realizing broadband polarization-selective absorption and transmission with bidirectional operation remains challenging. Here, we propose a bidirectional mid-infrared polarization-selective metamaterial comprising multilayer strip resonators integrated with a composite Au grating. For x-polarized incidence, the final bidirectional structure maintains an absorptance above 80% from 3.95 to 12.15 μm, with an average absorptance of 90.4%. For the orthogonal y-polarized incidence, the average transmittance reaches approximately 94% over the same spectral range. The device exhibits broadband polarization selectivity, with average absorption and transmission extinction ratios of 16.5 dB and 42.6 dB, respectively. Electromagnetic-field and structural analyses indicate that the broadband x-polarized absorption is associated with multiple localized resonances together with lattice- and Fabry–Pérot-cavity-related contributions, whereas the high y-polarized transmission is primarily enabled by the polarization-selective response of the Au grating. The symmetric configuration preserves these complementary polarization responses for illumination from either side, providing a route toward broadband multifunctional polarization control in the mid-infrared.

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Cite

BibTeXRIS
BibTeX
@article{qin2026bidirectional,
  title = {{Bidirectional Mid-Infrared Metamaterial with Ultrabroadband Polarization-Selective Absorption and Transmission}},
  author = {Zheng Qin and Yongzhou Zhao and Yutong Zhou and Haihong Yu and Yijun Zhang},
  journal = {Nanomaterials},
  year = {2026},
  month = oct,
  doi = {10.3390/nano16211348},
  url = {https://www.mdpi.com/2079-4991/16/21/1348},
  note = {CC BY 4.0},
}
RIS
TY  - JOUR
TI  - Bidirectional Mid-Infrared Metamaterial with Ultrabroadband Polarization-Selective Absorption and Transmission
AU  - Zheng Qin
AU  - Yongzhou Zhao
AU  - Yutong Zhou
AU  - Haihong Yu
AU  - Yijun Zhang
PY  - 2026
DA  - 2026/10/24
JO  - Nanomaterials
DO  - 10.3390/nano16211348
UR  - https://www.mdpi.com/2079-4991/16/21/1348
AB  - Optical metamaterials provide a versatile platform for manipulating the amplitude, phase, and polarization of light at subwavelength scales and are therefore attractive for compact polarization-control devices. However, simultaneously realizing broadband polarization-selective absorption and transmission with bidirectional operation remains challenging. Here, we propose a bidirectional mid-infrared polarization-selective metamaterial comprising multilayer strip resonators integrated with a composite Au grating. For x-polarized incidence, the final bidirectional structure maintains an absorptance above 80% from 3.95 to 12.15 μm, with an average absorptance of 90.4%. For the orthogonal y-polarized incidence, the average transmittance reaches approximately 94% over the same spectral range. The device exhibits broadband polarization selectivity, with average absorption and transmission extinction ratios of 16.5 dB and 42.6 dB, respectively. Electromagnetic-field and structural analyses indicate that the broadband x-polarized absorption is associated with multiple localized resonances together with lattice- and Fabry–Pérot-cavity-related contributions, whereas the high y-polarized transmission is primarily enabled by the polarization-selective response of the Au grating. The symmetric configuration preserves these complementary polarization responses for illumination from either side, providing a route toward broadband multifunctional polarization control in the mid-infrared.
SN  - 2079-4991
ER  -