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Peer-reviewedCC BY 4.0Nanomaterials

Wavelength- and Polarization-Multiplexed Dielectric Metasurface for On-Demand Generation and Continuous Tuning of Optical Fields

  • Qi Zhang1
  • Jiaqi Xing1
  • Haoze Pan1
  • Shun Zhou1
  • Qi Xu2
  • Nana Wang3
  • Changda Zhou2
  1. 1School of Medical Information Engineering, Jining Medical University, Jining 272067, China
  2. 2State Key Laboratory of Optoelectronic Materials and Technologies, School of Physics, Sun Yat-sen University, Guangzhou 510275, China
  3. 3School of Criminal Science and Technology, Shandong Police College, Jinan 250200, China
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Abstract

Despite progress in optical multiplexing, integrating discrete channel switching with continuous control of distinct optical fields in a single metasurface remains challenging. Here, we numerically demonstrate a dielectric metasurface that enables wavelength- and polarization-selective generation of focal spots and perfect vortex beams (PVBs), with their relative contributions continuously tuned via the incident ellipticity without reconfiguring the structure. This functionality is enabled by combining wavelength-selective Si nanopillars with Pancharatnam–Berry geometric-phase encoding, which decouples wavelength selectivity from phase control. Under circularly polarized illumination, focal spots and PVBs are selectively generated at both 532 nm and 632.8 nm. The generated PVBs exhibit a common ring radius with wavelength-dependent topological charges of l = +4 at 532 nm and l = −2 at 632.8 nm, and their modal purities reach 79.7% and 97.7%, respectively. Under horizontal linearly polarized light, both circular-polarization channels are simultaneously excited to produce a hybrid field composed of a focal spot and a PVB. As the ellipticity increases, the ratio of PVB to focal spot intensity rises continuously, in good agreement with the analytical modal. The flexibility of the proposed approach is further demonstrated by off-axis focusing, non-uniform phase PVB generation, and control of the PVB ring radius. This work provides a reconfiguration-free platform that combines wavelength- and polarization-selective switching with continuous control of relative modal contributions, offering potential applications in optical trapping and mode-division multiplexing.

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Cite

BibTeXRIS
BibTeX
@article{zhang2026wavelength,
  title = {{Wavelength- and Polarization-Multiplexed Dielectric Metasurface for On-Demand Generation and Continuous Tuning of Optical Fields}},
  author = {Qi Zhang and Jiaqi Xing and Haoze Pan and Shun Zhou and Qi Xu and Nana Wang and Changda Zhou},
  journal = {Nanomaterials},
  year = {2026},
  month = oct,
  doi = {10.3390/nano16201324},
  url = {https://www.mdpi.com/2079-4991/16/20/1324},
  note = {CC BY 4.0},
}
RIS
TY  - JOUR
TI  - Wavelength- and Polarization-Multiplexed Dielectric Metasurface for On-Demand Generation and Continuous Tuning of Optical Fields
AU  - Qi Zhang
AU  - Jiaqi Xing
AU  - Haoze Pan
AU  - Shun Zhou
AU  - Qi Xu
AU  - Nana Wang
AU  - Changda Zhou
PY  - 2026
DA  - 2026/10/01
JO  - Nanomaterials
DO  - 10.3390/nano16201324
UR  - https://www.mdpi.com/2079-4991/16/20/1324
AB  - Despite progress in optical multiplexing, integrating discrete channel switching with continuous control of distinct optical fields in a single metasurface remains challenging. Here, we numerically demonstrate a dielectric metasurface that enables wavelength- and polarization-selective generation of focal spots and perfect vortex beams (PVBs), with their relative contributions continuously tuned via the incident ellipticity without reconfiguring the structure. This functionality is enabled by combining wavelength-selective Si nanopillars with Pancharatnam–Berry geometric-phase encoding, which decouples wavelength selectivity from phase control. Under circularly polarized illumination, focal spots and PVBs are selectively generated at both 532 nm and 632.8 nm. The generated PVBs exhibit a common ring radius with wavelength-dependent topological charges of l = +4 at 532 nm and l = −2 at 632.8 nm, and their modal purities reach 79.7% and 97.7%, respectively. Under horizontal linearly polarized light, both circular-polarization channels are simultaneously excited to produce a hybrid field composed of a focal spot and a PVB. As the ellipticity increases, the ratio of PVB to focal spot intensity rises continuously, in good agreement with the analytical modal. The flexibility of the proposed approach is further demonstrated by off-axis focusing, non-uniform phase PVB generation, and control of the PVB ring radius. This work provides a reconfiguration-free platform that combines wavelength- and polarization-selective switching with continuous control of relative modal contributions, offering potential applications in optical trapping and mode-division multiplexing.
SN  - 2079-4991
ER  -