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Peer-reviewedCC BY-NC-NDACS nano

Deep-Subwavelength and Broadband Quarter-Wave Retardation in Ultrathin Hyperbolic MoOCl2.

  • Georgy Ermolaev1
  • Adilet Toksumakov1
  • Valeria Maslova1,2
  • Aleksandr Slavich1
  • Anton Minnekhanov1
  • Gleb Tselikov1
  • Nikolay Pak1
  • Andrey Vyshnevyy1
  • Aljoscha Söll3
  • Zdenek Sofer3
  • Aleksey Arsenin1
  • Kostya S Novoselov4,5,6
1 more authors
  • Valentyn Volkov1
6 affiliations
  1. 1Emerging Technologies Research Center, XPANCEO, Internet City, Emmay Tower, Dubai00000, United Arab Emirates.
  2. 2C.H.O.S.E. (Center for Hybrid and Organic Solar Energy), Electronic Engineering Department, University of Rome Tor Vergata, Via del Politecnico 1, 00118Rome, Italy.
  3. 3Department of Inorganic Chemistry, University of Chemistry and Technology Prague, 16628Prague 6, Czech Republic.
  4. 4National Graphene Institute (NGI), University of Manchester, ManchesterM13 9PL, U.K.
  5. 5Department of Materials Science and Engineering, National University of Singapore, Singapore03-09 EA, Singapore.
  6. 6Institute for Functional Intelligent Materials, National University of Singapore, Singapore117544, Singapore.
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Abstract

The miniaturization of polarization-controlling optical components is one of the central pursuits in nanophotonics. While traditional anisotropic materials require large propagation lengths to achieve the desired phase shifts, metasurfaces mitigate this size constraint but often introduce narrow operational bandwidths and high fabrication complexities. To bridge this gap, we introduce MoOCl2 as a promising material for ultracompact and broadband phase retardation. Building on its giant optical anisotropy, we experimentally demonstrate MoOCl2 quarter-wave plates with thicknesses down to 65 nm. These flakes exhibit achromatic quarter-wave retardation across broad visible and near-infrared (510-900 nm) spectral windows, surpassing the fundamental thickness and bandwidth limitations of both conventional optical materials and artificial nanostructures. Moreover, MoOCl2 wave plates demonstrate a measured retardance tolerance reaching λ/4500 at their experimentally determined quarter-wave wavelengths. As a result, this study establishes MoOCl2 as a building block for ultracompact polarization optics.

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Cite

BibTeXRIS
BibTeX
@article{ermolaev2026deepsubwavelength,
  title = {{Deep-Subwavelength and Broadband Quarter-Wave Retardation in Ultrathin Hyperbolic MoOCl2.}},
  author = {Georgy Ermolaev and Adilet Toksumakov and Valeria Maslova and Aleksandr Slavich and Anton Minnekhanov and Gleb Tselikov and Nikolay Pak and Andrey Vyshnevyy and Aljoscha Söll and Zdenek Sofer and Aleksey Arsenin and Kostya S Novoselov and Valentyn Volkov},
  journal = {ACS nano},
  year = {2026},
  month = oct,
  doi = {10.1021/acsnano.6c10350},
  url = {https://europepmc.org/article/MED/42917195},
  note = {CC BY-NC-ND},
}
RIS
TY  - JOUR
TI  - Deep-Subwavelength and Broadband Quarter-Wave Retardation in Ultrathin Hyperbolic MoOCl2.
AU  - Georgy Ermolaev
AU  - Adilet Toksumakov
AU  - Valeria Maslova
AU  - Aleksandr Slavich
AU  - Anton Minnekhanov
AU  - Gleb Tselikov
AU  - Nikolay Pak
AU  - Andrey Vyshnevyy
AU  - Aljoscha Söll
AU  - Zdenek Sofer
AU  - Aleksey Arsenin
AU  - Kostya S Novoselov
AU  - Valentyn Volkov
PY  - 2026
DA  - 2026/10/01
JO  - ACS nano
DO  - 10.1021/acsnano.6c10350
UR  - https://europepmc.org/article/MED/42917195
AB  - The miniaturization of polarization-controlling optical components is one of the central pursuits in nanophotonics. While traditional anisotropic materials require large propagation lengths to achieve the desired phase shifts, metasurfaces mitigate this size constraint but often introduce narrow operational bandwidths and high fabrication complexities. To bridge this gap, we introduce MoOCl2 as a promising material for ultracompact and broadband phase retardation. Building on its giant optical anisotropy, we experimentally demonstrate MoOCl2 quarter-wave plates with thicknesses down to 65 nm. These flakes exhibit achromatic quarter-wave retardation across broad visible and near-infrared (510-900 nm) spectral windows, surpassing the fundamental thickness and bandwidth limitations of both conventional optical materials and artificial nanostructures. Moreover, MoOCl2 wave plates demonstrate a measured retardance tolerance reaching λ/4500 at their experimentally determined quarter-wave wavelengths. As a result, this study establishes MoOCl2 as a building block for ultracompact polarization optics.
SN  - 1936-0851
SN  - 1936-086X
ER  -