ACS Nano· 2026Q1
Deep-Subwavelength and Broadband Quarter-Wave Retardation in Ultrathin Hyperbolic MoOCl2
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- Q1SCImago
- 2026year
Short summary
Ultrathin MoOCl2 flakes (down to 65 nm) achieve achromatic quarter-wave retardation across broad visible and near-infrared (510-900 nm) spectra, overcoming limitations of conventional materials and metasurfaces.
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Key points
- Demonstrated ultrathin MoOCl2 flakes as quarter-wave plates with thicknesses down to 65 nm.
- Achieved achromatic quarter-wave retardation over a broad spectral range (510-900 nm).
- Overcame fundamental thickness and bandwidth limitations of conventional optical materials and metasurfaces.
- Measured a retardance tolerance of λ/4500 at quarter-wave wavelengths.
AI-generated from the title and abstract; the full text is not read.
Abstract
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.
The authors' abstract, as published at the source. ACS Nano, 2026 · DOI ↗
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Field: Electronic, Optical and Magnetic Materials
Electronic, Optical and Magnetic MaterialsMaterials Science