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Ultrathin Quarter-Waveplates Based on Two-Dimensional Anisotropic NbOCl2
Jia Gao1, Caokun Wang2, Chorng Haur Sow1
1Department of Physics, Faculty of Science, National University of Singapore, 2 Science Drive 3, Singapore, Singapore.
Nature Communications
|March 18, 2026
Summary
Researchers developed ultrathin waveplates using two-dimensional NbOCl₂. These novel waveplates offer precise polarization control for miniaturized optical systems, overcoming limitations of current technologies.
Area of Science:
- Materials Science
- Optics
- Nanotechnology
Background:
- Miniaturized waveplates are crucial for integrated photonic and polarization-resolved optical systems.
- Commercial waveplates face limitations in reduced dimensions due to weak anisotropy, scattering, and surface roughness.
Purpose of the Study:
- To demonstrate ultrathin waveplates based on two-dimensional NbOCl₂.
- To overcome the limitations of conventional waveplates in miniaturized optical systems.
Main Methods:
- Fabrication of ultrathin waveplates using two-dimensional NbOCl₂.
- Characterization of polarization parameters (ellipticity, polarization plane axis) via thickness modulation.
- Evaluation of retardance tolerance across multiple operating wavelengths.
Main Results:
- NbOCl₂ exhibits strong in-plane optical anisotropy and an atomically smooth van der Waals surface.
- Achieved highly compact quarter-waveplates with tuneable polarization parameters.
- Demonstrated exceptional retardance tolerance (<λ/600 to λ/300) and a record-thin 269 nm device at 614 nm.
Conclusions:
- NbOCl₂ is a promising material for subwavelength, high-fidelity polarization optics.
- Offers a scalable route for chip-integrated polarization control in advanced photonic technologies.
