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Ionic Crystal Structures

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Updated: Jun 22, 2026

Atomically Defined Templates for Epitaxial Growth of Complex Oxide Thin Films

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Published on: December 4, 2014

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

This summary is machine-generated.

Researchers developed ultrathin waveplates using two-dimensional NbOCl₂. These novel waveplates offer precise polarization control for miniaturized optical systems, overcoming limitations of current technologies.

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Last Updated: Jun 22, 2026

Atomically Defined Templates for Epitaxial Growth of Complex Oxide Thin Films

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Published on: December 4, 2014

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Published on: February 9, 2017

Probe Type II Band Alignment in One-Dimensional Van Der Waals Heterostructures Using First-Principles Calculations

Probe Type II Band Alignment in One-Dimensional Van Der Waals Heterostructures Using First-Principles Calculations

Published on: October 12, 2019

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.