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Related Experiment Video

Updated: May 20, 2025

Fabricating van der Waals Heterostructures with Precise Rotational Alignment

Fabricating van der Waals Heterostructures with Precise Rotational Alignment

Published on: July 5, 2019

Engineering shear polaritons in 2D twisted heterostructures.

Lei Zhou¹, Xiang Ni², Zerui Wang¹

¹MOE Key Laboratory of Advanced Micro-Structured Materials, Shanghai Frontiers Science Center of Digital Optics, Institute of Precision Optical Engineering, and School of Physics Science and Engineering, Tongji University, Shanghai, China.

Nature Communications

|March 27, 2025

Summary

Researchers engineered hyperbolic shear polaritons (HShPs) in 2D materials for nanoscale light control. By tuning twisted $\alpha$-MoO$_{3}$ bilayers and using graphene gates, they achieved unprecedented dynamic manipulation of these light-matter interactions.

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A Standard and Reliable Method to Fabricate Two-Dimensional Nanoelectronics

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Published on: August 28, 2018

Area of Science:

Condensed Matter Physics
Materials Science
Nanophotonics

Background:

Polaritons with extreme optical anisotropy are key for nanoscale light manipulation.
Hyperbolic shear polaritons (HShPs) arise in low-symmetry materials but are difficult to control.
Existing methods rely on bulk materials with inherent symmetry limitations.

Purpose of the Study:

To engineer and control HShPs in two-dimensional (2D) materials.
To overcome the limitations of bulk materials for HShP manipulation.
To enable dynamic control over HShPs for advanced nanophotonic applications.

Main Methods:

Utilized twisted bilayers of $\alpha$-MoO$_{3}$, a 2D material without inherent broken lattice symmetry.
Employed infrared nanoimaging to observe and analyze HShP behavior.
Integrated a graphene electrostatic gate for dynamic HShP manipulation.

Main Results:

Demonstrated precise control over HShP asymmetry in propagation and loss redistribution.
Achieved tunable confinement of HShPs by adjusting bilayer thickness and twist angle.
Showcased dynamic modulation of HShPs using a graphene gate.

Conclusions:

Engineered HShPs in 2D $\alpha$-MoO$_{3}$ bilayers offer a versatile platform for polaritonics.
The developed methods enable customizable control over HShP properties.
This work advances on-chip photonic applications by expanding HShP capabilities.