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Trapping of Micro Particles in Nanoplasmonic Optical Lattice

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Spin and Orbital Angular Momentum Lasing from Phase-gradient Plasmonic Lattices.

Chuchuan Hong¹, Zhaoyun Zheng¹, Shreya K Patel¹

¹Department of Chemistry, Northwestern University, Evanston, IL, 60208, USA.

Nature Communications

|November 26, 2025

Summary

Researchers developed plasmonic cavities for tunable lasing emission. This breakthrough enables simultaneous control over polarization and beam profiles, advancing optical technologies by engineering light properties within a single cavity.

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Area of Science:

Optics and Photonics
Materials Science
Nanotechnology

Background:

Controlling polarization, wavefront, and directionality of lasing emission is crucial for optical technologies.
Independent tunability of these characteristics in a single cavity remains a significant challenge.
Dielectric metasurfaces offer wavefront control but often lack high-quality cavity modes for lasing.

Purpose of the Study:

To demonstrate plasmonic cavities capable of supporting phase-gradient lattice resonances.
To achieve strong coupling between excitons and chiral cavity modes for tunable lasing.
To enable simultaneous control over spin and orbital angular momentum in laser beams.

Main Methods:

Utilizing plasmonic cavities to support phase-gradient lattice resonances.
Employing Cadmium Selenide (CdSe) nanoplatelets for exciton coupling.
Engineering localized plasmons to manipulate phase singularities and geometric phase.

Main Results:

Achieved unity circular polarization at engineered Fourier space positions.
Demonstrated strong exciton-cavity coupling, yielding photoluminescence with near-unity chirality.
Obtained low-threshold, simultaneous lasing from multiple beams with tunable angles.

Conclusions:

Plasmonic cavities can support engineered phase-gradient lattice resonances for lasing.
Strong coupling enables generation of chiral light with tunable properties.
This work highlights the potential of localized plasmons for precise control of light angular momentum.