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Utilization of Plasmonic and Photonic Crystal Nanostructures for Enhanced Micro- and Nanoparticle Manipulation

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Published on: September 27, 2011

Ultrathin Twisted Bilayer Photonic Crystal with Tunable Micron-Level Near-Field Coupling for Multimode Polarization

Yule Wang¹, Jipeng Xu¹, Ning Liu¹

¹College of Advanced Interdisciplinary Studies, National University of Defense Technology, Changsha 410073, China.

|May 26, 2025

Summary

This study introduces ultrathin moiré chiral metasurfaces for advanced polarization control. These novel photonic crystals offer tunable multimode resonances for enhanced optical device applications.

Keywords:

chirality moiré multimode on-site tunability polarization manipulation ultrathin

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Area of Science:

Photonics
Metasurfaces
Chiroptical phenomena

Background:

Moiré chiral metasurfaces are promising for polarization-sensitive applications.
Achieving multimode tunability in these metasurfaces is a significant challenge.

Purpose of the Study:

To present an on-site tunable twisted bilayer photonic crystal (TBPhC) for advanced polarization control.
To demonstrate the potential of deep-subwavelength photonic crystals for flexible manipulation of light polarization.

Main Methods:

Fabrication of TBPhC using two ultrathin silicon nitride photonic crystal films (50 nm thick) stacked into moiré patterns.
Utilizing guided-mode resonances and interlayer coupling to create an optical resonator.
Investigating twist-tunable moiré chiral resonances through adjustment of interlayer distance and twist angle.

Main Results:

Demonstrated enhanced near-field coupling due to deep-subwavelength thickness.
Achieved tuning of multiple resonant modes with micron-level spacing.
Experimentally controlled resonant chiroptical responses and modulated light polarization at the telecom region.

Conclusions:

The ultrathin resonant configuration enables active control of chiroptical responses.
This approach offers new possibilities for dynamic polarization control in optical devices.
The developed TBPhC advances the field of polarization-sensitive optical applications.