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Fabrication of 1-D Photonic Crystal Cavity on a Nanofiber Using Femtosecond Laser-induced Ablation

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Photonic Disclination Nanocavities with Versatile Rotational Symmetries.

Zihang Cui^1,2,3, Wei Guo^1,2, Xing Hong¹

¹Electronic Information School, Wuhan University, Wuhan 430072, China.

|July 7, 2025

Summary

We engineered photonic disclination nanocavities with tunable symmetries, creating highly confined optical states. This breakthrough enables stable single-mode lasers, paving the way for advanced nanophotonic devices.

Keywords:

Voronoi index disclination photonic nanocavity rotational symmetry strong mode localization

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Area of Science:

Photonics
Condensed Matter Physics
Nanotechnology

Background:

Topological defects called disclinations are known in condensed matter and wave systems.
Their formation is usually limited by atomic forces or lattice symmetries, restricting tunability.

Purpose of the Study:

To engineer photonic disclination nanocavities with versatile rotational symmetries.
To overcome limitations of natural systems for defect formation and tunability.
To demonstrate a semiconductor nanocavity laser utilizing these engineered defects.

Main Methods:

Utilized a symmetry-unconstrained Volterra process to create photonic disclination nanocavities.
Performed systematic analysis of structural geometry, intercell coupling, and eigenmodes.
Fabricated and characterized a semiconductor nanocavity laser.

Main Results:

Engineered nanocavities host tightly confined optical states within the photonic bandgap.
Demonstrated a semiconductor nanocavity laser with stable single-mode emission.
Achieved a high-quality factor (Q) disclination state with a near-diffraction-limited mode volume.

Conclusions:

Disclination states with diverse discrete symmetries can be rationally designed for exceptional optical confinement.
These synthetic disclinations offer a versatile platform for next-generation nanophotonic devices.
The engineered defects enable tailored functionalities in photonic applications.