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Related Concept Videos

Standing Waves in a Cavity01:28

Standing Waves in a Cavity

A household microwave and lasers are examples of standing electromagnetic waves in a cavity. When two conducting metal plates are placed parallel at the nodal planes, it creates a cavity where standing waves are formed. The cavity between the two planes is analogous to a stretched string held at the points x = 0 and x = L. Here, the distance 'L' between the two planes must be an integer multiple of half of the wavelength. The wavelengths that satisfy this condition are given by:

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Related Experiment Video

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Fabrication of 1-D Photonic Crystal Cavity on a Nanofiber Using Femtosecond Laser-induced Ablation
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Ultralow-Threshold Lasing in a Nanobeam Cavity Using Topological Interface State.

Xiqing Chen1, Hancong Li1, Zhikai Ma1

  • 1State Key Laboratory for Mesoscopic Physics and Frontiers Science Center for Nano-optoelectronics, School of Physics, Peking University, Beijing 100871, China.

Nano Letters
|July 14, 2026
PubMed
Summary

Researchers developed an ultralow-threshold topological nanolaser using a Su-Schrieffer-Heeger (SSH) nanobeam. This innovation in integrated photonics significantly lowers lasing thresholds for advanced optical devices.

Keywords:
Nanobeam CavityTopological Interface StateTopological NanolaserUltralow-Threshold Lasing

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Area of Science:

  • Photonics
  • Condensed Matter Physics
  • Quantum Optics

Background:

  • Achieving ultralow-threshold lasing is crucial for integrated photonics.
  • Topological states offer unique properties for robust light confinement.

Purpose of the Study:

  • To demonstrate an ultralow-threshold nanolaser utilizing a topological Su-Schrieffer-Heeger (SSH) nanobeam interface state.
  • To enhance cavity-gain coupling and improve performance through structural optimization.

Main Methods:

  • Fabrication of nanobeam cavities with embedded semiconductor quantum dots at an SSH interface.
  • Modification of the SSH interface by removing the central hole to optimize the topological cavity mode.
  • Characterization of lasing performance under continuous-wave and pulsed excitation.

Main Results:

  • Ultralow threshold achieved: ~640 nW (CW) and ~62 μW (pulsed).
  • Preservation of topological cavity mode with improved quality factor and maintained small mode volume.
  • Enhanced cavity-gain coupling, increasing the high-field fraction in the semiconductor by ~20%.

Conclusions:

  • The optimized SSH interface nanobeam enables ultralow-threshold topological lasing.
  • The design demonstrates enhanced light-matter interaction for efficient nanolasers.
  • Photon-correlation measurements indicate delayed coherence buildup above threshold.