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The quadrupole mass analyzer consists of four cylindrical metal rods arranged in a diamond carrying a DC voltage and a radio-frequency AC voltage. The motion of ions through the quadrupole depends on the field strength, causing only ions of a certain m/z to resonate successfully and strike the detector at a given field strength. Though the transmission rate for these analyzers is high, the exact elemental composition of the sample is not determined because of low resolution; however, they are...
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Defect-evolved quadrupole higher-order topological nanolasers.

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We demonstrate photonic quadrupole topological phases activated by defect evolution, enabling nanoscale lasing. This research opens new avenues for topological light confinement and modulation in photonic devices.

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Area of Science:

  • Topological photonics
  • Condensed matter physics
  • Nanophotonics

Background:

  • Higher-order topological insulators generalize topological photonics.
  • They enable strong light confinement at lower-dimensional boundaries.
  • This facilitates novel topological phenomena and nanoscale light sources.

Purpose of the Study:

  • To reveal photonic quadrupole topological phases activated by defect evolution.
  • To demonstrate nanoscale lasing operation within this paradigm.
  • To explore new routes for topological phase transitions in photonics.

Main Methods:

  • Constructing a quadrupole higher-order topological nanocavity using two distinct photonic crystal slabs.
  • Engineering opposite directions of defect evolution in the slabs.
  • Experimental demonstration of lasing operation.

Main Results:

  • Stable single-mode emission achieved from the defect-evolved quadrupole topological nanolaser.
  • Low lasing threshold observed in the telecom C-band.
  • Room-temperature operation demonstrated.

Conclusions:

  • Photonic quadrupole topological phase transitions can be activated by defect evolution.
  • This provides an intriguing route for topological light confinement and modulation.
  • Enables new possibilities for topology-driven nanoscale light sources.