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Updated: Feb 23, 2026

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Tailoring Eigenmodes at Spectral Singularities in Graphene-based PT Systems.

Weixuan Zhang1, Tong Wu1, Xiangdong Zhang2

  • 1Beijing Key Laboratory of Nanophotonics & Ultrafine Optoelectronic Systems, School of Physics, Beijing Institute of Technology, Beijing, 100081, China.

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|September 14, 2017
PubMed
Summary
This summary is machine-generated.

Researchers explored spectral singularities in hybrid systems. They found that both lasing and absorption modes can be excited, offering new possibilities for plasmon lasers and enhanced spectroscopies.

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Area of Science:

  • Plasmonics
  • Quantum Optics
  • Materials Science

Background:

  • PT-synthetic systems typically exhibit only lasing modes due to passive metallic materials.
  • Spectral singularities are a key phenomenon in PT-synthetic plasmonic systems.

Purpose of the Study:

  • Investigate spectral singularities in a novel hybrid structure.
  • Explore the excitation of both lasing and absorption modes.
  • Analyze the tunability of optical modes for potential applications.

Main Methods:

  • Utilized a hybrid structure combining photoexcited graphene and a one-dimensional PT-diffractive grating.
  • Investigated the role of graphene's surface conductivity (loss and gain).
  • Analyzed the impact of grating loss/gain imbalance on spectral singularities.

Main Results:

  • Demonstrated the excitation of both lasing and absorption modes by controlling graphene's conductivity.
  • Observed the disappearance of spectral singularities when graphene becomes lossless.
  • Showcased symmetry-mode excitation in spectral singularities with unbalanced grating loss/gain.
  • Tuned graphene loss/gain and grating properties to control optical modes.

Conclusions:

  • Tunable optical modes at spectral singularities can be achieved in graphene-PT grating hybrid systems.
  • This tunability opens avenues for designing advanced surface-enhanced spectroscopies.
  • Potential applications include the development of novel plasmon lasers.