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Channel Rhodopsins01:11

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Most organisms use photoreceptors to sense and respond to light. Examples of photoreceptors include bacteriorhodopsins and bacteriophytochromes in some bacteria, phytochromes in plants, and rhodopsins in the photoreceptor cells of the vertebral retina. The light-sensitive property of these receptors is because of the bound chromophores, such as bilin in the phytochromes and retinal in the rhodopsins.
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In-situ Tapering of Chalcogenide Fiber for Mid-infrared Supercontinuum Generation
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Reconfigurable chalcogenide integrated nonlinear photonics.

Di Xia1,2, Liyang Luo1,2, Linyi Wang1,2

  • 1Guangdong Provincial Key Laboratory of Optoelectronic Information Processing Chips and Systems, School of Electrical and Information Technology, Sun Yat-sen University, Guangzhou, 510275, China.

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|November 19, 2025
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Summary
This summary is machine-generated.

Researchers developed reconfigurable integrated GeSbS microresonators. This breakthrough allows dynamic dispersion engineering for versatile nonlinear photonic devices, enabling new applications in lasers and light sources.

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Area of Science:

  • Photonics
  • Materials Science
  • Nonlinear Optics

Background:

  • Integrated photonics leverages nonlinear optics for advanced light sources.
  • Modifying dispersion in nonlinear photonic devices post-fabrication is a significant challenge.
  • Dispersion dictates phase-matching conditions crucial for nonlinear optical processes.

Purpose of the Study:

  • To present integrated GeSbS microresonators with arbitrarily reconfigurable dispersion profiles.
  • To demonstrate a method for dynamic dispersion engineering in integrated photonics.
  • To enable scalable and reconfigurable nonlinear devices for diverse applications.

Main Methods:

  • Utilized intracavity backscattering to generate standing wave patterns.
  • Imprinted or erased Bragg gratings along microresonators via photosensitivity.
  • Synthesized tunable dispersion from strongly coupled bidirectional resonances via Bragg gratings.

Main Results:

  • Achieved arbitrary and dynamic reconfiguration of microresonator dispersion profiles.
  • Demonstrated tunable dispersion for adjusting parametric oscillator sidebands.
  • Enabled spectral flattening of Kerr microcombs and deterministic generation of Brillouin lasers.

Conclusions:

  • The developed GeSbS microresonators offer unprecedented control over dispersion.
  • This technique paves the way for reprogrammable nonlinear photonic devices.
  • The approach supports scalable integration and broad applicability in photonics.