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Updated: Jun 4, 2025

High-Contrast and Fast Photorheological Switching of a Twist-Bend Nematic Liquid Crystal
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Ultrafast Thermal Switching Enabled by Transient Polaritons.

Bei Yang1, Bai Song2,3, F Javier García de Abajo4,5

  • 1School of Materials Science and Engineering, Shanghai Jiao Tong University, Shanghai 200240, China.

ACS Nano
|December 27, 2024
PubMed
Summary

Researchers developed an ultrafast thermal switch using transient polaritons. This novel design achieves a high switching ratio and picosecond response times, significantly advancing thermal management and cooling technologies.

Keywords:
laser coolingnear-field radiative heat transfertransient polaritonstwo-dimensional materialsultrafast thermal switch

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Area of Science:

  • Nanoscale thermal management
  • Solid-state physics
  • Optoelectronics

Background:

  • Conventional thermal switches struggle with picosecond response times needed for advanced applications.
  • Existing radiative thermal switches face challenges in modulating heat transfer across vacuum gaps.

Purpose of the Study:

  • To propose and demonstrate an ultrafast thermal switch design overcoming limitations of current technologies.
  • To leverage pump-driven transient polaritons for rapid thermal modulation.

Main Methods:

  • Utilized asymmetric terminals with WSe2 and graphene.
  • Employed ultrafast photoexcitation to activate transient polaritons.
  • Investigated dynamic polaritonic coupling for thermal switching.

Main Results:

  • Achieved a thermal switching ratio exceeding 10,000.
  • Demonstrated response times on the picosecond scale, outperforming existing designs by over two orders of magnitude.
  • Observed a laser cooling effect in a WSe2 monolayer-based switch.

Conclusions:

  • Photodriven transient polaritons offer a promising pathway for ultrafast thermal switches.
  • This technology has significant potential for advancing nanoscale cooling and thermal management in solid-state applications.