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Optically Tunable Transient Plasmons in InSb Nanowires.

Mengfei Xue1,2,3, Dong Pan4, Jianhua Zhao4

  • 1Wenzhou Institute, University of Chinese Academy of Sciences, Wenzhou, Zhejiang, 325001, China.

Advanced Materials (Deerfield Beach, Fla.)
|January 23, 2023
PubMed
Summary
This summary is machine-generated.

Ultrafast optical switching of semiconductor plasmons was achieved using indium antimonide (InSb) nanowires. This demonstrates their potential for high-speed mid-infrared plasmonic devices in future informatic technologies.

Keywords:
InSb nanowiresplasmonpump-probes-SNOMsmall-bandgap semiconductors

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Area of Science:

  • Nanophotonics
  • Materials Science
  • Optoelectronics

Background:

  • Optical carrier incubation modifies semiconductor electron transport properties.
  • Semiconductor nanostructures offer high photoinduced electron injection efficiency for ultrafast light manipulation.
  • Indium antimonide (InSb) nanowires are promising mid-infrared plasmonic materials due to high electron mobility.

Purpose of the Study:

  • Investigate pump fluence dependency and non-equilibrium plasmon dynamics in InSb nanowires.
  • Demonstrate optical switching of plasmonic response in InSb.
  • Explore tuning of plasmon frequency via photoinduced electron injection.

Main Methods:

  • Pump-probe nanoscopy was employed to study InSb nanowires.
  • Investigated the effect of varying pump fluence on plasmonic properties.
  • Measured photoinduced electron density and plasmon damping rates.

Main Results:

  • Successfully switched the InSb plasmon response by injecting photoinduced electrons.
  • Achieved a one-octave tuning of plasmon frequency by increasing pump fluence to 90 µJ cm⁻².
  • Observed a high photoinduced electron density (18.8 × 10¹⁸ cm⁻³) and low plasmon damping rate (≈200 cm⁻¹).

Conclusions:

  • InSb nanowires exhibit excellent plasmonic properties for ultrafast optical switching.
  • Demonstrated practical tuning of plasmon frequency, enabling nanoscale light manipulation.
  • InSb nanowires are a promising platform for high-speed mid-infrared plasmonic materials in informatic devices.