Nanosecond mid-infrared pulse generation via modulated thermal emissivity

Yuzhe Xiao; Nicholas A. Charipar; Jad Salman; Alberto Piqué; Mikhail A. Kats

doi:10.1038/s41377-019-0158-6

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Nanosecond mid-infrared pulse generation via modulated thermal emissivity

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- Nanosecond mid-infrared pulse generation via modulated thermal emissivity
- Light: Science & Applications Vol. 8, Issue 5, Pages: 726-733(2019)
- Affiliations：
  
  1.Department of Electrical and Computer Engineering, University of Wisconsin-Madison, Madison, WI 53706, USA
  2.Naval Research Laboratory, 4555 Overlook Ave. SW, Washington, DC 20375, USA
  3.Department of Materials Science and Engineering, University of Wisconsin-Madison, Madison, WI 53706, USA
  4.Department of Physics, University of Wisconsin-Madison, Madison, WI 53706, USA
- Author bio：
  
  Mikhail A. Kats (mkats@wisc.edu)
- Funds：
- DOI：10.1038/s41377-019-0158-6
  CLC：
- Published：2019，
  
  Published Online：05 June 2019，
  
  Received：19 November 2018，
  
  Revised：01 May 2019，
  
  Accepted：07 May 2019
- Accepted：
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Beliu, G. & Sauer, M. A Trojan Horse for live-cell super-resolution microscopy. Light: Science & Applications, 8, 8-9 (2019).
DOI：

Beliu, G. & Sauer, M. A Trojan Horse for live-cell super-resolution microscopy. Light: Science & Applications, 8, 8-9 (2019). DOI： 10.1038/s41377-019-0158-6.

摘要

Abstract

We demonstrate the generation of nanosecond mid-infrared pulses via fast modulation of thermal emissivity enabled by the absorption of visible pump pulses in unpatterned silicon and gallium arsenide. The free-carrier dynamics in these materials result in nanosecond-scale modulation of thermal emissivity

which leads to nanosecond pulsed thermal emission. To our knowledge

the nanosecond thermal-emissivity modulation in this work is three orders of magnitude faster than what has been previously demonstrated. We also indirectly observed subnanosecond thermal pulses from hot carriers in semiconductors. The experiments are well described by our multiphysics model. Our method of converting visible pulses into the mid infrared using modulated emissivity obeys different scaling laws and can have significant wavelength tunability compared to approaches based on conventional nonlinearities.

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references

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