Broadband THz absorption spectrometer based on excitonic nonlinear optical effects

Avan Majeed; Pavlo Ivanov; Benjamin Stevens; Edmund Clarke; Iain Butler; David Childs; Osamu Kojima; Richard Hogg

doi:10.1038/s41377-019-0137-y

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Broadband THz absorption spectrometer based on excitonic nonlinear optical effects

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- Broadband THz absorption spectrometer based on excitonic nonlinear optical effects
- Light: Science & Applications Vol. 8, Issue 2, Pages: 226-230(2019)
- Affiliations：
  
  1.Department of Electronic and Electrical Engineering, University of Sheffield, Sheffield, S1 4DE, UK
  2.School of Engineering, University of Glasgow, Glasgow, G12 8LT, UK
  3.EPSRC National Centre for III-V Technologies, University of Sheffield, Broad Lane, Sheffield, S3 7HQ, UK
  4.Department of Electrical and Electronic Engineering, Graduate School of Engineering, Kobe University, 1-1 Rokkodai, Nada, Kobe, 657-8501, Japan
- Author bio：
  
  Richard Hogg (Richard.Hogg@glasgow.ac.uk)
- Funds：
- DOI：10.1038/s41377-019-0137-y
  CLC：
- Published：2019，
  
  Published Online：13 March 2019，
  
  Received：24 April 2018，
  
  Revised：28 January 2019，
  
  Accepted：11 February 2019
- Accepted：
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Majeed, A. et al. Broadband THz absorption spectrometer based on excitonic nonlinear optical effects. Light: Science & Applications, 8, 226-230 (2019).
DOI：

Majeed, A. et al. Broadband THz absorption spectrometer based on excitonic nonlinear optical effects. Light: Science & Applications, 8, 226-230 (2019). DOI： 10.1038/s41377-019-0137-y.

摘要

Abstract

A broadly tunable THz source is realized via difference frequency generation

in which an enhancement to χ

(3)

that is obtained via resonant excitation of Ⅲ-Ⅴ semiconductor quantum well excitons is utilized. The symmetry of the quantum wells (QWs) is broken by utilizing the built-in electric-field across a p-i-n junction to produce effective χ

(2)

processes

which are deri

ved from the high χ

(3)

. This χ

(2)

media exhibits an onset of nonlinear processes at ~4 W cm

-2

thereby enabling area (and

hence

power) scaling of the THz emitter. Phase matching is realized laterally through normal incidence excitation. Using two collimated 130 mW continuous wave (CW) semiconductor lasers with ~1-mm beam diameters

we realize monochromatic THz emission that is tunable from 0.75 to 3 THz and demonstrate the possibility that this may span 0.2-6 THz with linewidths of ~20 GHz and efficiencies of ~1 × 10

-5

thereby realizing ~800 nW of THz power. Then

transmission spectroscopy of atmospheric features is demonstrated

thereby opening the way for compact

low-cost

swept-wavelength THz spectroscopy.

关键词

Keywords

references

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