Gigantic electric-field-induced second harmonic generation from an organic conjugated polymer enhanced by a band-edge effect

Shumei Chen; King Fai Li; Guixin Li; Kok Wai Cheah; Shuang Zhang

doi:10.1038/s41377-019-0128-z

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Gigantic electric-field-induced second harmonic generation from an organic conjugated polymer enhanced by a band-edge effect

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- Gigantic electric-field-induced second harmonic generation from an organic conjugated polymer enhanced by a band-edge effect
- Light: Science & Applications Vol. 8, Issue 1, Pages: 154-159(2019)
- Affiliations：
  
  1.School of Physics and Astronomy, University of Birmingham, Birmingham, B15 2TT, UK
  2.Department of Materials Science and Engineering, Shenzhen Institute for Quantum Science and Engineering, Southern University of Science and Technology, Shenzhen, 518055, China
  3.Department of Physics, Hong Kong Baptist University, Kowloon Tong, Hong Kong, China
- Author bio：
  
  Guixin Li (ligx@sustc.edu.cn)
  Shuang Zhang (s.zhang@bham.ac.uk)
- Funds：
- DOI：10.1038/s41377-019-0128-z
  CLC：
- Published：2019，
  
  Published Online：30 January 2019，
  
  Received：27 September 2018，
  
  Revised：21 December 2018，
  
  Accepted：24 December 2018
- Accepted：
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Chen, S. et al. Gigantic electric-field-induced second harmonic generation from an organic conjugated polymer enhanced by a band-edge effect. Light: Science & Applications, 8, 154-159 (2019).
DOI：

Chen, S. et al. Gigantic electric-field-induced second harmonic generation from an organic conjugated polymer enhanced by a band-edge effect. Light: Science & Applications, 8, 154-159 (2019). DOI： 10.1038/s41377-019-0128-z.

摘要

Abstract

Electric-field-induced second harmonic generation (EFISH)

a third-order nonlinear process

arises from the interaction between the electric field of an external bias and that of two incident photons. EFISH can be used to dynamically control the nonlinear optical response of materials and is therefore promising for active nonlinear devices. However

it has been challenging to achieve a strong modulation with EFISH in conventional nonlinear materials. Here

we report a large tunability of an EFISH signal from a subwavelength-thick polymer film sandwiched between a transparent electrode and a metallic mirror. By exploiting the band-edge-enhanced third-order nonlinear susceptibility of the organic conjugated polymer

we successfully demonstrate a gigantic EFISH effect with a modulation ratio up to 422% V

-1

at a pumping wavelength of 840 nm. The band-edge-enhanced EFISH opens new avenues for modulating the intensity of SHG signals and for controlling nonlinear electro-optic interactions in nanophotonic devices.

关键词

Keywords

references

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