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
Guixin Li (ligx@sustc.edu.cn)
Shuang Zhang (s.zhang@bham.ac.uk)
纸质出版日期:2019,
网络出版日期:2019-01-30,
收稿日期:2018-09-27,
修回日期:2018-12-21,
录用日期:2018-12-24
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Gigantic electric-field-induced second harmonic generation from an organic conjugated polymer enhanced by a band-edge effect[J]. LSA, 2019,8(1):154-159.
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).
Gigantic electric-field-induced second harmonic generation from an organic conjugated polymer enhanced by a band-edge effect[J]. LSA, 2019,8(1):154-159. DOI: 10.1038/s41377-019-0128-z.
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.
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.
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