Giant All-Optical Modulation of Second-Harmonic Generation Mediated by Dark Excitons

doi:10.1021/acsphotonics.1c00466

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	Giant All-Optical Modulation of Second-Harmonic Generation Mediated by Dark Excitons
	Y. Wang; S. Das; F. Iyikanat; Y. Dai; S. Li; X. Guo; X. Yang; J. Cheng; X. Hu; M. Ghotbi; F. Ye; H. Lipsanen; S. Wu; T. Hasan; X. Gan; K. Liu; D. Sun; Q. Dai; F. J. Garcia De Abajo; J. Zhao and Z. Sun
	2021
发表期刊	ACS Photonics
ISSN	23304022
卷号	8 期号:8 页码:2320-2328
摘要	All-optical control of nonlinear photonic processes in nanomaterials is of significant interest from a fundamental viewpoint and with regard to applications ranging from ultrafast data processing to spectroscopy and quantum technology. However, these applications rely on a high degree of control over the nonlinear response, which still remains elusive. Here, we demonstrate giant and broadband all-optical ultrafast modulation of second-harmonic generation (SHG) in monolayer transition-metal dichalcogenides mediated by the modified excitonic oscillation strength produced upon optical pumping. We reveal a dominant role of dark excitons to enhance SHG by up to a factor of 386 at room temperature, 2 orders of magnitude larger than the current state-of-the-art all-optical modulation results. The amplitude and sign of the observed SHG modulation can be adjusted over a broad spectral range spanning a few electronvolts with ultrafast response down to the sub-picosecond scale via different carrier dynamics. Our results not only introduce an efficient method to study intriguing exciton dynamics, but also reveal a new mechanism involving dark excitons to regulate all-optical nonlinear photonics.
DOI	10.1021/acsphotonics.1c00466
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收录类别	SCI ; EI
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文献类型	期刊论文
条目标识符	http://ir.ciomp.ac.cn/handle/181722/65272
专题	中国科学院长春光学精密机械与物理研究所
推荐引用方式 GB/T 7714	Y. Wang,S. Das,F. Iyikanat,et al. Giant All-Optical Modulation of Second-Harmonic Generation Mediated by Dark Excitons[J]. ACS Photonics,2021,8(8):2320-2328.
APA	Y. Wang.,S. Das.,F. Iyikanat.,Y. Dai.,S. Li.,...&J. Zhao and Z. Sun.(2021).Giant All-Optical Modulation of Second-Harmonic Generation Mediated by Dark Excitons.ACS Photonics,8(8),2320-2328.
MLA	Y. Wang,et al."Giant All-Optical Modulation of Second-Harmonic Generation Mediated by Dark Excitons".ACS Photonics 8.8(2021):2320-2328.

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