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arXiv · 1903.01770

An Exciton-Polariton Fano Resonance Driven by Second Harmonic Generation

Yafeng Wang·Liming Liao·Tao Hu·Song Luo·Lin Wu·Jun Wang·Zhe Zhang·Wei Xie·Liaoxin Sun·A. V. Kavokin·Xuechu Shen·Zhanghai Chen
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Abstract

Angle-resolved second harmonic generation (SHG) spectra of ZnO microwires show characteristic Fano resonances in the spectral vicinity of exciton-polariton modes. The output SHG spectra after SHG interacting with exciton polariton shows a resonant enhancement peak accompanied by a suppression dip originating from the constructive and destructive interference respectively. It is demonstrated that the Fano line shape, and thus the Fano asymmetry parameter q, can be tuned by the phase-shift of the two channels. The phase-dependent q was calculated and the model describes our experimental results well. In particular, the phase-to-q relation unveil the crucial information about the dynamics of the system, e.g., defining the line shape of output SHG spectra in a superposition of quantum states.

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Yafeng Wang, Liming Liao, Tao Hu, Song Luo, Lin Wu, Jun Wang, Zhe Zhang, Wei Xie, Liaoxin Sun, A. V. Kavokin, Xuechu Shen, Zhanghai Chen. 2019-03-05. An Exciton-Polariton Fano Resonance Driven by Second Harmonic Generation. https://doi.org/10.1103/physrevlett.118.063602

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