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Infrared Physics & Technology

Optical bistability in Rydberg linear and nonlinear processes

Junling Che, Wenqi Xu, Yuhang Gao, M. X. Bi, Xun Lu, Ming‐Liang Hu

Published Jun 19, 2023• 2 citations
Publisher
DOI
10.1016/j.infrared.2023.104794

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The optical bistability of a triangular quantum dot molecules embedded inside a unidirectional ring cavity is studied. The type, the threshold and the hysteresis loop of the optical bistability curves can be modified by the tunneling parameters, as well as the probe laser field. The linear and nonlinear susceptibilities of the medium are also studied to interpret the corresponding results. The physical interpretation is that the tunneling can induce the quantum interference, which modifies the linear and the nonlinear response of the medium. As a consequence, the characteristics of the optical bistability are changed. The scheme proposed here can be utilized for optimizing and controlling the optical switching process.
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In this work, we have investigated a phase transition and optical bistability in a cold [Formula: see text]Rb sample excited to the [Formula: see text] Rydberg state, using absorption spectroscopy while scanning the Rydberg excitation laser for [Formula: see text]. The system is characterized through its dependence on the Rydberg Rabi frequency and principal quantum number, exhibiting hysteretic behavior indicative of bistability. We further analyze its time evolution, revealing the characteristic dynamics of the transition between stable states. The results are consistent with optical bistability induced by a cold plasma in the presence of Rydberg blockade. This work demonstrates the role of collective many-body interactions in establishing nonlinear optical responses in strongly interacting Rydberg ensembles.