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arXiv:1712.02929 · Physical Review A

Generation and amplification of a high-order sideband induced by two-level atoms in a hybrid optomechanical system

Zeng‐Xing Liu, Hao Xiong, Ying Wu

Published Jan 3, 2018• 86 citations
arXivHTMLPDF

Abstract

It is quite important to enhance and control the optomechanically induced high-order sideband generation to achieve low-power optical comb and high-sensitivity sensing with an integrable structure. Here we present and analyze a proposal for enhancement and manipulation of optical nonlinearity and high-order sideband generation in a hybrid atom-cavity optomechanical system that is coherently driven by a bichromatic input field consisting of a control field and a probe field and that works beyond the perturbative regime. Our numerical analysis with experimentally achievable parameters confirms that robust high-order sideband generation and typical spectral structures with nonperturbative features can be created even under weak driven fields. The dependence of the high-order sideband generation on the atomic parameters are also discussed in detail, including the decay rate of the atoms and the coupling parameter between the atoms and the cavity field. We show that the cutoff order as well as the amplitude of the higher-order sidebands can be well tuned by the atomic coupling strength and the atomic decay rate. The proposed mechanism of enhancing optical nonlinearity is quite general and can be adopted to optomechanical systems with different types of cavity.

DOI
10.1103/physreva.97.013801

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It is quite important to enhance and control the optomechanically induced high-order sideband generation to achieve low-power optical comb and high-sensitivity sensing with an integrable structure. Here we present and analyze a proposal for enhancement and manipulation of optical nonlinearity and high-order sideband generation in a hybrid atom-cavity optomechanical system that is coherently driven by a bichromatic input field consisting of a control field and a probe field and that works beyond the perturbative regime. Our numerical analysis with experimentally achievable parameters confirms that robust high-order sideband generation and typical spectral structures with nonperturbative features can be created even under weak driven fields. The dependence of the high-order sideband generation on the atomic parameters are also discussed in detail, including the decay rate of the atoms and the coupling parameter between the atoms and the cavity field. We show that the cutoff order as well as the amplitude of the higher-order sidebands can be well tuned by the atomic coupling strength and the atomic decay rate. The proposed mechanism of enhancing optical nonlinearity is quite general and can be adopted to optomechanical systems with different types of cavity.
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We propose an efficient scheme to enhance the generation of optical second-order sidebands (OSSs) in an atom-assisted optomechanical system. The cavity field is coupled with a strong driving field and a weak probe field, and a control field is applied to the atom. We use the steady-state method to analyze the nonlinear interaction in the system, which is different from the traditional linear analysis method. The existence of an auxiliary three-level atom driven by the control field significantly enhances the generation of an OSS. It is found that the efficiency of the OSS can be effectively modulated by adjusting the Rabi frequency of the control field, optomechanical cooperativity and atomic coupling strength. Our scheme provides a promising solution for controlling light propagation and has potential application in quantum optical devices and quantum information networks.
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Optical microresonators can greatly enhance light-matter interactions and reduce the power necessary to observe nonlinear optical effects. Manipulation and application of atom-resonator-coupling-induced strong nonlinearity have received much attention in recent years. Here, we present a scheme to realize quantum-squeezing-engineered third-order Kerr nonlinearity and optical high-order sideband comb in a composite system consisting of a two-level atom and two directly coupled whispering-gallery-mode optical microresonators. By quantum squeezing one of two coupled resonator modes in this system, the effective resonator-resonator and atom-resonator coupling rates as well as the frequency of the squeezed resonator mode can be effectively controlled. Based on this mechanism, we show that the Kerr nonlinearity of the composite system can be effectively engineered by using the resonator-mode squeezing when the system is monochromatically driven beyond the weak-excitation limit. On the other hand, when the composite system is bichromatically driven, the optical high-order sideband combs formed in the transmission spectra of the system can also be effectively engineered by the resonator-mode squeezing. Therefore, our scheme provides a novel mechanism to control the physical properties of composite resonator-atom systems for various applications, and demonstrates that optical nonlinear effects induced by the atom-resonator coupling can be effectively engineered via quantum squeezing.
The nonlinearity of magnons plays an important role in the study of an optomagnonical system. Here in this paper, we focus on the high-order sideband and frequency comb generation characteristics in the atom coupled optomagnonical resonator. We find that the atom-cavity coupling strength is related to the nonlinear coefficients, and the efficiency of sidebands generation could be reinforced by tuning the polarization of magnons. Besides, we show that the generation of the sidebands could be suppressed under the large dissipation condition. This study provides a novel way to engineer the low-threshold high-order sidebands in hybrid optical microcavities.