Controllable optical response by modifying the gain and loss of a mechanical resonator and cavity mode in an optomechanical system
Controllable optical response by modifying the gain and loss of a mechanical resonator and cavity mode in an optomechanical system
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通过修改光机械系统中机械谐振器和腔模式的增益和损耗来控制光学响应
DOI：
10.1103/physreva.95.013843
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发表时间：
2016-09
影响因子：
2.9
通讯作者：
Liu Yu-xi
中科院分区：
文献类型：
--
作者：
Liu Yu-Long;Wu Rebing;Zhang Jing;Ozdemir Sahin Kaya;Yang Lan;Nori Franco;Liu Yu-xi
本文从理论上研究了由无源光腔和有源机械谐振腔组成的强驱动光机系统。当光机耦合强度变化时，观察到相变，这是类似于在$\mathcal{PT}$-对称系统中观察到的。通过改变机械谐振器的增益和光腔模的损耗，可以控制光的传输。特别是，我们发现：（i）对于平衡的增益和损耗，可以通过控制场改变光机械耦合强度来调谐光放大和吸收;（ii）对于不平衡的增益和损耗，即使具有微小的机械增益，也可以在临界点附近观察到光机械诱导的透明和反常色散，这表现出超长的群延迟。通过控制场调节光机耦合强度可以优化时间延迟$\tau$，与传统光机系统的时间延迟（$\tau\sim1 $ $\mu\mathrm{s}$）相比，时间延迟可提高几个数量级（$\tau\sim2 $ $\mathrm{ms}$）。机械增益的存在使得群延迟对环境扰动更鲁棒。我们的建议提供了一个强大的平台，以控制光传输使用$\mathcal{PT}$-类光学机械系统。
We theoretically study a strongly-driven optomechanical system which consists of a passive optical cavity and an active mechanical resonator. When the optomechanical coupling strength is varied, phase transitions, which are similar those observed in $\mathcal{PT}$-symmetric systems, are observed. We show that the optical transmission can be controlled by changing the gain of the mechanical resonator and loss of the optical cavity mode. Especially, we find that: (i) for balanced gain and loss, optical amplification and absorption can be tuned by changing the optomechanical coupling strength through a control field; (ii) for unbalanced gain and loss, even with a tiny mechanical gain, both optomechanically-induced transparency and anomalous dispersion can be observed around a critical point, which exhibits an ultra-long group delay. The time delay $\tau$ can be optimized by regulating the optomechanical coupling strength through the control field and improved up to several orders of magnitude ($\tau\sim2$ $\mathrm{ms}$) compared to that of conventional optomechanical systems ($\tau\sim1$ $\mu\mathrm{s}$). The presence of mechanical gain makes the group delay more robust to environmental perturbations. Our proposal provides a powerful platform to control light transport using a $\mathcal{PT}$-symmetric-like optomechanical system.
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