近日，印度理工学院古瓦哈提分校的Tarak N. Dey及其研究小组与印度TCG科技研究和教育中心的Subhadeep Chakraborty合作并取得一项新进展。经过不懈努力，他们对腔磁力学中增益辅助的可控快光产生过程进行了研究。相关研究成果已于2023年9月22日在国际知名学术期刊《物理评论A》上发表。

该研究团队研究了由两个耦合微波谐振腔组成的腔磁力谐振腔系统可控输出场的产生。第一个腔体与铁磁钇铁石榴石（YIG）球相互作用，提供磁子-光子耦合。在无源腔结构下，系统表现出高吸收性，即使色散响应异常也禁止输出传输。为了克服高吸收，研究人员用一个主动腔代替第二个被动腔，从而在系统中产生有效增益。他们证明了YIG球的变形保留了异常色散。

此外，调整两个谐振器之间的交换相互作用强度导致系统产生有效增益和色散响应。因此，与探测脉冲的放大相关的推进可以在磁力共振附近进行控制。

此外，研究人员还发现，探测脉冲强度放大和推进的上界确实存在，这是由稳定条件所导致的。这些发现有可能为控制光在腔磁力学中的传播提供潜在的应用。

附：英文原文

Title: Gain-assisted controllable fast-light generation in cavity magnomechanics

Author: Sanket Das, Subhadeep Chakraborty, Tarak N. Dey

Issue&Volume: 2023/09/22

Abstract: We study the controllable output field generation from a cavity magnomechanical resonator system that consists of two coupled microwave resonators. The first cavity interacts with a ferrimagnetic yttrium iron garnet (YIG) sphere providing the magnon-photon coupling. Under a passive cavities configuration, the system displays high absorption, prohibiting output transmission even though the dispersive response is anomalous. We replace the second passive cavity with an active one to overcome high absorption, producing an effective gain in the system. We show that the deformation of the YIG sphere retains the anomalous dispersion. Further, tuning the exchange interaction strength between the two resonators leads to the system's effective gain and dispersive response. As a result, the advancement associated with the amplification of the probe pulse can be controlled in the proximity of the magnomechanical resonance. Furthermore, we find the existence of an upper bound for the intensity amplification and the advancement of the probe pulse that comes from the stability condition. These findings may find potential applications for controlling light propagation in cavity magnomechanics.

DOI: 10.1103/PhysRevA.108.033517

Source: https://journals.aps.org/pra/abstract/10.1103/PhysRevA.108.033517