Observation of Brillouin optomechanical strong coupling with an 11 GHz mechanical mode
Observation of Brillouin optomechanical strong coupling with an 11 GHz mechanical mode
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DOI：
10.1364/optica.6.000007
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发表时间：
2019-01-20
期刊：
影响因子：
10.4
通讯作者：
Vanner, M. R.
中科院分区：
文献类型：
--
作者：
Enzian, G.;Szczykulska, M.;Vanner, M. R.
实现与高频声子的腔光机械强耦合为量子技术的发展提供了丰富的途径，包括量子态转移，存储和转导，以及实现宏观声子自由度的几项基础研究。然而，实现这种与GHz机械模式的耦合已被证明是具有挑战性的，其中一个突出的障碍是许多材料中的材料和表面诱导的光吸收。在这里，我们规避这些挑战，并报告观察到的光机械强耦合的高频（11 GHz）的机械模式的熔融石英回音壁微谐振器通过电致伸缩布里渊相互作用。使用光外差检测方案，反斯托克斯光从谐振腔背散射测量，和正常模式分裂和避免交叉观察记录的光谱，提供明确的签名强耦合。通过使用辅助泵浦谐振，光机械耦合速率达到高达G/2 π =39 MHz的值，其中耦合支配光学（κ/2 π = 3 MHz）和机械（γ（m）/2 π = 21 MHz）幅度衰减速率。我们的发现为利用光和声进行光量子控制提供了一种很有前途的新方法。
Achieving cavity-optomechanical strong coupling with high-frequency phonons provides a rich avenue for quantum technology development, including quantum state transfer, memory, and transduction, as well as enabling several fundamental studies of macroscopic phononic degrees of freedom. Reaching such coupling with GHz mechanical modes, however, has proved challenging, with a prominent hindrance being material- and surface-induced optical absorption in many materials. Here, we circumvent these challenges and report the observation of optomechanical strong coupling to a high-frequency (11 GHz) mechanical mode of a fused-silica whispering-gallery microresonator via the electrostrictive Brillouin interaction. Using an optical heterodyne detection scheme, the anti-Stokes light back-scattered from the resonator is measured, and normal-mode splitting and an avoided crossing are observed in the recorded spectra, providing unambiguous signatures of strong coupling. The optomechanical coupling rate reaches values as high as G/2 pi=39 MHz through the use of an auxiliary pump resonance, where the coupling dominates both optical (kappa/2 pi = 3 MHz) and mechanical (gamma(m)/2 pi = 21 MHz) amplitude decay rates. Our findings provide a promising new approach for optical quantum control using light and sound.