Abstract
Electromagnetically induced transparency has great theoretical and experimental importance in many areas of physics, such as atomic physics, quantum optics and, more recent, cavity optomechanics. Optical delay is the most prominent feature of electromagnetically induced transparency, and in cavity optomechanics, the optical delay is limited by the mechanical dissipation rate of sideband-resolved mechanical modes. Here we demonstrate a cascaded optical transparency scheme by leveraging the parametric phonon-phonon coupling in a multimode optomechanical system, where a low damping mechanical mode in the unresolved-sideband regime is made to couple to an intermediate, high-frequency mechanical mode in the resolved-sideband regime of an optical cavity. Extended optical delay and higher transmission as well as optical advancing are demonstrated. These results provide a route to realize ultra-long optical delay, indicating a significant step towards integrated classical and quantum information storage devices.
Highlights
Induced transparency has great theoretical and experimental importance in many areas of physics, such as atomic physics, quantum optics and, more recent, cavity optomechanics
B, we start with a regular optomechanical system in the resolved-sideband regime, where an optical cavity is coupled to a high-frequency mechanical mode with coupling rate gom. We introduce another sideband-unresolved low-frequency mechanical mode, which couples to the high-frequency mechanical mode through parametric phonon–phonon coupling with coupling rate gmm
The interaction Hamiltonian of the parametric phonon– phonon coupling has a similar form as radiation pressure coupling in optomechanical systems (Supplementary Note 1)
Summary
Induced transparency has great theoretical and experimental importance in many areas of physics, such as atomic physics, quantum optics and, more recent, cavity optomechanics. The photon is the ideal choice for long-distance communication owing to its low propagation loss, high speed and large bandwidth In both quantum and classical domains, optical delay is a favoured feature for advanced optical networks, as it offers the ability to buffer and store optical signals[1]. By combining the optomechanical coupling and parametric phonon–phonon coupling, a secondary narrow transparency window produced by the low-frequency breathing mechanical mode is observed on the top of the original wide transparency window produced by the high-frequency pinch mechanical mode In this cascaded EIT scheme, the optical delay is improved by eight times with simultaneous increase in optical transmission compared with normal EIT configuration
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