Figure 8.

Optomechanical strong-coupling systems. (a) Optomechanical cavity with optical and mechanical strong coupling, where sub-bands in the output signal show the frequency of the mechanical mode. The green arrow indicates that upon pumping the sidebands at the red-detuned frequency, a phonon mode of the mechanical part is added to the photons, leading to a re-emission near the central frequency (natural frequency of the cavity mode, blue arrow). Reproduced with permission from ref (154). Copyright 2014 American Institute of Physics. (b) Energetic picture showing the addition and extraction of a phonon from the mechanical mode upon laser excitation at the red-detuned sideband frequency (ω_L). Reproduced with permission from ref (163). Copyright 2008 Nature Publishing Group. (c) Illustration of a double-photonic crystal slab cavity (DPhC) with a mode of frequency ω_a and molecular [W(CO)₆] transition frequency ω_c, coupled to the PhC slab vibrational mode of frequency, ω_m, and the W(CO)₆-cavity coupling strength Ω_R. Reproduced with permission from ref (156). Copyright 2022 American Institute of Physics. (d) Proposed scheme of joint optomechanical-optical cavity with molecular strong coupling to enable both optical-optomechanical molecule/atom-optomechanical couplings. Cavity 1 is an optical cavity, and cavity 2 is an optomechanical cavity. J is the coupling strength between the two cavities, a₁ and a₂ correspond to the creation of cavities 1 and 2, and ε_l is the external field applied to cavity 2, e.g., a pump laser. Reproduced with permission from ref (161). Copyright 2018 Nature Publishing Group.