Topological optomechanical amplifier with synthetic $\mathcal{P}\mathcal{T}$-symmetry

Abstract

We propose how to achieve synthetic $\mathcal{P}\mathcal{T}$ symmetry in optomechanics without using any active medium. We find that harnessing the Stokes process in such a system can lead to the emergence of exceptional point (EP), i.e., the coalescing of both the eigenvalues and the eigenvectors of the system. By encircling the EP, both non-reciprocal optical amplification and chiral mode switching can be achieved. As a result, our synthetic $\mathcal{P}\mathcal{T}$-symmetric optomechanics works as a topological optomechanical amplifier. This provides a surprisingly simplified route to realize $\mathcal{P}\mathcal{T}$-symmetric optomechanics, indicating that a wide range of EP devices can be created and utilized for various applications such as topological optical engineering and nanomechanical processing or sensing.

10 pages,4 figures in main text, 15 pages, 6 figures in supplement file. Supplement file can be found in the download source

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Cited by in corpus (4)

• Detection sensitivity enhancement of magnon Kerr nonlinearity in cavity magnonics induced by coherent perfect absorption
• Higher-order exceptional point in a blue-detuned non-Hermitian cavity optomechanical system
• Broadband optical nonreciprocity via nonreciprocal band structure
• Multiterminal Nonreciprocal Routing in an Optomechanical Plaquette via Synthetic Magnetism