Abstract
We aim to study the properties of the output probe field (OPF) in a system composed of two coupled-optical cavities. A strong pump and a weak probe field drives the left cavity whereas the right-side cavity is coupled to mechanical oscillation via photothermal effect. The two cavities are coupled with optical coupling strength J. Single photothermally induced transparency (PTIT) in a single cavity is realized via thermal effect (2020, Sci. Adv. 6, eaax8256). Following the idea, we report double PTIT in coupled-cavities system. The control of single to double PTIT is realized in the proposed system by properly adjusting the coupling strength J. We further show the enhancement of slow light by adjusting the coupling strength (J) between the cavities. Our proposed scheme facilitates experiments to investigate photothermal effects in an array of optomechanical systems.
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