We aim to study the properties of the output probe field (OPF) in a system composed of two coupledoptical 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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The high-precision position measurement scheme of a single atom in two-dimensional (2D) and three-dimensional (3D) is investigated in a four-level tripod-type system. The atom interacts with the two orthogonal standing wave fields (OSWFs) and three OSWFs for 2D and 3D atom localization. The high-precision position of the atom is observed by adjusting the suitable system parameters. We achieve a high-precision single localized peak in the 2D plane and a single localized sphere smaller than the cubic optical wavelength in 3D volume space. We also see the impact of the Doppler shift on atom localization in 2D and 3D. We show that the Doppler shift dramatically deteriorates the precision of spatial information. The proposed high-precision atom localization scheme has applications in laser cooling and Bose-Einstein condensation phenomena.