Hajime Okamoto

Feb 7, 2024 | link.aps.org | Motoki Asano |Hiroshi Yamaguchi |Hajime Okamoto

We demonstrate a fiber-type optomechanical array consisting of elastically interconnected silica microbottle resonators with high-Q optical and mechanical modes. In total, 50 optomechanical resonators fabricated by fine glass processing are uniformly arrayed on a silica fiber. Evanescent coupling of a tapered optical fiber to an arbitrary resonator allows for highly sensitive readout and efficient actuation of mechanical motion at an arbitrary position in the array.

May 22, 2023 | link.aps.org | Motoki Asano |Hajime Okamoto |Hiroshi Yamaguchi |Daiki Hatanaka

Abstract Phononic crystal (PnC) enables strong confinement of phonons in a wavelength-scale tiny area due to a band gap, which can enhance the interaction with different physical systems. Here, we utilize the PnC to demonstrate local manipulations of magnons by using ultrahigh frequency phonons confined in a phononic cavity, where the tiny and low-loss vibrations excite magnons in a micromagnet via magnetostriction.