title: Cavity-less on-chip optomechanics using excitonic transitions in semiconductor heterostructures.
abstract: The hybridization of semiconductor optoelectronic devices and nanomechanical resonators provides a new class of optomechanical systems in which mechanical motion can be coupled to light without any optical cavities. Such cavity-less optomechanical systems interconnect photons, phonons and electrons (holes) in a highly integrable platform, opening up the development of functional integrated nanomechanical devices. Here we report on a semiconductor modulation-doped heterostructure-cantilever hybrid system, which realizes efficient cavity-less optomechanical transduction through excitons. The opto-piezoelectric backaction from the bound electron-hole pairs enables us to probe excitonic transition simply with a sub-nanowatt power of light, realizing high-sensitivity optomechanical spectroscopy. Detuning the photon energy from the exciton resonance results in self-feedback cooling and amplification of the thermomechanical motion. This cavity-less on-chip coupling enables highly tunable and addressable control of nanomechanical resonators, allowing high-speed programmable manipulation of nanomechanical devices and sensor arrays.
authors.affiliation: NTT Basic Research Laboratories, Nippon Telegraph and Telephone Corporation, Atsugi 243-0198, Japan.
authors.forename: Hajime
authors.initials: H
authors.lastname: Okamoto
authors.affiliation: NTT Basic Research Laboratories, Nippon Telegraph and Telephone Corporation, Atsugi 243-0198, Japan.|Department of Physics, Tohoku University, Sendai, Miyagi 980-8578, Japan.
authors.forename: Takayuki
authors.initials: T
authors.lastname: Watanabe
authors.affiliation: NTT Basic Research Laboratories, Nippon Telegraph and Telephone Corporation, Atsugi 243-0198, Japan.
authors.forename: Ryuichi
authors.initials: R
authors.lastname: Ohta
authors.affiliation: NTT Basic Research Laboratories, Nippon Telegraph and Telephone Corporation, Atsugi 243-0198, Japan.
authors.forename: Koji
authors.initials: K
authors.lastname: Onomitsu
authors.affiliation: NTT Basic Research Laboratories, Nippon Telegraph and Telephone Corporation, Atsugi 243-0198, Japan.
authors.forename: Hideki
authors.initials: H
authors.lastname: Gotoh
authors.affiliation: NTT Basic Research Laboratories, Nippon Telegraph and Telephone Corporation, Atsugi 243-0198, Japan.
authors.forename: Tetsuomi
authors.initials: T
authors.lastname: Sogawa
authors.affiliation: NTT Basic Research Laboratories, Nippon Telegraph and Telephone Corporation, Atsugi 243-0198, Japan.|Department of Physics, Tohoku University, Sendai, Miyagi 980-8578, Japan.
authors.forename: Hiroshi
authors.initials: H
authors.lastname: Yamaguchi