title: High frequency GaAs nano-optomechanical disk resonator.
abstract: Optomechanical coupling between a mechanical oscillator and light trapped in a cavity increases when the coupling takes place in a reduced volume. Here we demonstrate a GaAs semiconductor optomechanical disk system where both optical and mechanical energy can be confined in a subwavelength scale interaction volume. We observe a giant optomechanical coupling rate up to 100 GHz/nm involving picogram mass mechanical modes with a frequency between 100 MHz and 1 GHz. The mechanical modes are singled-out measuring their dispersion as a function of disk geometry. Their Brownian motion is optically resolved with a sensitivity of 10(-17) m/√Hz] at room temperature and pressure, approaching the quantum limit imprecision.
authors.affiliation: Laboratoire Matériaux et Phénomènes Quantiques, Université Paris Diderot, CNRS, UMR 7162, Paris, France.
authors.forename: Lu
authors.initials: L
authors.lastname: Ding
authors.forename: Christophe
authors.initials: C
authors.lastname: Baker
authors.forename: Pascale
authors.initials: P
authors.lastname: Senellart
authors.forename: Aristide
authors.initials: A
authors.lastname: Lemaitre
authors.forename: Sara
authors.initials: S
authors.lastname: Ducci
authors.forename: Giuseppe
authors.initials: G
authors.lastname: Leo
authors.forename: Ivan
authors.initials: I
authors.lastname: Favero