Showing papers by "Khaled Karrai published in 2010"

Positioning device with confocal Fabry-Perot interferometer

Abstract: Position acquisition device has position acquisition unit with a confocal Fabry-Perot interferometer (10). The confocal Fabry-Perot interferometer has first and second resonator reflective surfaces; and folding reflective surface arranged in a beam path between first and second resonator reflective surfaces. Folding reflective surface is coupled to an object. Collimator is arranged in the beam path between first and second resonator reflective surfaces. An independent claim is included for a method for acquiring position.

Cavity nano-optomechanics: a nanomechanical system in a high finesse optical cavity

Abstract: The coupling of mechanical oscillators with light has seen a recent surge of interest, as recent reviews report. 1,2 This coupling is enhanced when confining light in an optical cavity where the mechanical oscillator is integrated as backmirror or movable wall. At the nano-scale, the optomechanical coupling increases further thanks to a smaller optomechanical interaction volume and reduced mass of the mechanical oscillator. In view of realizing such cavity nanooptomechanics experiments, a scheme was proposed where a sub-wavelength sized nanomechanical oscillator is coupled to a high finesse optical microcavity. 3 Here we present such an experiment involving a single nanomechanical rod precisely positioned into the confined mode of a miniature Fabry-Perot cavity. 4 We describe the employed stabilized cavity set-up and related finesse measurements. We proceed characterizing the nanorod vibration properties using ultrasonic piezo-actuation methods. Using the optical cavity as a transducer of nanomechanical motion, we monitor optically the piezo-driven nanorod vibration. On top of extending cavity quantum electrodynamics concepts to nanomechanical systems, cavity nano-optomechanics should advance into precision displacement measurements near the standard quantum limit 5 , investigation of mechanical systems in their quantum regime, non-linear dynamics 6 and sensing applications.

Cavity nano-optomechanics: a nanomechanical system in a high finesse optical cavity

Abstract: The coupling of mechanical oscillators with light has seen a recent surge of interest, as recent reviews report.1, 2 This coupling is enhanced when confining light in an optical cavity where the mechanical oscillator is integrated as back-mirror or movable wall. At the nano-scale, the optomechanical coupling increases further thanks to a smaller optomechanical interaction volume and reduced mass of the mechanical oscillator. In view of realizing such cavity nano-optomechanics experiments, a scheme was proposed where a sub-wavelength sized nanomechanical oscillator is coupled to a high finesse optical microcavity.3 Here we present such an experiment involving a single nanomechanical rod precisely positioned into the confined mode of a miniature Fabry-Perot cavity.4 We describe the employed stabilized cavity set-up and related finesse measurements. We proceed characterizing the nanorod vibration properties using ultrasonic piezo-actuation methods. Using the optical cavity as a transducer of nanomechanical motion, we monitor optically the piezo-driven nanorod vibration. On top of extending cavity quantum electrodynamics concepts to nanomechanical systems, cavity nano-optomechanics should advance into precision displacement measurements near the standard quantum limit5, investigation of mechanical systems in their quantum regime, non-linear dynamics6 and sensing applications.