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We explore the vectorial optomechanical interaction between a nanowire and a focused beam of light. The nanowire is sensitive to the topological variations of the focused laser force field which dramatically modify the phenomenology of the dynamical backaction. The non-conservative topology of the optomechanical interaction is responsible for a novel canonical signature of strong coupling between...
We explore the vectorial optomechanical interaction between a nanowire and a focused beam of light. The nanowire is sensitive to the topological variations of the focused laser force field which dramatically modify the phenomenology of the dynamical backaction.
Most of the optomechanical studies [1] have so far been restricted to objects with sizes much larger than the optical wavelength. Sensitive nano-optomechanical coupling has also been evidenced, but with wavelength size objects which were incorporated into advanced optical microcavity designs. We report a new of ultra-sensitive nano-optomechanical system that breaks these barriers, and enables unprecedentedly...
We investigate the nano-optomechanical properties between a nanowire and a focused beam of light. Based on such a system, we report unprecedently sensitive vectorial detection of nanomechanical motion using SiC nanowires and Carbon nanotubes.
The control of low-entropy quantum states of a micro-oscillator could not only allow researchers to probe quantum phenomena—such as entanglement and decoherence—at an unprecedentedly large scale, but also enable their use as interfaces in hybrid quantum systems. Preparing and probing an oscillator in the conceptually simplest low-entropy state, its quantum ground state, has now become a major goal...
In the past decade, impressive efforts have been powered in the field of optomechanics that is the study of the coupling between a light field and a mechanical degree of freedom, with the major aims of detecting the quantum zero-point motion fluctuations of a mechanical object, and studying the fundamental quantum measurement processes. Though having their own specificities, both aims require combining...
Atoms (and molecules) with a well-suited energy level structure can be rendered transparent to a light beam they would usually absorb by the presence of a “control” laser beam. This “electromagnetically induced transparency” (EIT) [1] can be understood as a consequence of quantum interference of different excitation pathways of the atom by the probing beam. Strong optical dispersion concomitant with...
Cavity optomechanics exploits the coupling of mechanical oscillators to the light field via radiation pressure [1]. Recently, optomechanical coupling in 1D photonic crystal cavities has been observed in patterned single [2] and dual nanobeams (zipper cavities) [3]. Here we study [4] optomechanical coupling in a conventional photonic crystal defect cavity (L3). On the fundamental side, this device...
We experimentally investigate the optomechanical properties of a conventional two-dimensional suspended photonic crystal defect cavity. Particularly, we measure localized mechanical modes in the GHz regime exhibiting high values of the optomechanical vacuum coupling rate exceeding 250 kHz.
We report an optomechanical near-field coupling detection scheme which enabled the first optical measurement of nanomechanical motion with an imprecision 3 dB below that at the standard quantum limit at room temperature.
Using optical sideband cooling, a micromechanical oscillator is cooled to a phonon occupancy below 10 phonons, corresponding to a probability of finding it in its quantum ground state more than 10% of the time.
In analogy to electromagnetically induced transparency observed in atomic systems, we demonstrate that the transmission of a probe laser beam through an optomechanical device can be modulated all-optically using a second, “control” laser beam.
We use evanescent near-fields of high-Q optical microresonators to extend cavity-optomechanical coupling to nanomechanical oscillators. Pure radiation pressure coupling to SiN nanomechanical strings is demonstrated. Dynamical backaction allows creating laser-like nanomechanical oscillation at nanowatt threshold.
We present the dynamic optical response of silica microcavities in a 4He environment. Dispersive properties of silica and external detection of a superfluid sound are characterized, due to accurate temperature tuning of the cryodevice.
Ultra-high Q optical microresonators allow measuring nanomechanical motion with unprecedented sensitivity. For the first time, we reach a measurement imprecision at the standard quantum limit which has been a long sought-after goal for nanomechanical oscillators.
We present the optical and mechanical properties of toroidal optomechanical resonators thermalized to Helium-3 (600 mK) temperatures. Dramatic improvements of mechanical quality factors are reported and evidence for direct phonon absorption is presented.
Using resolved-sideband laser cooling, a micromechanical oscillator is cooled to an average occupation of 63 quanta, and simultaneously measured close to the limit imposed by the Heisenberg uncertainty principle.
Optical gradient fields have been successfully used in various areas, e.g. as optical tweezers. Recently, evanescent fields were employed to sense nanomechanical motion. Enhancing the optomechanical coupling via a cavity offers significantly higher sensitivities. More importantly, cavity retardation effects can render the back-action which any linear position measurement must entail dynamical. We...
Exploring quantum effects in mesoscopic mechanical oscillators as palpable as a pendulum or a cantilever has been a subject of long-standing interest in Quantum Physics and in the context of gravitational wave detection, and has recently - within the setting of cavity optomechanics - received significant interest. Studying non-classical aspects however requires the ability to both prepare and probe...
This work shows independent control over both optical and mechanical degrees of freedom in the microscale optomechanical resonator. Studying the dissipation of different mechanical modes of silica microtoroids it was possible to directly observe mechanical normal mode splitting between different modes of a micromechanical system. The fundamental radial breathing mode (RBM) can couple to flexural modes...
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