Guided acoustic wave resonators using an acoustic Bragg mirror

Kone, I.; Domingue, Frédéric; Reinhardt, Alexandre; Jacquinot, H.; Borel, Mélodie; Gorisse, M.; Parat, G.; Casset, F.; Pellissier-Tanon, D.; Carpentier, Jean‐François; Buchaillot, L.; Dubus, Bertrand

doi:10.1063/1.3440370

Cited by 12 publications

(7 citation statements)

References 9 publications

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“…Finding 1he DBR transmittivity for 1he sound wave is done in a sinrilar manner [3,4]. Assume a sound wave wi1h frequency f and waveleng1h .A is incident on a DBR.…”

Section: Si B3 the Acoustic Transmission Through A Dbrmentioning

confidence: 99%

“…1 Optomechanical systems have been used to observe quantum effects which are remarkable in that they are associated with the motion of massive objects. 2,3,4,5,6,7,8,9,10,11,12 They have also been proposed for use in a range of quantum information and sensing applications. 13,14,15,16,17,18,19,20,21,22 Realizing these goals typically requires strong optomechanical coupling, weak EM and mechanical loss, efficient cooling to cryogenic temperatures, and reduced influence from technical noise.To date, nearly all optomechanical devices have used solid objects as mechanical oscillators.However, liquid oscillators offer potential advantages.…”

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confidence: 99%

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Superfluid Brillouin optomechanics

et al. 2016

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Optomechanical systems couple an electromagnetic cavity to a mechanical resonator which is typically formed from a solid object. The range of phenomena accessible to these systems depends on the properties of the mechanical resonator and on the manner in which it couples to the cavity fields. In both respects, a mechanical resonator formed from superfluid liquid helium offers several appealing features: low electromagnetic absorption, high thermal conductivity, vanishing viscosity, well-understood mechanical loss, and in situ alignment with cryogenic cavities. In addition, it offers degrees of freedom that differ qualitatively from those of a solid. Here, we describe an optomechanical system consisting of a miniature optical cavity filled with superfluid helium. The cavity mirrors define optical and mechanical modes with near-perfect overlap, resulting in an optomechanical coupling rate ~ 3 kHz. This coupling is used to drive the superfluid; it is also used to observe the superfluid's thermal motion, resolving a mean phonon number as low as 11.Light confined in a cavity exerts forces on the components that form the cavity. These forces can excite mechanical vibrations in the cavity components, and these vibrations can alter the propagation of light in the cavity. This interplay between electromagnetic (EM) and mechanical degrees of freedom is the basis of cavity optomechanics. It gives rise to a variety of nonlinear phenomena in both the EM and mechanical domains, and provides means for controlling and sensing EM fields and mechanical oscillators. 1 If the optomechanical interaction is approximately unitary, it can provide access to quantum effects in the optical and mechanical degrees of freedom. 1 Optomechanical systems have been used to observe quantum effects which are remarkable in that they are associated with the motion of massive objects. 2,3,4,5,6,7,8,9,10,11,12 They have also been proposed for use in a range of quantum information and sensing applications. 13,14,15,16,17,18,19,20,21,22 Realizing these goals typically requires strong optomechanical coupling, weak EM and mechanical loss, efficient cooling to cryogenic temperatures, and reduced influence from technical noise.To date, nearly all optomechanical devices have used solid objects as mechanical oscillators.However, liquid oscillators offer potential advantages. A liquid can conformally fill a hollow EM cavity, 23 allowing for near-perfect overlap between the cavity's EM modes and the normal modes of the liquid body's vibrations. In addition, the liquid's composition can be changed in situ, an important feature for applications in fluidic sensing. 24 However, most liquids face two important obstacles to operation in or near the quantum regime: their viscosity results in strong mechanical losses, and they solidify when cooled to cryogenic temperatures. Liquid helium is exceptional in both respects, as it does not solidify under its own vapor pressure and possesses zero viscosity in its purely superfluid state. In addition, liquid He has low EM lo...

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“…Finding 1he DBR transmittivity for 1he sound wave is done in a sinrilar manner [3,4]. Assume a sound wave wi1h frequency f and waveleng1h .A is incident on a DBR.…”

Section: Si B3 the Acoustic Transmission Through A Dbrmentioning

confidence: 99%

mentioning

confidence: 99%

Superfluid Brillouin optomechanics

et al. 2016

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“…Figure 1 b shows only 5 rings to prevent overloading the drawing. In reality, more rings may be required to provide optimal conditions for acoustic wave Bragg reflection [ 48 ]. By dividing the rings into n s equal-equidistant sectors one gets the structures in Figure 1 c,d, where n s is equal to 3 and 4, respectively.…”

Section: Methodsmentioning

confidence: 99%

Periodic Tubular Structures and Phononic Crystals towards High-Q Liquid Ultrasonic Inline Sensors for Pipes

Mukhin

Lücklum

2021

Sensors

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The article focuses on a high-resolution ultrasound sensor for real-time monitoring of liquid analytes in cylindrical pipes, tubes, or capillaries. The development of such a sensor faces the challenges of acoustic energy losses, including dissipation at liquid/solid interface and acoustic wave radiation along the pipe. Furthermore, we consider acoustic resonant mode coupling and mode conversion. We show how the concept of phononic crystals can be applied to solve these problems and achieve the maximum theoretically possible Q-factor for resonant ultrasonic sensors. We propose an approach for excitation and measurement of an isolated radial resonant mode with minimal internal losses. The acoustic energy is effectively localized in a narrow probing area due to the introduction of periodically arranged sectioned rings around the tube. We present a sensor design concept, which optimizes the coupling between the tubular resonator and external piezoelectric transducers. We introduce a 2D-phononic crystal in the probing region for this purpose. The Q-factor of the proposed structures show the high prospects for phononic crystal pipe sensors.

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“…20,21) Acoustic reflectors consist of two materials with high and low acoustic impedance, where dielectric thin films are mainly used as the low-impedance materials. 22,23) By depositing a ∼10 nm metallic film, picosecond ultrasonics can excite ultrasound in dielectric material through the thermal expansion of the metal. 24) For "thick" nm films (>400 nm), we have measured the longitudinal elastic constants and sound velocities of SiO 2 , 25,26) SiON, 27) and AlN 28) films by observing Brillouin oscillation.…”

Section: Introductionmentioning

confidence: 99%

Elastic constant of dielectric nano-thin films using three-layer resonance studied by picosecond ultrasonics

Fukuda

Nagakubo

Ogi

2021

Jpn. J. Appl. Phys.

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Elastic constants and sound velocities of nm order thin films are essential for designing acoustic filters. However, it is difficult to measure them for dielectric thin films. In this study, we use a three-layer structure where a dielectric nano-thin film is sandwiched between thicker metallic films to measure the longitudinal elastic constant of the dielectric film. We propose an efficiency function to estimate the optimal thicknesses of the components. We use Pt/NiO/Pt three-layer films for confirming our proposed method. The determined elastic constant of NiO deposited at room temperature is smaller than the bulk value by ∼40%. However, it approaches the bulk value as the deposition temperature increases. We also reveal that the uncertainty of the elastic constant of the Pt film insignificantly affects the accuracy of the determined elastic constant of NiO in this structure.

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Guided acoustic wave resonators using an acoustic Bragg mirror

Cited by 12 publications

References 9 publications

Superfluid Brillouin optomechanics

Superfluid Brillouin optomechanics

Periodic Tubular Structures and Phononic Crystals towards High-Q Liquid Ultrasonic Inline Sensors for Pipes

Elastic constant of dielectric nano-thin films using three-layer resonance studied by picosecond ultrasonics

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