Quality Factor

Schmid, Silvan; Villanueva, Luis Guillermo; Roukes, M. L.

doi:10.1007/978-3-319-28691-4_2

Cited by 6 publications

(7 citation statements)

References 55 publications

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“…Except for an initial rise in Q due to damping dilution, the reference Q did not show any major signal changes during the temperature ramp. The reader is referred to the Supporting Information for a comparison between reference and sample Q of this measurement.…”

Section: Resultsmentioning

confidence: 88%

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Ultrasensitive Microstring Resonators for Solid State Thermomechanical Analysis of Small and Large Molecules

et al. 2018

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Section: Resultsmentioning

confidence: 88%

“…Figure b also introduces the Q measurements. The Q of a resonator is a measure of the rate of energy dissipation and is directly related to the viscoelastic material damping . The damping is frequency dependent and therefore enables a more dynamical measure of the material.…”

Section: Resultsmentioning

confidence: 99%

Ultrasensitive Microstring Resonators for Solid State Thermomechanical Analysis of Small and Large Molecules

et al. 2018

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“…Unlike the mechanical and electro-static actuation, frequency upshift has been observed in the resonator under electro-thermal actuation. The decrease in the quality factor suggests that the energy dissipated in the resonator is larger than the energy stored at resonant frequency [36], which can be explained by the higher damping [16] or more surface loss [37] of the energy as higher AC voltage is applied to the membrane. The boost of thermal gradient in the membrane with increasing AC voltage might enhance the thermoelastic damping, which increases the dissipation [36].…”

Section: Frequency Shift and Quality Factormentioning

confidence: 99%

The closed cavity resonator formed by graphene/PMMA for low frequency ultrasound detection

Wood²,

Mastropaolo

et al. 2022

Preprint

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A graphene/poly (methyl methacrylate) (PMMA) closed cavity resonator for low-frequency ultrasound (less than 200 kHz) detection has been fabricated. The 6-layer graphene with 450 nm PMMA laminated layer has been dry transferred onto the closed cavity with the air gap of 105 μm. The resonator has been actuated in atmosphere and room temperature by mechanical, electro-static and electro-thermal methods. The resonant frequency has been measured to be around 160 kHz. The (1,1) mode has been observed to dominate the resonance, which suggests the graphene/PMMA membrane has been perfectly clamped and seals the closed cavity. The degree of linearity of the membrane’s displacement versus the actuation signal has been determined. The resonant frequency has been observed to be tuned to about 4% by applying AC voltage through the membrane. The strain has been estimated to be around 0.08%. This research puts forward a sensor design for low-frequency ultrasonic detection.

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“…The third term represents the restoring force given by the pre-stressed material. The solution to this differential equation has been extensively described [59,62,63]. Here we present a general description to find the solutions and extract the properties of mechanical systems.…”

Section: D Mechanical Resonators: Stringsmentioning

confidence: 99%

“…Here we present a general description to find the solutions and extract the properties of mechanical systems. A very well known method to find a solution for the differential equation (2.9) is proposing an ansatz solution with separable variables [62].…”

Section: D Mechanical Resonators: Stringsmentioning

confidence: 99%

Phononics: Engineering and control of acoustic fields on a chip

Romero¹

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Micro and nanomechanical systems play an important role in modern science and technology.They are indispensable for precision sensing, navigation and communication. Over the past decade, the rapid advances in nano-fabrication and measurement science have enabled quantum control of mechanical devices by integrating them to optical and microwave cavities, in the growing field of quantum optomechanics. However, experiments in quantum optomechanics at room temperature still face significant challenges. Perhaps the most demanding condition to perform experiments of this nature is reducing noise level due to coupling of the device to its environment through mechanical vibrations, phonons. In this thesis, we engineer micromechanical devices that confine mechanical excitations, decoupling them from their environment. The engineered design of these resonators combines a built-in suspended phononic low pass filter with a trampoline design made of top quality SiC single crystal. Results with quality factors Q ∼ 4 × 10 8 show the efficiency of these resonators. This is the largest Q for a system of its kind with such a large mesoscopic mode size ∼ 0.5 mm 2 and resonance frequency f ∼ 220 kHz.The ultra-high Q mechanical resonators we developed can be used for quantum optomechanics experiments at room temperature.Similar to electrons, phonons propagate through material and are characterized by their dispersion relation. By engineering the properties of the material it is possible to confine and guide phonons through phononic channels. The importance of guided phonons relies on the fact that guided signals are the back-bone of all communication systems. The existing platforms for mechanical channels rely on the inclusion of phononic crystals for phonon confinement. However, phononic crystals base their functionality on acoustic interference, limiting its scalability. In this thesis, we designed, fabricated and characterized the basic components for a phononic circuitry platform based on highly stressed Si 3 N 4 membranes on Si. These phononic waveguides share a similar mathematical framework with to photonic waveguides. Our phononic waveguides are single mode for a range of frequencies. In this region, the guided mode experiences low dissipation. We also show that there is a cut-off frequency at which the excitations cannot propagate, completely analogous to the photonic case. This phononic "wires" could in principle be used as the fundamental element for mechanics based communication networks.In the last chapter of this thesis, we propose a magnetomechanical system, where the mechanical system couples through the momentum to an electromagnetic field. By coupling the momentum to an electromagnetic field, it is possible to perform non-demolition measurement protocols that allow us to measure directly the position of the oscillator. By enhancing the coupling between the mechanics and the electromagnetic field we predict that the ground state of the two systems get entangled. We designed a system that can achieve coupling rates as...

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Quality Factor

Cited by 6 publications

References 55 publications

Ultrasensitive Microstring Resonators for Solid State Thermomechanical Analysis of Small and Large Molecules

Ultrasensitive Microstring Resonators for Solid State Thermomechanical Analysis of Small and Large Molecules

The closed cavity resonator formed by graphene/PMMA for low frequency ultrasound detection

Phononics: Engineering and control of acoustic fields on a chip

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