Measurements of the Degree of Comprehensive Cooling in Stochastically Quenched Microstructures

Hammig, Mark D.; Wehe, D.K.

doi:10.1109/jsen.2006.889212

Cited by 3 publications

(2 citation statements)

References 17 publications

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“…The bulk temperature in negligibly affected with single-mode temperature tuning, because most of the degrees of freedom in the system are not modified by feedback. 25,26…”

Section: Journal Of Applied Physicsmentioning

confidence: 99%

Active feedback cooling of a SiN membrane resonator by electrostatic actuation

Borrielli

Bonaldi

Serra

et al. 2021

Journal of Applied Physics

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Feedback-based control techniques are useful tools in precision measurements as they allow us to actively shape the mechanical response of high quality factor oscillators used in force detection measurements. In this paper, we implement a feedback technique on a high-stress low-loss SiN membrane resonator, exploiting the charges trapped on the dielectric membrane. A properly delayed feedback force (dissipative feedback) enables the narrowing of the thermomechanical displacement variance in a similar manner to the cooling of the normal mechanical mode down to an effective temperature T eff . In the experiment reported here, we started from room temperature and gradually increasing the feedback gain, we were able to cool down the first normal mode of the resonator to a minimum temperature of about 124 mK. This limit is imposed by our experimental setup and, in particular, by the injection of the read-out noise into the feedback. We discuss the implementation details and possible improvements to the technique.

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“…The bulk temperature in negligibly affected with single-mode temperature tuning, because most of the degrees of freedom in the system are not modified by feedback. 25,26…”

Section: Journal Of Applied Physicsmentioning

confidence: 99%

Active feedback cooling of a SiN membrane resonator by electrostatic actuation

Borrielli

Bonaldi

Serra

et al. 2021

Journal of Applied Physics

View full text Add to dashboard Cite

show abstract

“…Nevertheless, we stress that the mode temperature T e f f isn't a comprehensive property of the system, rather it depicts a single mode of resonance that is pumped out the thermal equilibrium. The bulk temperature in negligibly affected with single mode temperature tuning, because most of the degrees of freedom in the system are not modified by feedback 25,26 .…”

Section: Dissipative Feedback Theorymentioning

confidence: 99%

Active feedback cooling of a SiN membrane resonator by electrostatic actuation

Borrielli,

Bonaldi,

Serra

et al. 2021

Preprint

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Feedback-based control techniques are useful tools in precision measurements as they allow to actively shape the mechanical response of high quality factor oscillators used in force detection measurements. In this paper we implement a feedback technique on a high-stress low-loss SiN membrane resonator, exploiting the charges trapped on the dielectric membrane. A properly delayed feedback force (dissipative feedback) enables the narrowing of the thermomechanical displacement variance in a similar manner to the cooling of the normal mechanical mode down to an effective temperature T e f f . In the experiment here reported we started from room temperature and gradually increasing the feedback gain we were able to cool down the first normal mode of the resonator to a minimum temperature of about 124mK. This limit is imposed by our experimental set-up and in particular by the the injection of the read-out noise into the feedback. We discuss the implementation details and possible improvements to the technique.

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Effective quality factor tuning mechanisms in micromechanical resonators

Miller

Ansari

Heinz

et al. 2018

Applied Physics Reviews

107

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Quality factor (Q) is an important property of micro- and nano-electromechanical (MEM/NEM) resonators that underlie timing references, frequency sources, atomic force microscopes, gyroscopes, and mass sensors. Various methods have been utilized to tune the effective quality factor of MEM/NEM resonators, including external proportional feedback control, optical pumping, mechanical pumping, thermal-piezoresistive pumping, and parametric pumping. This work reviews these mechanisms and compares the effective Q tuning using a position-proportional and a velocity-proportional force expression. We further clarify the relationship between the mechanical Q, the effective Q, and the thermomechanical noise of a resonator. We finally show that parametric pumping and thermal-piezoresistive pumping enhance the effective Q of a micromechanical resonator by experimentally studying the thermomechanical noise spectrum of a device subjected to both techniques.

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Measurements of the Degree of Comprehensive Cooling in Stochastically Quenched Microstructures

Cited by 3 publications

References 17 publications

Active feedback cooling of a SiN membrane resonator by electrostatic actuation

Active feedback cooling of a SiN membrane resonator by electrostatic actuation

Active feedback cooling of a SiN membrane resonator by electrostatic actuation

Effective quality factor tuning mechanisms in micromechanical resonators

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