Measurement of optical coupling between adjacent bi-material microcantilevers

Canetta, Carlo; Narayanaswamy, Arvind

doi:10.1063/1.4824430

Cited by 7 publications

(1 citation statement)

References 15 publications

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“…Recent advancement in the experimental instruments and operational protocols has enabled the measurement of heat flow through nano-devices with a resolution of picowatts [297][298][299][300][301][302]. Presently, the calorimeters have been applied to monitor cellular activities [303,304]; and to study radiative heat transfer [305][306][307][308][309][310], thermal conductivity of nanostructures [311][312][313][314][315], and phase transitions of nanomaterials [316].…”

Section: General Principle Of Nanocalorimetric Techniquesmentioning

confidence: 99%

Local temperatures out of equilibrium

2019

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The temperature of a physical system is operationally defined in physics as "that quantity which is measured by a thermometer" weakly coupled to, and at equilibrium with the system. This definition is unique only at global equilibrium in view of the zeroth law of thermodynamics: when the system and the thermometer have reached equilibrium, the "thermometer degrees of freedom" can be traced out and the temperature read by the thermometer can be uniquely assigned to the system. Unfortunately, such a procedure cannot be straightforwardly extended to a system out of equilibrium, where local excitations may be spatially inhomogeneous and the zeroth law of thermodynamics does not hold. With the advent of several experimental techniques that attempt to extract a single parameter characterizing the degree of local excitations of a (mesoscopic or nanoscale) system out of equilibrium, this issue is making a strong comeback to the forefront of research. In this paper, we will review the difficulties to define a unique temperature out of equilibrium, the majority of definitions that have been proposed so far, and discuss both their advantages and limitations. We will then examine a variety of experimental techniques developed for measuring the non-equilibrium local temperatures under various conditions. Finally we will discuss the physical implications of the notion of local temperature, and present the practical applications of such a concept in a variety of nanosystems out of equilibrium. Figure 4: (a) The product of the density of states η(E) times the global distribution function ϕ|ρ|ϕ forms a strongly pronounced peak at the expectation value of the global system energyĒ. (b) The logarithm of the local distribution function a|ρ|a (solid line) and the logarithm of a canonical distribution (dashed line) with the same local temperature for a harmonic chain. (a) and (b) are reprinted with permission from [74].

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Section: General Principle Of Nanocalorimetric Techniquesmentioning

confidence: 99%

Local temperatures out of equilibrium

2019

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Scanning thermal microscopy: A review

Gomès

Assy

Chapuis

2015

Phys. Status Solidi A

225

218

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Fundamental research and continued miniaturization of materials, components and systems have raised the need for the development of thermal-investigation methods enabling ultra-local measurements of surface temperature and thermophysical properties in many areas of science and applicative fields. Scanning thermal microscopy (SThM) is a promising technique for nanometer-scale thermal measurements, imaging, and study of thermal transport phenomena. This review focuses on fundamentals and applications of SThM methods. It inventories the main scanning probe microscopy-based techniques developed for thermal imaging with nanoscale spatial resolution. It describes the approaches currently used to calibrate the SThM probes in thermometry and for thermal conductivity measurement. In many cases, the link between the nominal measured signal and the investigated parameter is not straightforward due to the complexity of the micro/nanoscale interaction between the probe and the sample. Special attention is given to this interaction that conditions the tip-sample interface temperature. Examples of applications of SThM are presented, which include the characterization of operating devices, the measurements of the effective thermal conductivity of nanomaterials and local phase transition temperatures. Finally, future challenges and opportunities for SThM are discussed.

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A Comprehensive Review for Micro/Nanoscale Thermal Mapping Technology Based on Scanning Thermal Microscopy

Zhang²,

Liu³

et al. 2022

J. Therm. Sci.

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Measurement of optical coupling between adjacent bi-material microcantilevers

Cited by 7 publications

References 15 publications

Local temperatures out of equilibrium

Local temperatures out of equilibrium

Scanning thermal microscopy: A review

A Comprehensive Review for Micro/Nanoscale Thermal Mapping Technology Based on Scanning Thermal Microscopy

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