scholarly journals A numerical fitting routine for frequency-domain thermoreflectance measurements of nanoscale material systems having arbitrary geometries

2021 ◽  
Vol 129 (3) ◽  
pp. 035103
Author(s):  
Ronald J. Warzoha ◽  
Adam A. Wilson ◽  
Brian F. Donovan ◽  
Andrew N. Smith ◽  
Nicholas Vu ◽  
...  
Keyword(s):  
Frequency Domain ◽  
Nanoscale Material ◽  
Numerical Fitting ◽  
Material Systems ◽  
Arbitrary Geometries

Wave Beaming in Nanostructured Materials With Engineered Defects

2008 ◽  
Author(s):  
Mahmoud I. Hussein ◽  
Michael J. Leamy ◽  
Massimo Ruzzene
Keyword(s):  
Periodic Structures ◽  
Graphene Nanosheets ◽  
Low Frequency ◽  
Two Dimensional ◽  
Propagation Characteristics ◽  
Nanoscale Material ◽  
Material Systems ◽  
Acoustic Focusing ◽  
Acoustic Waveguides ◽  
Draft Paper

Recent advances in the fabrication of nanoscale material systems have made it possible to alter precisely the atomic structure in ways that enhance the properties and allow for certain functions to be realized. This work is concerned with two-dimensional periodic structures and emphasizes the effects of intentional defects on their wave propagation characteristics. In this draft paper, investigations are limited to a two-dimensional spring-mass lattice, composed of “super-cells” where mass inclusions are added to alter band-gap properties, as well as low frequency directionality. The presented results will then be extended to two-dimensional nanostructures, such as graphene nanosheets, in order to investigate their application as nanoscale acoustic waveguides, where engineered defects, uniformally distributed across the entire sheet, are introduced by design with the objective of rendering the medium anisotropic. Such anisoptropy leads to acoustic directionality, which can be exploited for waveguiding or acoustic-focusing purposes.

scholarly journals Phase stability in nanoscale material systems: extension from bulk phase diagrams

Nanoscale ◽  
2015 ◽  
Vol 7 (21) ◽  
pp. 9868-9877 ◽  
Author(s):  
Saurabh Bajaj ◽  
Michael G. Haverty ◽  
Raymundo Arróyave ◽  
William A. Goddard III FRSC ◽  
Sadasivan Shankar
Keyword(s):  
Phase Diagrams ◽  
Phase Stability ◽  
Bulk Phase ◽  
Nanoscale Material ◽  
Material Systems

scholarly journals Correction: Phase stability in nanoscale material systems: extension from bulk phase diagrams

Nanoscale ◽  
2015 ◽  
Vol 7 (48) ◽  
pp. 20776-20776
Author(s):  
Saurabh Bajaj ◽  
Michael G. Haverty ◽  
Raymundo Arróyave ◽  
William A. Goddard ◽  
Sadasivan Shankar
Keyword(s):  
Phase Diagrams ◽  
Phase Stability ◽  
Bulk Phase ◽  
Nanoscale Material ◽  
Material Systems ◽  
Correction Phase

Confined Transducer Geometries to Enhance Sensitivity to Thermal Boundary Conductance in Frequency-Domain Thermoreflectance Measurements

2021 ◽  
Author(s):  
Ronald J. Warzoha ◽  
Adam A. Wilson ◽  
Brian F. Donovan ◽  
Andy Clark ◽  
Xuemei Cheng ◽  
...  
Keyword(s):  
Thermal Resistance ◽  
Frequency Domain ◽  
Optical Pump ◽  
Pump Probe ◽  
Thermal Boundary Conductance ◽  
Buried Interfaces ◽  
Thermal Penetration Depth ◽  
Numerical Fitting ◽  
Measurement Resolution ◽  
Heating Event

Abstract Quantifying the resistance to heat flow across well-bonded, planar interfaces is critical in modern electronics packaging architectures, particularly as device length scales are reduced and power demands continue to grow unabated. However, very few experimental techniques are capable of measuring the thermal resistance across such interfaces due to limitations in the required measurement resolution provided by the characterization technique (i.e., Rth < 0.1 mm2·K/W in steady-state configurations) and restrictions on the thermal penetration depth that can be achieved as a result of the heating event that is typically imposed on a sample’s surface (for optical pump-probe thermoreflectance techniques). A recent numerical fitting routine for Frequency-domain Thermoreflectance (FDTR) developed by the authors1 offers a potential avenue to rectify these issues if the transducer’s geometry can be confined. This work utilizes numerical simulations to evaluate the sensitivity of FDTR to a range of thermal boundary resistance (TBR) values as a function of the thermal resistance of adjacent material layers. Experimental measurements are performed across a handful of different material systems to validate our computational results and to demonstrate the the extent to which confined transducer geometries can improve our sensitivyt to the TBR across so-called “buried” interfaces when characterized with FDTR.

Correction to "The analysis of slug tests in the frequency domain" (WRR 25(11), pp. 2388-2396

1990 ◽  
Vol 26 (8) ◽  
pp. 1863-1863
Author(s):  
Paul Marschall ◽  
Baldur Barczewski
Keyword(s):  
Frequency Domain ◽  
Slug Tests
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