Global ETD Search
Search theses and dissertations gathered from participating repositories worldwide. Every result links back to the library that holds it. No account is needed.
Results
Showing 1 to 20 of 45 for “"Thermoreflectance"”.
-
Investigation of Anisotropic Heat Transport Through Frequency Domain Thermoreflectance Technique
… anisotropic materials through frequency domain thermoreflectance (FDTR) technique. Firstly, I describe the experimental setup and numerical modeling of the FDTR. Then, I explain the development of beam offset frequency domain thermoreflectance (BO-FDTR) and frequency domain magneto-optical Kerr …
-
Thermoreflectance for Contactless Sintering Characterization: From Metal Nanoparticles to Stretchable Conductors
… Here, we demonstrate that frequency-domain thermoreflectance (FDTR), an optical pump-probe technique, can be used for non-contact, non-destructive process monitoring that is compatible with high-throughput printed electronics manufacturing, unlike traditional electrical resistance …
-
Thermoreflectance Measurements of Non-Diffusive Transport In Bulk And Nanoscale Materials
… To achieve this goal, a frequency domain thermoreflectance (FDTR) setup is established and three different extensions to this setup are presented that improve the metrology in nanoscale materials or non-diffusive transport. Having different variations of the FDTR setup enables us to …
-
Detecting coherent phonon wave effects in superlattices using time-domain thermoreflectance
… of the SLs are measured using a transient thermoreflectance (TTR) technique at temperatures ranging from 30K to 300K. The results are the first-ever experimental evidence for the presence of coherent wave effects in heat transport through SLs.
-
Experiments on the Thermal, Electrical, and Plasmonic Properties of Nanostructured Materials
… thin films, an alternative frequency-domain thermoreflectance method for thin film thermal conductivity measurement, thermal rectification in nanodendritic porous silicon, and plasmonic enhancement in silver nanospheroids as a reverse photolithography technique. Nanostructured thermoelectrics …
-
Testing theories for thermal transport using high pressure
… an ultrafast pump-probe method, time-domain thermoreflectance (TDTR), combined with gem anvil cell techniques. I demonstrated that pressure tuning of physical properties of materials is an elegant approach to test the validity of theories for thermal transport. Pressure dependence of the …
-
FINITE ELEMENT AND IMAGING APPROACHES TO ANALYZE MULTISCALE ELECTROTHERMAL PHENOMENA
… design and optimization of electronic devices. Thermoreflectance (TR) imaging enables transient thermal characterization at submicron to centimeter scales. Typically, finite element methods (FEM) are used to calculate the temperature profile in devices and ICs with complex geometry. By comparing …
-
Nature and Dynamics of Earth and Planetary Cores From High-Pressure Properties of Iron -Rich Alloys
… compressed materials, I employed the time-domain thermoreflectance (TDTR) method combining with the diamond anvil cell technique (Chapter 5). I report high-pressure thermal conductivity data of water and ice phases up to 11 GPa and at 300 K. The thermal conductivity of Ice VII increases by more …
-
Heat transport by phonons in crystalline materials and nanostructures
… presented in this dissertation are time-domain thermoreflectance (TDTR) for measurements of thermal conductivity of nanostructures and thermal conductance of interfaces; and frequency-domain thermoreflectance (FDTR), which I developed as a direct probe of the mean-free-paths of dominant …
-
Thermal conductivity anisotropy in molybdenum disulfide thin films
… were measured using the time-domain thermoreflectance method. MoS2 samples were prepared with different crystallographic orientations relative to the substrate by magnetron sputtering and ion-beam-assisted deposition. The thermal conductivity of MoS2 was measured as low as 0.2 W/m-K, …
-
Experimental and numerical investigation of phonon mean free path distribution
… measure MFPs using ultrafast transient thermoreflectance method. By optically heating lithographically patterned metallic nanodot arrays, we are able to probe heat transfer at length scales down to 100 nm, far below the diffraction limit for visible light. We demonstrate the new …
-
Near junction thermal management of GaN HEMTs via wafer bonding
… thermal conductivity is measured via time domain thermoreflectance. The results of these measurements are analyzed to determine the thermal performance of the structure. In all, this thesis shows that the proposed bonded technology is a promising method for the fabrication of the next generation …
-
A Nanoengineering Approach to Oxide Thermoelectrics For Energy Harvesting Applications
… measured at room temperature using Time Domain Thermoreflectance.
-
Assessing the performance and reliability of GaN based electronics via optical and electrical methods
… across GaN based electronics via transient thermoreflectance imaging (TTI). A combination of experimental and numerical analysis is used to achieve this. The methods are applied to lateral HEMTs, vertical PIN diodes and cross sectional HEMTs. The limitations of the current techniques are …
-
MEMS Technologies for Energy Harvesting and Sensing
… use of a thermo-optic technique, Time Domain Thermoreflectance (TDTR) in the study of Pb(Zr,Ti)O3 (PZT) thin film texturing. Time Domain Thermoreflectance (TDTR) has been proved to be capable of measuring thermal properties of atomic layers and interfaces. Therefore, we utilized TDTR to …
-
High-density thermoelectric power generation and nanoscale thermal metrology
… generator performance. The method of CCD thermoreflectance imaging is pursued in this thesis as a quantitative means for making noncontact temperature measurements on solid-state samples at the micro- and nano-scale. We develop and test a theory of the instrument and the measurement …
-
Experimental investigations of solid-solid thermal interface conductance
… In this thesis, pump and probe transient thermoreflectance methods are used to measure the thermal interface conductance between solid materials. Two experimental studies of thermal interface conductance are presented, each revealing the complexity of phonon interactions at interfaces …
-
Expanding ultrafast photoacoustics for investigation of mechanical properties and thermal transport
… thermal conductivity changes, time-domain thermoreflectance and transient thermal grating techniques were employed with a, carefully timed additional excitation pulse for carrier generation.
-
Light scattering from tantalum diselenide
… to behave similarly to a band gap seen in thermoreflectance data. The optical constants have also been measured. A dip in the real part of the dielectric constant also occurs in the yellow part of the spectrum, and is related to the observed luminescence and resonance effects.
Page 1 of 3