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Heat dissipation has become one of the biggest challenges to improving the performance, reliability and power density of electronic devices. One of the crucial components in electronics packaging that must be further developed to address this challenge is thermal interface materials (TIMs). Recently, packed SiO2 nanoparticles, which could serve as TIMs when embedded in a polymer matrix, have been...
We study the nonlinear ultrafast carrier dynamics in highly n-doped In0.53Ga0.47As using terahertz (THz) time-domain spectroscopy (THz-TDS). In addition to the bleaching effect, we further observe significant THz waveform modulations and high frequency generations.
We investigate the accuracy of the nonrigorous symmetric second-order absorbing boundary condition (ABC) implemented in the higher order large domain finite element method (FEM) technique for electromagnetic analysis in the frequency domain. The electric field is expanded using edge based curl-conforming polynomial basis functions and geometrical modeling is done by curved hexahedral finite elements...
A finite size thin metamaterial absorber is used to measure the field distributions incident on its surface. Absorption is realized by lumped resistors interconnecting the surface patches arranged on a grounded substrate at the resonance frequency of the absorber structure. The 2-d distributions of the absorbed power and electric field distributions are obtained by measuring the voltages induced on...
Herein we analyze the propagation of a ultrawideband trapezoidal pulse through human tissues. This analysis indicates that the frequency dispersive propagation implies larger power levels in the propagated electric field which lead to review the definition of the exposure limit for ultrawideband signals.
We present, for general relativistic case, a theoretical study of nonresonant annihilation of e--e+ pair in mu--mu+ pair. We analyze condition of appearance of resonance. Itpsilas derived the expressions for the nonresonant amplitude and cross-section of studied process. It is shown that in the case of the ultrarelativistic energies the partial differential cross-section is factorized as a product...
Optical Coherence Tomography (OCT) is a well known technique for creating non-invasive, high resolution images of biological microstructure. OCT has matured into animportant imaging modality since its invention in 1991. The popularity of the method lies in the numerous advantages that it offers high detection sensitivity allowing fast imaging speed, andhigh spatial resolution. In this paper we propose...
An innovative investigation of optical feedback or self-mixing interference within the cavity of a single-longitudinal-mode laser is described as an integral part of a novel interrogation scheme to be employed in a fiber Bragg grating-based sensor for strain measurement. The entire sensor device simply consists of a laser diode with an integrated photodiode which is coupled to a fiber Bragg grating...
Nonlinear propagation experiments with intense THz pulses on n-type GaAs show even at room temperature coherent polarizations with lifetimes of more than 1 ps contrary to the predictions of Drude theory.
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