A. Haidary, P. Grütter, Y. Miyahara
Physics Department, McGill University, Montreal, QC, Canada
A wide variety of near-field optical phenomena such as apertureless near-field scanning microscopy (ANSM) at optical and terahertz (THz) regimes and surface enhanced Raman scattering relies on the electric field enhancement at the end of a sharp tip. Achieving and controlling this electric field enhancement is a key challenge for a wide range of applications such as surface modification, data ...
F. Bosia, P. Olivero, and E. Vittone
Dipartimento di Fisica Teorica, Università di Torino, Torino, Italy
Dipartimento di Fisica Sperimentale, Università di Torino, Torino, Italy
Ion implantation in insulating materials leads to local variations in mechanical and optical properties that can be exploited for the fabrication of micro-structures. In particular, ion irradiation of diamond causes the formation of buried amorphised layers, with correspondent mass density and refractive index variations that depend on the level of “damage” of the crystal structure. ...
F. Banfi, D. Nardi, and M. Travagliati
Dipartimento Matematica e Fisica, Università Cattolica, Brescia, Italy
JILA, University of Colorado at Boulder, Boulder, Colorado, United States
Center for Nanotechnology Innovation @NEST, Istituto Italiano di Tecnologia, Pisa, Italy
Ultrafast optical generation of pseudosurface acoustic waves is investigated in hypersonic surface phononic crystals. The thermomechanics is modeled from first-principles to follow the initial impulsive heat-driven displacement in the time domain. Spectral decomposition of the displacement over the surface phononic crystal eigenmodes outlines asymmetric resonances featuring the coupling between ...
X. Liang, K. Kang-Hsin Wang, and T. Zhu
University of Pennsylvania
Determination of tissue optical properties distributions is very important for determining light fluence distribution during photodynamic therapy (PDT). In this study, an interstitial diffuse optical tomography (iDOT) system was used to characterize the spatial distribution of optical properties for a series of mathematical phantoms as well as verification measurements in a prostate ...
Non-Equilibrium Quantum Well Populations and Optical Characteristics of III-Nitride Lasers and Light-Emitting Diodes
M. Kisin, and H. El-Ghoroury
Ostendo Technologies, Inc.
COMSOL-based Ostendo’s Optoelectronic Device Modeling Software (ODMS) has been updated to include effects of non-equilibrium QW populations in semiconductor light-emitting and laser diodes. III-nitride light emitters with different levels of polarity have been compared as an illustrative example of ODMS performance. Modeling proved that high intra-QW recombination rates in III-nitride light ...
Leroy, Y., Leriche, B., Cordan, A.S.
InESS — ENSPS, UMR 7163, ILLKIRCH, France
We present in this paper a model to study new memory devices with embedded nanocrystals, emerging in microelectronics. The theoretical calculations and their implementation in FEMLAB are detailed, leading to a quite simple and realistic model. One key point for these memories is the electronic tunnel transfer to store the charge into a nanocrystal. This is why we carry out a brief analysis of ...
X. Ni[1,2], Z. Liu[1,2], and A.V. Kildishev[1,2]
School of Electrical and Computer Engineering, Purdue University, West Lafayette, Indiana, USA
Birck Nanotechnology Center, Purdue University, West Lafayette, Indiana, USA
The emergence of electromagnetic metamaterials has given rise to a variety of fascinating applications, including the perfect lens and the optical cloaking device. For a long time the study of the properties of metamaterials was limited to normal incidence only. However, it is extremely important to know the behavior of metamaterials especially in the area of imaging. In this paper, we use COMSOL ...
S. Sarodia[1,2], W. Zhang, E. Brown
Centerville High School, Dayton, OH, USA
Wright State University, Dayton, OH, USA
Ultrafast terahertz photoconductor devices, especially photomixers, are usually limited in output power by device failure thought to be caused by excessive temperatures. Therefore, understanding of thermal breakdown is essential to the study of device reliability and failure of photoconductors. We performed a series of simulations to determine the electronic and thermal thresholds responsible ...
M. Mattheakis, C. Athanasopoulos, G. P. Tsironis
University of Crete, Heraklion, Greece
We present numerical simulations for the propagation of surface plasmon polaritons in a dielectric-metal-dielectric waveguide using COMSOL Multiphysics® software. We show that the use of an active dielectric with gain that compensates metal absorption losses enhances substantially plasmon propagation. Furthermore, the introduction of the active material induces, for a specific gain value, a ...
M. Csete, G. Szekeres, B. Banhelyi, A. Szenes, T. Csendes, G. Szabo
Department of Optics and Quantum Electronics, University of Szeged, Szeged, Hungary
Department of Computational Optimization, University of Szeged, Szeged, Hungary
Introduction: Predesigned plasmonic structures are capable of enhancing optical phenomena, the key concept is tailoring the integrated devices' composition to engineer the spectral response and near-field distribution . Our previous studies have shown that three-quarter-wavelength periodic plasmonic structures are capable of improving single-photon detection efficiency [2, 3]. Parametric sweep ...