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Friday, March 31, 2017
LPTH Press Release: LightPath Technologies LightPath Technologies Introduces Chalcogenide Glass Productio
Saturday, March 11, 2017
LightPath Technologies to Exhibit At the Upcoming SPIE Defense and Commercial Sensing Event
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Tuesday, March 7, 2017
Seminar: "A few surprises in multiple scattering of light" by Rémi Carminati, 3.23.17/12:00PM-1:00PM/CREOL RM 103
Seminar: "A few surprises in multiple scattering of light" by Rémi Carminati
Thursday, March 23, 2017 12:00 PM to 1:00 PM
CREOL Room 103
CREOL Room 103
Abstract:
Light scattering and transport in disordered media has been extensively studied. On the fundamental side, the possibility to study coherent scattering (speckles) in optics has been an essential tool in mesoscopic physics. On the applied side, methods and techniques have been developed for sensing and imaging in complex media. New trends have emerged recently with the possibility to control light propagation using disordered materials.
In this talk we will review recent results in the theory of light transport (diffusion) and scattering (speckles) that predict unexpected behaviors of interest for the control of light matter--interaction.
We will discuss an invariance property of the average path length in a wave diffusion process [1], and the first measurement demonstrating this invariance [2].
In the study of speckle patterns, we will show that a spatial correlation between the reflected and transmitted intensities persists even in the multiple scattering regime [3]. This makes possible to quantify the level of information on a transmitted speckle that can be deduced from a measurement of the reflected part only. We will finally address the influence of correlations in the disorder on the scattering strength. In the case of hyperuniform materials (a specific class of correlated materials), we will show that disordered materials that are both dense and transparent can be designed [4].
I am indebted to O. Leseur, N. Fayard, A. Goetschy and R. Pierrat with whom most of this work was done.
In this talk we will review recent results in the theory of light transport (diffusion) and scattering (speckles) that predict unexpected behaviors of interest for the control of light matter--interaction.
We will discuss an invariance property of the average path length in a wave diffusion process [1], and the first measurement demonstrating this invariance [2].
In the study of speckle patterns, we will show that a spatial correlation between the reflected and transmitted intensities persists even in the multiple scattering regime [3]. This makes possible to quantify the level of information on a transmitted speckle that can be deduced from a measurement of the reflected part only. We will finally address the influence of correlations in the disorder on the scattering strength. In the case of hyperuniform materials (a specific class of correlated materials), we will show that disordered materials that are both dense and transparent can be designed [4].
I am indebted to O. Leseur, N. Fayard, A. Goetschy and R. Pierrat with whom most of this work was done.
Biography:
Rémi Carminati received is PhD in Optical Physics in 1996 from Ecole Centrale Paris (advisor Prof. J.J. Greffet). In 1996-1997 he was a post-doctoral fellow at the Institute of Material Science of Madrid (Spain) in the group of Prof. M. Nieto-Vesperinas. From 1997 to 2007, he was an associate professor (1997-2003) and a professor (2003-2007) at Ecole Centrale Paris (France). Since 2007, he has been a Professor of Physics at ESPCI Paris. His research activity is carried out at the Langevin Institute (http://www.institut-langevin. espci.fr), where he leads the group of Mesoscopic and Theoretical Optics. His works have covered the fields of nanophotonics, plasmonics and light scattering in disordered media. Rémi Carminati received the Fabry-de-Gramont prize of the French Optical Society in 2006 and the Research award from the iXCore Research Foundation in 2009. He was elected a Fellow of the Optical Society of America in 2015.
For additional information:
Aristide Dogariu
CREOL Distinguished Seminar: "Time Reversal and Holography with Time Transformations" by Mathias Fink, 3.16.17/4:40PM-5:30PM/CREOL RM 103
CREOL Distinguished Seminar: "Time Reversal and Holography with Time Transformations" by Mathias Fink
Thursday, March 16, 2017 4:30 PM to 5:30 PM
HEC Room 125
HEC Room 125
Mathias FinkLangevin Institute
Abstract :
Because time and space play a similar role in wave propagation, wave control can be achieved or by manipulating spatial boundaries or by manipulating time boundaries. Here we emphasize the role of time boundaries manipulation. We show that sudden changes of the medium properties generate instant wave sources that emerge instantaneously from the entire wavefield and can be used to control wavefield and to revisit the holographic principles and the way to create time-reversed waves. Experimental demonstrations of this approach with water waves will be presented and the extension of this concept to acoustic and electromagnetic waves will be discussed. More sophisticated time manipulations can also be studied in order to extend the concept of photonic crystals and wave localization in the time domain.
Biography:
Mathias Fink is a professor of physics at the Ecole Superieure de Physique et de Chimie Industrielles de la Ville de Paris (ESPCI ParisTech), Paris, France. In 1990 he founded the Laboratory Ondes et Acoustique at ESPCI that became in 2009 the Langevin Institute. In 2002, he was elected at the French Academy of Engineering, in 2003 at the French Academy of Science and in 2008 at the College de France on the Chair of Technological Innovation. He has received several scientific awards as the CNRS medal of innovation, the Rayleigh Award of the IEEE Ultrasonics Society (2012), the ERC SYNERGY Grant (European Research Council) for the HELMHOLTZ project (2013) and the Edwin H. Land Medal of the Optical Society of America (OSA), 2014
Mathias Fink’s area of research is concerned with the propagation of waves in complex media and the development of numerous instruments based on this basic research. His current research interests include time-reversal in physics, wave control in complex media, super-resolution, metamaterials, multiwave imaging, and telecommunications. He has developed different techniques in medical imaging (ultrafast ultrasonic imaging, transient elastography, supersonic shear imaging). He holds more than 70 patents, and he has published more than 400 peer reviewed papers and book chapters. 6 start-up companies with more than 300 employees have been created from his research (Echosens, Sensitive Object, Supersonic Imagine, Time Reversal Communications, CardiaWave and GreenerWave).
For additional information:
Aristide Dogariu
Thursday, February 23, 2017
LPTH Press Release: LightPath Technologies to Present at 29th Annual ROTH Conference
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Wednesday, February 22, 2017
Seminar: "New Paradigm for multi-TW MWIR and LWIR Atmospheric Propagation over Kilometer Ranges" by Jerome V. Moloney, 3.6.17/12:00PM-1:00PM/CREOL RM
Seminar: "New Paradigm for multi-TW MWIR and LWIR Atmospheric Propagation over Kilometer Ranges" by Jerome V. Moloney
Monday, March 6, 2017 12:00 PM to 1:00 PM
CREOL Room 103
CREOL Room 103
Jerome V. Moloney
Abstract:
A fundamentally new set of paradigms for sustaining individual MWIR and LWIR multi-TW light bullets over multiple kilometer range propagation distances in the atmosphere are identified. The physics can now be described by an optical carrier resolved generalized Modified Kadomtsev Petviashili (MKP) equation derivable from our UPPE model. Two competing singularities emerge 1) the usual self-focusing collapse associated with the Nonlinear Schroedinger equation and 2) an optical carrier wave shock singularity. For MWIR wavelength pulses the latter introduces a new regularization mechanism involving recurrent bursts of shock initiated (dispersive) harmonic waves limiting peak intensities, reducing ionization and eliminating the need for artificial nonlinear saturation effects. Additional new physics emerges as one moves from MWIR to LWIR wavelengths. Many-body effects associated with Coulomb scattering of weakly ionized electrons associated with spatially separated gas species become dominant and a new mechanism emerges which suppresses the standard Kerr nonlinear self-focusing. Now whole beam self-trapping becomes the dominant pulse transport mechanism replacing nonlinear filamentation. We predict that multi-TW, multi-Joule pulses can be sustained over multiple kilometer ranges. We will present simulations for MWIR and LWIR pulses propagating in two atmospheric transmission windows.
Biography:
Jerome V Moloney is a Professor of Mathematics and Optical Sciences at the University of Arizona and is Director of the Arizona Center for Mathematical Sciences, an internationally recognized research center in applied mathematics. He is a fellow of the Optical Society of America and a recipient of the Alexander von Humboldt Prize in physics. Research interests span a wide range of photonics and nonlinear optics fields including ultrashort, high power femtosecond pulse propagation; computational nanophotonics, fiber laser modeling, many-body physics of semiconductor optical properties and modeling semiconductor passive and active devices. He has published more than 450 papers in peer-reviewed journals and has given over two hundred invited papers at national and international conferences.
For additional information:
Demetrios Christodoulides
Saturday, February 18, 2017
IEEE/CREOL/NSTC - Distinguish Lecture - Prof. Andrea Alu from UT-Austin, February 21, 2017, 11 am, CREOL Room 103
Andrea Alù, Ph.D.
Department of Electrical and Computer Engineering
The University of Texas at Austin
Tuesday February 21, 2017
11:00AM — 12:00PM
CREOL
Room 103
Light refreshments will be served.
From Cloaking to One-Way Propagation: the Fascinating Physics and Engineering of Metamaterials
Metamaterials are artificial materials with properties well beyond what offered by nature, providing unprecedented opportunities to tailor and enhance the interaction between waves with materials. In this talk, I discuss our recent research activity in electromagnetics, nano-optics, acoustics and mechanics, showing how suitably tailored meta-atoms and arrangements of them open exciting venues to manipulate and control waves in unprecedented ways. I will discuss our recent theoretical and experimental results, including metamaterials for scattering suppression, nanostructures and metasurfaces to control wave propagation and radiation, large nonreciprocity without magnetism, giant nonlinearities in properly tailored metamaterials, and parity-time symmetric meta-atoms and metasurfaces. Physical insights into these exotic phenomena, new devices based on these concepts, and their impact on technology will be discussed during the talk.
Biography: Andrea Alù is the Temple Foundation Endowed Professor #3 at the University of Texas at Austin. He received his Laurea (2001) and PhD (2007) from the University of Roma Tre, Italy, and, after a postdoc at the University of Pennsylvania, he joined the faculty of the University of Texas at Austin in 2009. His current research interests span over a broad range of areas, including metamaterials and plasmonics, electromagnetics, nano-optics, photonics and acoustics. Dr. Alù is a Fellow of IEEE, OSA, and APS, and has received several scientific awards, including the NSF Alan T. Waterman award (2015), the OSA Adolph Lomb Medal (2013), and the URSI Issac Koga Gold Medal (2011) .
For further information please click link below: http://www.nanoscience.ucf. edu/news/events.php
Contact:
Debashis Chanda, Ph.D.
Raj Mittra
RAJ MITTRA DISTINGUISHED LECTURE PROGRAM
CREOL
NanoScience Technology Center
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