سخنرانان مدعو

 | تاریخ ارسال: 1399/11/2 | 
زمان‌بندی سخنرانی‌ها و لینک‌ ورود به وبینار

Prof. Gerd Leuchs

Professor Mohammad Kazem Moravvej-Farshi
Tarbiat Modares University, Faculty of Electrical and Computer Engineering
TALK: Electrically Driven Lab-on-a-Chip Laser-Free Plasmonic Tweezers
 
Plasmonic tweezers have been recognized as an efficient and attractive tool for on chip manipulation of target micro/nanoparticles in microfluidic channels, owing to their inherently high field confinement and field enhancement, as compared with bulky optical tweezers. Moreover, they are needless to any complicated optics and optomechanical equipment, which allows optophoresis systems with smaller dimensions, suitable for lab-on-a-chip applications. Nonetheless, realizing a plasmonic structure on a semiconductor light source leads to a compact plasmonic tweezers module, in which surface plasmons can form in the vicinity of the built-in light emitting active region. The design of an appropriate plasmonic structure can couple the plasmonic field to the fluidic channel side efficiently, realizing plasmonic tweezing of target particles. Nonetheless, the realization of a plasmonic unit on a semiconductor light source leads to a compact plasmonic tweezers module, in which surface plasmons can form in the vicinity of the built-in light emitting active region. The goal of this talk is to introduce two types of integrated laser-free plasmonic tweezers. Each of these newly designed tweezers has a built-in optical source, substituting for the external laser, can function by a low applied voltage. These pave the way for developing a new generation of compact, miniaturized, low-power plasmonic tweezers modules in lab-on-chip applications.

Prof. Gerd Leuchs

Professor Gerd Leuchs
Max Planck Institute for the Science of Light
Institute of Applied Physics of the Russian Academy of Sciences
Department of Physics, University Erlangen-Nürnberg
Department of Physics, University of Ottawa
TALK: Interferometry - what can be gained
by using nonlinear instead of linear beam splitters
Interference is probably the most striking phenomenon in any wave dynamics. In optics interference happens whenever light originating from one point in space propagates over different paths, which are then again superimposed. A spectrometer is a prototype example for such interference. Here, we will concentrate on the conceptually most simple interferometer with one beam splitter dividing the incoming light in two different paths and recombining them on a second beam splitter. This allows for sensitive measurements with interferometric precision, of spatial displacements, forces, gas concentrations, refractive indices et cetera. In all these cases, the beam splitters are typically linear optical elements.
There is, however, a different type of beam splitter, which splits a higher energy photon into two lower energy photons complying with energy conservation. The process is called parametric down conversion (PDC) and one of the pioneers was David Klyshko at Lomonosov University in Moscow.
These two beam splitters are dramatically different in the following sense: suppose one photon enters the beam splitter through one of the two input ports. Then you find the following situation at the two output ports:
 
(1) in the case of the linear beam splitter; a super position of (a) one photon in one output port and none in the other one, and (b) no photon in the one output port and one in the other one.
(2) in the case of the nonlinear beam splitter; exactly one photon at each output port.
 
When one attempts to measure the light at the output, the result will be noisy in case (1) in the sense that the measurement result is uncertain, while in case (2) the result is well defined and not noisy. One may therefore speculate that case (2) will allow for higher precision and this is indeed true in some cases. Motivated by the group theoretical descriptions, case (1) is called a SU(2)-interferometer and case (2) a SU(1,1)-interfero–meter. The lecture will review some experiments as well as the Wigner function descriptions of these different interferometers.


Prof. Gerd Leuchs

Professor Robert Boyd
University of Ottawa, Ottawa, ON, Canada
University of Rochester, Rochester, NY, USA
TALK: Designer Materials for Photonics
 
We review approaches for the creation of artificial materials, often called metamaterials, for use in photonics.  We especially highlight materials, known as epsilon-near-zero (ENZ) materials, for which the dielectric permittivity epsilon takes on a very small values. We give examples of ENZ materials and their properties and we describe their usefulness in the fabrication of photonic devices.
 

Prof. Gerd Leuchs

Professor Ebrahim Karimi
Canada Research Chair in Structured Light
Department of Physics and Max Planck Centre for Extreme and Quantum Photonics,
University of Ottawa,
Ottawa, Canada

TALK: Engineering Photons: From Knots to Processing Quantum Information
 
Photons, the quanta of light, are widely used and are the backbones of numerous modern technologies -- a variety of applications ranging from meteorology to communication and beyond. To employ photons in all these advanced technologies, one must profoundly understand the physics of their behaviour, control, and detect them. In my talk, I will review and discuss all photonics degrees of freedom and how we can generate, manipulate, and detect them in the laboratory in the realm of quantum physics. I will explain and describe a few recent experiments conducted in my group, including interaction-free ghost-imaging, photonics-based quantum simulation, as well as our current efforts in free-space and underwater quantum key distribution.
 

Prof. Gerd Leuchs

Dr. Asghar Gholami
Department of Electrical and Computer Engineering, Isfahan University of Technology
TALK: Optical Camera Communications 
 Nowadays, optical camera communication (OCC) as a part of emerging optical wireless communications (OWC) technology, have attracted particular interest in areas such as the internet of things, transmissions and localization in indoor as well as outdoor short-range applications, motion capture, and intelligent transportation systems. Considering recent developments in cameras and image sensors technology and the use of small cameras in smart devices and vehicles, OCC is likely to be the dominant future technology for many applications and it is recently considered within the framework of the IEEE 802.15.7m standardization.

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پوستر کنفرانس

ICOP 2021

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opsi

khu

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