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Primeur weekly 2018-03-05

Quantum computing

Want more efficient simulators? Store time in a quantum superposition ...

Experimentally demonstrated a toffoli gate in a semiconductor three-qubit system ...

Individual quantum dots imaged in 3D for first time ...

Artificial intelligence techniques reconstruct mysteries of quantum systems ...

Majorana runners go long range: New topological phases of matter unveiled ...

Focus on Europe

University of Groningen to organize Second Information Universe Conference ...

IEEE eScience 2018 calls for contributions ...

Harvey Meyer is awarded an ERC Consolidator Grant for fundamental calculations on strong interaction effects ...

BSC presents SuperGeek, a mascot to bring supercomputers closer to the youngest ...

Call for Participation to European Forum about "Shaping Europe's Digital Future - HPC for Extreme Scale Scientific and Industrial Applications" ...

Data management and computing infrastructure procurement broadly serves Finnish research ...

Hardware

High demand from commercial customers to boost growth in global supercomputer market ...

OCF deploys UK academia's first IBM POWER9 systems ...

Niagara is Canada's most powerful research supercomputer fuelling Canadian innovation and discovery ...

CENIC recognizes UCSC's Hyades supercomputer cluster connection ...

CoolIT Systems reports 60% revenue growth in 2017 ...

SPEC offers HPG benchmarks free of charge to qualified non-profit organisations worldwide ...

Applications

Supercomputer model reveals how sticky tape makes graphene ...

Concertio launches Optimizer Studio to help performance engineers and IT professionals achieve peak system performance ...

Sandia researcher Jacqueline Chen elected to National Academy of Engineering ...

Oak Ridge National Laboratory uses supercomputers to simulate radiation transport and to understand the dynamic interactions among ions, solids and liquids ...

Mining hardware helps scientists gain insight into silicon nanoparticles ...

Can strongly lensed type 1a supernovae resolve cosmology's biggest controversy? ...

Give your research a boost at the SURF Research Bootcamp ...

TOP500

Supercomputing under a new lens: A Sandia-developed benchmark re-ranks top computers ...

The Cloud

Alibaba Cloud launches Cloud and AI solutions in Europe including bare metal HPC services ...

KIT helps build the European Open Science Cloud ...

Mining hardware helps scientists gain insight into silicon nanoparticles

2 Mar 2018 Saint Petersburg - Researchers first developed a three-dimensional dynamic model of an interaction between light and nanoparticles. They used a supercomputer with graphic accelerators for calculations. Results showed that silicon particles exposed to short intense laser pulses lose their symmetry temporarily. Their optical properties become strongly heterogeneous. Such a change in properties depends on particle size, therefore it can be used for light control in ultrafast information processing nanoscale devices. The study is published inAdvanced Optical Materials.

Improvement of computing devices today requires further acceleration of information processing. Nanophotonics is one of the disciplines that can solve this problem by means of optical devices. Although optical signals can be transmitted and processed much faster than electronic ones, first, it is necessary to learn how to quickly control light on a small scale. For this purpose, one could use metal particles. They localize light efficiently, yet weaken the signal eventually causing significant losses. However, dielectric and semiconducting materials, such as silicon, can be used instead of metal.

Silicon nanoparticles are now actively studied by researchers all around the world, including ITMO University. The long-term goal of such studies is to create an ultrafast compact modulators for optical signal. They can serve as a basis for computers of the future. However, this technology will become feasible only once we understand how nanoparticles interact with light.

"When a laser pulse hits the particle, a lot of free electrons are formed inside", explained Sergey Makarov, head of the Laboratory of Hybrid Nanophotonics and Optoelectronics of ITMO University. "As a result a region saturated with oppositely charged particles is created. It is usually called an electron-hole plasma. Plasma changes optical properties of particles and up to now everybody believed that it happens with the whole particle simultaneously, so that the symmetry is preserved. We showed that this is not entirely true and an even distribution of the plasma inside particles is not the only possible scenario."

Scientists found that an electromagnetic disturbance caused by interaction between light and particles has a more complex structure. This leads to a light distortion, varying with time. Therefore, the symmetry of particles breaks and optical properties become different throughout one particle. "Using analytical and numerical methods we first looked inside the particle and saw that processes taking place there are far more complicated than we thought", stated Konstantin Ladutenko, a member of the International Research Center of Nanophotonics and Metamaterials of ITMO University. "Moreover, we found that by changing the particle size, we can affect its interaction with the light signal. So, we might be able to predict the signal path in a entire system of nanoparticles."

In order to create a tool to study processes inside nanoparticles, scientists from ITMO University joined forces with colleagues from Jean Monnet University in France. "We proposed analytical methods to determine particle size and refractive index, which might provide a change in optical properties. Afterwards, with powerful computational methods we tracked processes inside particles. Our colleagues did calculations on a computer with graphics accelerators. Such computers are often used for cryptocurrency mining. However, we decided to enrich humanity with new knowledge, rather than enrich ourselves. What is more, bitcoin rate just started to fall then", added Konstantin Ladutenko.

Devices based on such nanoparticles may become basic elements of optical computers, just as transistors now are basic elements of electronics. They will make it possible to distribute and redirect or branch the signal. "Such asymmetric structures have a variety of applications yet we focus on ultra-fast signal processing", continued Sergey Makarov. "Now we have a powerful theoretical tool which will help us to develop a quick and compact light management system."

The paper titled " Photogenerated Free Carrier-Induced Symmetry Breaking in Spherical Silicon Nanoparticle " was authored by A. Rudenko, K. Ladutenko, S. Makarov, and T. Itina. It has been published inAdvanced Optical Materialson January 29, 2018.

Source: ITMO University

Back to Table of contents

Primeur weekly 2018-03-05

Quantum computing

Want more efficient simulators? Store time in a quantum superposition ...

Experimentally demonstrated a toffoli gate in a semiconductor three-qubit system ...

Individual quantum dots imaged in 3D for first time ...

Artificial intelligence techniques reconstruct mysteries of quantum systems ...

Majorana runners go long range: New topological phases of matter unveiled ...

Focus on Europe

University of Groningen to organize Second Information Universe Conference ...

IEEE eScience 2018 calls for contributions ...

Harvey Meyer is awarded an ERC Consolidator Grant for fundamental calculations on strong interaction effects ...

BSC presents SuperGeek, a mascot to bring supercomputers closer to the youngest ...

Call for Participation to European Forum about "Shaping Europe's Digital Future - HPC for Extreme Scale Scientific and Industrial Applications" ...

Data management and computing infrastructure procurement broadly serves Finnish research ...

Hardware

High demand from commercial customers to boost growth in global supercomputer market ...

OCF deploys UK academia's first IBM POWER9 systems ...

Niagara is Canada's most powerful research supercomputer fuelling Canadian innovation and discovery ...

CENIC recognizes UCSC's Hyades supercomputer cluster connection ...

CoolIT Systems reports 60% revenue growth in 2017 ...

SPEC offers HPG benchmarks free of charge to qualified non-profit organisations worldwide ...

Applications

Supercomputer model reveals how sticky tape makes graphene ...

Concertio launches Optimizer Studio to help performance engineers and IT professionals achieve peak system performance ...

Sandia researcher Jacqueline Chen elected to National Academy of Engineering ...

Oak Ridge National Laboratory uses supercomputers to simulate radiation transport and to understand the dynamic interactions among ions, solids and liquids ...

Mining hardware helps scientists gain insight into silicon nanoparticles ...

Can strongly lensed type 1a supernovae resolve cosmology's biggest controversy? ...

Give your research a boost at the SURF Research Bootcamp ...

TOP500

Supercomputing under a new lens: A Sandia-developed benchmark re-ranks top computers ...

The Cloud

Alibaba Cloud launches Cloud and AI solutions in Europe including bare metal HPC services ...

KIT helps build the European Open Science Cloud ...