Engineering and guiding light by artificial structures is one of the most actual questions in photonics, allowing optical information processing to open new horizons for waveguiding, storing, and processing light.
Three-dimensional structures have been a challenge up to now, either due to the complex formation method or the lack of appropriate material. Especially the creation complex quasi crystals that have a number of advantages features as e.g. better control of the transmission features by larger und more homogeneously distributed band gaps, is an actual challenge.
A combined effort of researchers from "Institut für Angewandte Physik" and "Center for Nonlinear Science", Westfaelische Wilhelms-Universitaet Muenster (WWU), Germany and Department of Physics, Indian Institute of Technology Delhi, India, shines the way for a versatile approach to form complex 3D quasi-crystallographic photonic crystals structures formed by light. The researchers have experimentally demonstrated for the first time the creation of 3D photonic crystals and quasicrystals with a plethora of geometries and forms purely by the action of light in a nonlinear optical - so-called photorefractive- material, which allows reconfigurable as well as scalable crystal and quasicrystal formation.
"Creating photonic crystals by light itself is a wonderful example on how light matter interaction can be exploited" said Prof. Dr. Cornelia Denz, Director of the Institute for Applied Physics and Leader of the Center for Nonlinear Science, WWU, who supervised the research team. "Novel three-dimensional photonic structures with reconfigurable features for photonic device integration is a hot topic among the research community. Exploiting the principle of 'light is controlling light', our complex three-dimensional photonic quasicrystals will allow forming a reconfigurable platform to investigate advanced nonlinear light-matter interactions in higher spatial dimensions" emphasized Prof. Denz.
By modifying a laser light beam by a spatial light modulator, and subsequently sculting a nonlinear optical material with this light structure, the research team could easily generate artificial refractive index photonic structures. Typically, neither any additional optical component nor manipulation of the experimental setup is involved while reconfiguring from one structure to another.
"The success of this versatile experimental innovation paves the way to the mass production of scalable large area quasi-crystallographic photonic templates. This in turn points to the realization of complex artificial photonic bandgap structures for promising applications as e.g. highly efficient flat-panel displays with customized angular emission," commented Dr. Joby Joseph, Associate Professor of Physics, Photonics Group, Indian Institute of Technology Delhi, India, who coordinated the collaborative efforts from India.
The researchers elaborate their work in the journal "Advanced Materials" (Vol.22, No.3, pp.356-360; DOI: 10.1002/adma.200901792) where Jolly Xavier as the lead author together with Martin Boguslawski, Patrick Rose, Dr. Joby Joseph, and Prof. Dr. Cornelia Denz, describe their research details. The research was partially funded by German Academic Exchange Service.
Dr. Christina Heimken | idw
Climate cycles may explain how running water carved Mars' surface features
02.12.2016 | Penn State
What do Netflix, Google and planetary systems have in common?
02.12.2016 | University of Toronto
A multi-institutional research collaboration has created a novel approach for fabricating three-dimensional micro-optics through the shape-defined formation of porous silicon (PSi), with broad impacts in integrated optoelectronics, imaging, and photovoltaics.
Working with colleagues at Stanford and The Dow Chemical Company, researchers at the University of Illinois at Urbana-Champaign fabricated 3-D birefringent...
In experiments with magnetic atoms conducted at extremely low temperatures, scientists have demonstrated a unique phase of matter: The atoms form a new type of quantum liquid or quantum droplet state. These so called quantum droplets may preserve their form in absence of external confinement because of quantum effects. The joint team of experimental physicists from Innsbruck and theoretical physicists from Hannover report on their findings in the journal Physical Review X.
“Our Quantum droplets are in the gas phase but they still drop like a rock,” explains experimental physicist Francesca Ferlaino when talking about the...
The Max Planck Institute for Physics (MPP) is opening up a new research field. A workshop from November 21 - 22, 2016 will mark the start of activities for an innovative axion experiment. Axions are still only purely hypothetical particles. Their detection could solve two fundamental problems in particle physics: What dark matter consists of and why it has not yet been possible to directly observe a CP violation for the strong interaction.
The “MADMAX” project is the MPP’s commitment to axion research. Axions are so far only a theoretical prediction and are difficult to detect: on the one hand,...
Broadband rotational spectroscopy unravels structural reshaping of isolated molecules in the gas phase to accommodate water
In two recent publications in the Journal of Chemical Physics and in the Journal of Physical Chemistry Letters, researchers around Melanie Schnell from the Max...
The efficiency of power electronic systems is not solely dependent on electrical efficiency but also on weight, for example, in mobile systems. When the weight of relevant components and devices in airplanes, for instance, is reduced, fuel savings can be achieved and correspondingly greenhouse gas emissions decreased. New materials and components based on gallium nitride (GaN) can help to reduce weight and increase the efficiency. With these new materials, power electronic switches can be operated at higher switching frequency, resulting in higher power density and lower material costs.
Researchers at the Fraunhofer Institute for Solar Energy Systems ISE together with partners have investigated how these materials can be used to make power...
16.11.2016 | Event News
01.11.2016 | Event News
14.10.2016 | Event News
02.12.2016 | Medical Engineering
02.12.2016 | Agricultural and Forestry Science
02.12.2016 | Physics and Astronomy