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Papers by Professor Christodoulides' research group appear in Nature Photonics & Nature Communications

A paper titled "Externally refuelled optical filaments" by Maik Scheller, Matthew S. Mills, Mohammad-Ali Miri, Weibo Cheng, Jerome V. Moloney, Miroslav Kolesik, Pavel Polynkin and Demetrios N. Christodoulides was published on line in Nature Photonics. 

Abstract: Plasma channels produced in air through femtosecond laser filamentation hold great promise for a number of applications, including remote sensing, attosecond physics and spectroscopy, channelling microwaves and lightning protection. In such settings, extended filaments are desirable, yet their longitudinal span is limited by dissipative processes. Although various techniques aiming to prolong this process have been explored, the substantial extension of optical filaments remains a challenge. Here, we experimentally demonstrate that the natural range of a plasma column can be enhanced by at least an order of magnitude when the filament is prudently accompanied by an auxiliary beam. In this arrangement, the secondary low-intensity ‘dressing’ beam propagates linearly and acts as a distributed energy reservoir, continuously refuelling the optical filament. Our approach offers an efficient and viable route towards the generation of extended light strings in air without inducing premature wave collapse or an undesirable beam break-up into multiple filaments.

This paper is also highlighted in the same issue of Nature Photonics News and Views in a paper titled "Optical physics: Extending filamentation" by Günter Steinmeyer & Carsten Brée

In addition, another paper by Professor Christodoulides' research group has been published in Nature Communications: "Supersymmetric mode converters" by Matthias Heinrich, Mohammad-Ali Miri, Simon Stützer, Ramy El-Ganainy, Stefan Nolte, Alexander Szameit & Demetrios N. Christodoulides.

Abstract: Originally developed in the context of quantum field theory, the concept of supersymmetry can be used to systematically design a new class of optical structures. In this work, we demonstrate how key features arising from optical supersymmetry can be exploited to control the flow of light for mode-division multiplexing applications. Superpartner configurations are experimentally realized in coupled optical networks, and the corresponding light dynamics in such systems are directly observed. We show that supersymmetry can be judiciously used to remove the fundamental mode of a multimode optical structure while establishing global phase-matching conditions for the remaining set of modes. Along these lines, supersymmetry may serve as a promising platform for versatile optical components with desirable properties and functionalities. 

See related news story here and "Scientists developing laser that could control the weather" from Yahoo News.


Posted Friday, April 18, 2014

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