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On-chip topological light
Date:8/1/2014

and delay for edge-state light and for bulk-route light (3). The paper is notable enough to have received an "editor's suggestion" designation. "Apart from the potential photonic-chip applications of this scheme," said Hafezi, "this photonic platform could allow us to investigate fundamental quantum transport properties."

Another measured quality is consistency. Sunil Mittal, a graduate student at the University of Maryland and first author on the paper, points out that microchip manufacturing is not a perfect process. "Irregularities in integrated photonic device fabrication usually result in device-to-device performance variations," he said. And this usually undercuts the microchip performance. But with topological protection (photons traveling at the edge of the array are practically invulnerable to impurities) at work, consistency is greatly strengthened.

Indeed, the authors, reporting trials with numerous array samples, reveal that for light taking the bulk (interior) route in the array, the delay and transmission of light can vary a lot, whereas for light making the edge route, the amount of energy loss is regularly less and the time delay for signals more consistent. Robustness and consistency are vital if you want to integrate such arrays into photonic schemes for processing quantum information.

How does the topological property emerge at the microscopic level? First, look at the electron topological behavior, which is an offshoot of the quantum Hall effect. Electrons, under the influence of an applied magnetic field can execute tiny cyclonic orbits. In some materials, called topological insulators, no external magnetic field is needed since the necessary field is supplied by spin-orbit interactions---that is, the coupling between the orbital motion of electrons and their spins. In these materials the conduction regime is topological: the material is conductive around the edge but is an insulator in the interior.
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Contact: Phillip F. Schewe
pschewe@umd.edu
301-405-0989
Joint Quantum Institute
Source:Eurekalert  

Page: 1 2 3

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