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Control of Modes Coupling in Photonic Crystal Waveguides by Introducing Asymmetry and Long Periodicity

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The control of modes coupling in photonic crystal waveguides (PCWGs) is quite important because it's the basic working mechanism of many devices in optical integrative circuits, such as filters, switches, optical add drop multiplexers (OADMs), etc. Up to now, the researches of this area mostly focus on the modes coupling between two parallel PCWGs or between PCWGs and resonance cavities. In this paper, we proposed a new way of controlling modes coupling in PCWGs by introducing asymmetry and long periodicity. Because of the presence of asymmetry and long periodicity in PCWGs, some interesting modes coupling phenomena, which used to be forbidden in normal PCWGs, happen. Then a filter with a 1.42 nm full-width at the half value (FWHM) and an OADM with a 1.31 nm FWHM and a 0.34 dB insertion loss have been designed by utilizing the new modes coupling phenomena. Our researches not only provide a new way of controlling modes coupling in PCWGs but also benefit the design of many devices in optical integrative circuits greatly.


Document Type: Research Article


Publication date: 2010-11-01

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  • Journal for Nanoscience and Nanotechnology (JNN) is an international and multidisciplinary peer-reviewed journal with a wide-ranging coverage, consolidating research activities in all areas of nanoscience and nanotechnology into a single and unique reference source. JNN is the first cross-disciplinary journal to publish original full research articles, rapid communications of important new scientific and technological findings, timely state-of-the-art reviews with author's photo and short biography, and current research news encompassing the fundamental and applied research in all disciplines of science, engineering and medicine.
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