Experimental observation of wave localization at the Dirac frequency in a two-dimensional photonic crystal microcavity


Trapping light within cavities or waveguides in photonic crystals is an effective technology in modern integrated optics. Traditionally, cavities rely on total internal reflection or a photonic bandgap to achieve field confinement. Recent investigations have examined new localized modes that occur at a Dirac frequency that is beyond any complete photonic bandgap. We design Al2O3 dielectric cylinders placed on a triangular lattice in air, and change the central rod size to form a photonic crystal microcavity. It is predicted that waves can be localized at the Dirac frequency in this device without photonic bandgaps or total internal reflections. We perform a theoretical analysis of this new wave localization and verify it experimentally. This work paves the way for exploring localized defect modes at the Dirac point in the visible and infrared bands, with potential applicability to new optical devices.

Publication DOI: https://doi.org/10.1364/OE.26.008213
Divisions: College of Engineering & Physical Sciences
College of Engineering & Physical Sciences > Aston Institute of Photonics Technology (AIPT)
Additional Information: © 2018 Optical Society of America under the terms of the OSA Open Access Publishing Agreement. An OSA-formatted open access journal article PDF may be governed by the OSA Open Access Publishing Agreement signed by the author and any applicable copyright laws. Authors and readers may use, reuse, and build upon the article, or use it for text or data mining without asking prior permission from the publisher or the Author(s), as long as the purpose is non-commercial and appropriate attribution is maintained.
Publication ISSN: 1094-4087
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Related URLs: https://www.osa ... ri=oe-26-7-8213 (Publisher URL)
PURE Output Type: Article
Published Date: 2018-04-02
Published Online Date: 2018-03-21
Accepted Date: 2018-03-17
Authors: Hu, Lei
Xie, Kang
Hu, Zhijia (ORCID Profile 0000-0002-8960-5318)
Mao, Qiuping
Xia, Jiangying
Jiang, Haiming
Zhang, Junxi
Wen, Jianxiang
Chen, Jingjing



Version: Published Version

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