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

Hu, Lei, Xie, Kang, Hu, Zhijia, Mao, Qiuping, Xia, Jiangying, Jiang, Haiming, Zhang, Junxi, Wen, Jianxiang and Chen, Jingjing (2018). Experimental observation of wave localization at the Dirac frequency in a two-dimensional photonic crystal microcavity. Optics Express, 26 (7), pp. 8213-8223.


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: Engineering & Applied Sciences
Engineering & Applied Sciences > Institute of Photonics
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.
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Related URLs: https://www.osa ... ri=oe-26-7-8213 (Publisher URL)
Published Date: 2018-04-02
Authors: Hu, Lei
Xie, Kang
Hu, Zhijia ( 0000-0002-8960-5318)
Mao, Qiuping
Xia, Jiangying
Jiang, Haiming
Zhang, Junxi
Wen, Jianxiang
Chen, Jingjing



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