Journal
OPTICS EXPRESS
Volume 26, Issue 7, Pages 8213-8223Publisher
OPTICAL SOC AMER
DOI: 10.1364/OE.26.008213
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Funding
- National Natural Science Foundation of China [11574070, 11404087, 11404086, 51771186]
- Fundamental Research Funds for the Central Universities [JZ2017HGTB0187, PA2017GDQT0024]
- China Postdoctoral Science Foundation [2015M571918, 2017T100442]
- European Union's Horizon research and innovation programme under the Marie Sklodowska-Curie grant [744817]
- STCSM
- Natural Science Foundation of Anhui Province [1508085QA23]
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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. (C) 2018 Optical Society of America under the terms of the OSA Open Access Publishing Agreement
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