Fiber guiding at the Dirac frequency beyond photonic bandgaps

Kang Xie; Wei Zhang; Allan D Boardman; Haiming Jiang; Zhijia Hu; Yong Liu; Ming Xie; Qiuping Mao; Lei Hu; Qian Li; Tianyu Yang; Fei Wen; Erlei Wang

doi:10.1038/lsa.2015.77

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Fiber guiding at the Dirac frequency beyond photonic bandgaps

Original Articles

- Fiber guiding at the Dirac frequency beyond photonic bandgaps
- Light: Science & Applications Vol. 4, Issue 3, (2015)
- Affiliations：
  
  1.School of Instrument Science and Opto-electronic Engineering, Hefei University of Technology, Hefei, Anhui 230009, China
  2.Department of Physics, University of Salford, Salford, Manchester M5 4WT, UK
  3.Department of Polymer Science and Engineering, University of Science and Technology of China, Hefei, Anhui 230026, China
  4.School of Optoelectronic Information, University of Electronic Science and Technology of China, Chengdu, Sichuan 610054, China
- Author bio：
  
  K Xie, Email: kangxie@hfut.edu.cn
  HM Jiang, Email: hmjiang@hfut.edu.cn
  ZJ Hu, Email: zhijiahu@hfut.edu.cn
- Funds：
- DOI：10.1038/lsa.2015.77
  CLC：
- Published：2015-09，
  
  Published Online：31 March 2015，
  
  Received：17 August 2014，
  
  Revised：17 March 2015，
  
  Accepted：26 March 2015
- Accepted：
Scan QR Code
Xie, K. et al. Fiber guiding at the Dirac frequency beyond photonic bandgaps. Light: Science & Applications, 4, e304 (2015).
DOI：

Xie, K. et al. Fiber guiding at the Dirac frequency beyond photonic bandgaps. Light: Science & Applications, 4, e304 (2015). DOI： 10.1038/lsa.2015.77.

摘要

Abstract

Light trapping within waveguides is a key practice of modern optics

both scientifically and technologically. Photonic crystal fibers traditionally rely on total internal reflection (index-guiding fibers) or a photonic bandgap (photonic-bandgap fibers) to achieve field confinement. Here

we report the discovery of a new light trapping within fibers by the so-called Dirac point of photonic band structures. Our analysis reveals that the Dirac point can establish suppression of radiation losses and consequently a novel guided mode for propagation in photonic crystal fibers. What is known as the Dirac point is a conical singularity of a photonic band structure where wave motion obeys the famous Dirac equation. We find the unexpected phenomenon of wave localization at this point beyond photonic bandgaps. This guiding relies on the Dirac point rather than total internal reflection or photonic bandgaps

thus providing a sort of advancement in conceptual understanding over the traditional fiber guiding. The result presented here demonstrates the discovery of a new type of photonic crystal fibers

with unique characteristics that could lead to new applications in fiber sensors and lasers. The Dirac equation is a special symbol of relativistic quantum mechanics. Because of the similarity between band structures of a solid and a photonic crystal

the discovery of the Dirac-point-induced wave trapping in photonic crystals could provide novel insights into many relativistic quantum effects of the transport phenomena of photons

phonons

and electrons.

关键词

Keywords

band structureDirac equationoptical fiberoptical modephotonic crystal

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