中国物理B ›› 2016, Vol. 25 ›› Issue (10): 107102-107102.doi: 10.1088/1674-1056/25/10/107102

• CONDENSED MATTER: ELECTRONIC STRUCTURE, ELECTRICAL, MAGNETIC, AND OPTICAL PROPERTIES • 上一篇    下一篇

Observation of trapped light induced by Dwarf Dirac-cone in out-of-plane condition for photonic crystals

Subir Majumder, Tushar Biswas, Shaymal K Bhadra   

  1. Fiber Optics and Photonics Division, CSIR-Central Glass and Ceramic Research Institute, 196, Kolkata 700032, India
  • 收稿日期:2016-02-17 修回日期:2016-06-23 出版日期:2016-10-05 发布日期:2016-10-05
  • 通讯作者: Shaymal K Bhadra E-mail:skbhadra@cgcri.res.in
  • 基金资助:
    Project supported by Director, CSIR-CGCRI, the DST, Government of India, and the CSIR 12th Plan Project (GLASSFIB), India.

Observation of trapped light induced by Dwarf Dirac-cone in out-of-plane condition for photonic crystals

Subir Majumder, Tushar Biswas, Shaymal K Bhadra   

  1. Fiber Optics and Photonics Division, CSIR-Central Glass and Ceramic Research Institute, 196, Kolkata 700032, India
  • Received:2016-02-17 Revised:2016-06-23 Online:2016-10-05 Published:2016-10-05
  • Contact: Shaymal K Bhadra E-mail:skbhadra@cgcri.res.in
  • Supported by:
    Project supported by Director, CSIR-CGCRI, the DST, Government of India, and the CSIR 12th Plan Project (GLASSFIB), India.

摘要: Existence of out-of-plane conical dispersion for a triangular photonic crystal lattice is reported. It is observed that conical dispersion is maintained for a number of out-of-plane wave vectors (kz). We study a case where Dirac like linear dispersion exists but the photonic density of states is not vanishing, called Dwarf Dirac cone (DDC) which does not support localized modes. We demonstrate the trapping of such modes by introducing defects in the crystal. Interestingly, we find by k-point sampling as well as by tuning trapped frequency that such a conical dispersion has an inherent light confining property and it is governed by neither of the known wave confining mechanisms like total internal reflection, band gap guidance. Our study reveals that such a conical dispersion in a non-vanishing photonic density of states induces unexpected intense trapping of light compared with those at other points in the continuum. Such studies provoke fabrication of new devices with exciting properties and new functionalities.

关键词: band structure, photonic band gap materials, multilayers, superlattices, photonic structures, metamaterials

Abstract: Existence of out-of-plane conical dispersion for a triangular photonic crystal lattice is reported. It is observed that conical dispersion is maintained for a number of out-of-plane wave vectors (kz). We study a case where Dirac like linear dispersion exists but the photonic density of states is not vanishing, called Dwarf Dirac cone (DDC) which does not support localized modes. We demonstrate the trapping of such modes by introducing defects in the crystal. Interestingly, we find by k-point sampling as well as by tuning trapped frequency that such a conical dispersion has an inherent light confining property and it is governed by neither of the known wave confining mechanisms like total internal reflection, band gap guidance. Our study reveals that such a conical dispersion in a non-vanishing photonic density of states induces unexpected intense trapping of light compared with those at other points in the continuum. Such studies provoke fabrication of new devices with exciting properties and new functionalities.

Key words: band structure, photonic band gap materials, multilayers, superlattices, photonic structures, metamaterials

中图分类号:  (Electron density of states and band structure of crystalline solids)

  • 71.20.-b
42.70.Qs (Photonic bandgap materials) 78.67.Pt (Multilayers; superlattices; photonic structures; metamaterials)