Observation of trapped light induced by Dwarf Dirac-cone in out-of-plane condition for photonic crystals |
| |
| Authors: | Subir Majumder Tushar Biswas Shaymal K Bhadra |
| |
| Affiliation: | Fiber Optics and Photonics Division, CSIR-Central Glass and Ceramic Research Institute, 196, Kolkata 700032, India |
| |
| 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(k_z). 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. |
| |
| Keywords: | band structure photonic band gap materials multilayers superlattices photonic structures metamaterials |
| 本文献已被 CNKI 等数据库收录！ |
| 点击此处可从《中国物理 B》浏览原始摘要信息 |
|
点击此处可从《中国物理 B》下载免费的PDF全文 |
|
