Broadband super-collimation with low-symmetric photonic crystal

Giden I. H., Turduev M., Kurt H.

Photonics and Nanostructures - Fundamentals and Applications, vol.11, no.2, pp.132-138, 2013 (SCI-Expanded) identifier identifier

  • Publication Type: Article / Article
  • Volume: 11 Issue: 2
  • Publication Date: 2013
  • Doi Number: 10.1016/j.photonics.2012.12.001
  • Journal Name: Photonics and Nanostructures - Fundamentals and Applications
  • Journal Indexes: Science Citation Index Expanded (SCI-EXPANDED), Scopus
  • Page Numbers: pp.132-138
  • Keywords: Nanophotonic and photonic crystals, Self collimation, Integrated optics, Equifrequency surface, Super collimation, Diffraction
  • TED University Affiliated: No

Abstract

We investigate dispersive properties of two dimensional photonic crystal (PC) called star-shaped PC (STAR-PC) in order to succeed super-collimation over a broad bandwidth. Both time- and frequency-domain numerical methods are conducted. Due to introduced low-symmetry in the primitive cell, flat contours are observed at the fifth band for transverse magnetic mode. The proposed structure supports a super-collimation effect over a broad wavelength range between 1443 nm and 1701 nm with a bandwidth of Δω = 16.42%. The intrinsic characteristic of STAR-PC provides in-plane beam propagation with a limited diffraction length of 120a, where a is the lattice constant. By means of STAR-PC, one may realize super-collimation based single-mode optical devices with a low insertion loss, reduced dispersion and wide bandwidth. © 2012 Elsevier B.V.