Tailoring slow light properties by shifting the innermost rows of holes in photonic crystal waveguides with ring-shaped holes

BAĞCI F., AKAOĞLU B.

OPTOELECTRONICS AND ADVANCED MATERIALS-RAPID COMMUNICATIONS, vol.8, no.5-6, pp.353-358, 2014 (SCI-Expanded) identifier identifier

  • Publication Type: Article / Article
  • Volume: 8 Issue: 5-6
  • Publication Date: 2014
  • Journal Name: OPTOELECTRONICS AND ADVANCED MATERIALS-RAPID COMMUNICATIONS
  • Journal Indexes: Science Citation Index Expanded (SCI-EXPANDED), Scopus
  • Page Numbers: pp.353-358
  • Keywords: Photonic crystal waveguide, Slow light, Group index, Plane-wave expansion method, Finite-difference time-domain method, LOW-DISPERSION, NONLINEAR ENHANCEMENT
  • Ankara University Affiliated: Yes

Abstract

A silicon ring-shaped photonic crystal waveguide embedded in silica is proposed and the effects of shifting the first and the second innermost rows towards the line-defect on slow light properties are systematically investigated by plane-wave expansion method. The first and second rows affect the slow light characteristics differently, which offers a strategy to design flatter bands. The behavior of slow light generation in ring-shaped photonic crystal waveguides against row shifting is clarified and a structural strategy for obtaining higher group index and less group velocity dispersion is put forward. Slow wave propagation is also verified by finite-difference time-domain calculations.