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Finite-size limitations on quality factor of guided resonance modes in 2D photonic crystals

Abstract

High-Q guided resonance modes in two-dimensional photonic crystals, enable high field intensity in small volumes that can be exploited to realize high performance sensors. We show through simulations and experiments how the Q-factor of guided resonance modes varies with the size of the photonic crystal, and that this variation is due to loss caused by scattering of in-plane propagating modes at the lattice boundary and coupling of incident light to fully guided modes that exist in the homogeneous slab outside the lattice boundary. A photonic crystal with reflecting boundaries, realized by Bragg mirrors with a band gap for in-plane propagating modes, has been designed to suppress these edge effects. The new design represents a way around the fundamental limitation on Q-factors for guided resonances in finite photonic crystals. Results are presented for both simulated and fabricated structures.

Category

Academic article

Language

English

Author(s)

  • Jon Olav Grepstad
  • Martin Møller Greve
  • Bodil Holst
  • Ib-Rune Johansen
  • Olav Solgaard
  • Aasmund Sudbø

Affiliation

  • Norwegian University of Science and Technology
  • University of Bergen
  • SINTEF Digital / Microsystems and Nanotechnology
  • Stanford University
  • University of Oslo

Year

2013

Published in

Optics Express

ISSN

1094-4087

Publisher

Optical Society of America

Volume

21

Issue

20

Page(s)

23640 - 23654

View this publication at Cristin