The University of Southampton
University of Southampton Institutional Repository

Dispersion, tunability and applications of defect modes in photonic band-gap structures

Pechstedt, R.D., Russell, P.St.J. and Birks, T.A. (1995) Dispersion, tunability and applications of defect modes in photonic band-gap structures At NATO Advanced Study Institutes on Photonic Band Gap Materials, Greece. 18 - 30 Jun 1995.

Record type: Conference or Workshop Item (Paper)


Electronic surface states, whose energies lie within the semiconductor band-gap, are normally regarded as a nuisance to be avoided in semiconductor lasers. This is particularly true of micro-pillar laser arrays where the surface-area-to-volume ratio is large. Similarly, intra-photonic-band-gap interface or surface states will reduce the effectiveness of a photonic bandgap material by introducing intra-band-gap states into which unwanted spontaneous emission and lasing can occur. These are not, however, always undesirable. Examples include: i) the DFB laser mode supported by a structural defect at the centre of a uniform Bragg mirror - the resonant frequency of this mode lies within the photonic bandgap of the Bragg mirror; ii) the surface-guided Bloch modes (SGBM) confined at the surface of multilayer stacks; and iii) Bragg waveguide modes (BWGM) in which total internal reflection is replaced by Bragg reflection between two multilayer stacks. A general feature of defect modes is a phase velocity that is highly sensitive both to optical frequency and to the "strength" of the local aperiodicity that defines the defect. Small compositional and structural changes can radically alter the position of the mode within the stop-band, providing an effective tuning mechanism. Owing to these and other unique properties, defect modes may provide the basis for the development of a versatile new family of optoelectronic devices. In this paper we discuss some properties of SGBM's within the context of photonic bandgaps and show how they can be used to realize a tunable narrow-band fibre tap and a mode-selective fibre coupler

Full text not available from this repository.

More information

Published date: 1995
Venue - Dates: NATO Advanced Study Institutes on Photonic Band Gap Materials, Greece, 1995-06-18 - 1995-06-30


Local EPrints ID: 76970
PURE UUID: c810328f-a61f-4ef9-b808-d8f4ff3dc4cf

Catalogue record

Date deposited: 11 Mar 2010
Last modified: 18 Jul 2017 23:35

Export record


Author: R.D. Pechstedt
Author: P.St.J. Russell
Author: T.A. Birks

University divisions

Download statistics

Downloads from ePrints over the past year. Other digital versions may also be available to download e.g. from the publisher's website.

View more statistics

Atom RSS 1.0 RSS 2.0

Contact ePrints Soton:

ePrints Soton supports OAI 2.0 with a base URL of

This repository has been built using EPrints software, developed at the University of Southampton, but available to everyone to use.

We use cookies to ensure that we give you the best experience on our website. If you continue without changing your settings, we will assume that you are happy to receive cookies on the University of Southampton website.