Low-contrast bandgaps of a planar parabolic spiral lattice
Low-contrast bandgaps of a planar parabolic spiral lattice
We show that a planar aperiodic lattice, mimicking the appearance of a sunflower, supports photonic bandgaps for weak dielectric contrast. The pattern’s high orientational order and spatially uniform modal pitch yields an isotropic Fourier space. A 2D structure of cylinders (ε=2) in air possesses a wide 21% TM bandgap, versus 5.6% for a sixfold lattice or 14% for a 12-fold fractal tiling. The isotropic gap frequencies imply flat bands, and thus application in nonlinear optics and low threshold lasers, where a reduced group velocity in all directions may be desired.
2805-2807
Pollard, M.E.
c439d195-6e7c-48d7-ab81-a20c72b72632
Parker, G.J.
edf88b88-ba05-48a5-8ae4-d6d6aa984364
10 September 2009
Pollard, M.E.
c439d195-6e7c-48d7-ab81-a20c72b72632
Parker, G.J.
edf88b88-ba05-48a5-8ae4-d6d6aa984364
Pollard, M.E. and Parker, G.J.
(2009)
Low-contrast bandgaps of a planar parabolic spiral lattice.
Optics Letters, 34 (18), .
(doi:10.1364/OL.34.002805).
Abstract
We show that a planar aperiodic lattice, mimicking the appearance of a sunflower, supports photonic bandgaps for weak dielectric contrast. The pattern’s high orientational order and spatially uniform modal pitch yields an isotropic Fourier space. A 2D structure of cylinders (ε=2) in air possesses a wide 21% TM bandgap, versus 5.6% for a sixfold lattice or 14% for a 12-fold fractal tiling. The isotropic gap frequencies imply flat bands, and thus application in nonlinear optics and low threshold lasers, where a reduced group velocity in all directions may be desired.
Text
Pollard2009
- Version of Record
Restricted to Repository staff only
Request a copy
More information
Published date: 10 September 2009
Organisations:
Nanoelectronics and Nanotechnology
Identifiers
Local EPrints ID: 268605
URI: http://eprints.soton.ac.uk/id/eprint/268605
ISSN: 0146-9592
PURE UUID: e6123b4c-1863-48fd-9f07-2f4d1f6e0ec6
Catalogue record
Date deposited: 12 Mar 2010 20:31
Last modified: 14 Mar 2024 09:14
Export record
Altmetrics
Contributors
Author:
M.E. Pollard
Author:
G.J. Parker
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