TITLE

Buckled colloidal crystals with nonspherical bases for two-dimensional slab photonic band gaps

AUTHOR(S)
Riley, E. K.; Fung, E. Y.; Watson, C. M. Liddell
PUB. DATE
May 2012
SOURCE
Journal of Applied Physics;May2012, Vol. 111 Issue 9, p093504
SOURCE TYPE
Academic Journal
DOC. TYPE
Article
ABSTRACT
Theoretical modeling of the photonic band gap forming properties is reported for the buckled phase of anisotropic particles. These exist between the first and second particulate layers of confined colloidal suspensions. Inspired by the range of non-spherical mushroom-cap building blocks for self-assembly that have been synthesized using seeded emulsion-polymerization, we explore in particular the band structures as a function of toroid shape parameter. The parameter is adjusted to incrementally transform hemispheres to spheres. Additionally, corrugation heights that systematically modulate the slab photonic crystal unit cell from rectangular monolayer to square bilayer are investigated. Polarization independent gaps in the guided modes are determined for direct and inverted structures that exhibit bifurcation in the particle orientation perpendicular to the slab plane. Gaps in the guided modes are observed between the fourth and fifth, twelfth and thirteenth, as well as higher band locales as the particle morphology and lattice aspect ratio vary.
ACCESSION #
75231021

 

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