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Experimental and theoretical investigation of optical properties of colloidal photonic crystal films

C. FARCĂU1,2, E.VINŢELER1,* , S. AŞTILEAN2,1

Affiliation

  1. Faculty of Physics, Babeş-Bolyai University, Str M. Kogalniceanu 1, 400084 Cluj-Napoca, Romania
  2. Nanobiophotonics Laboratory, Institute for Interdisciplinar Experimental Research, Babes-Bolyai University, T. Laurian 42, 400271, Cluj-Napoca, Romania

Abstract

We studied the experimental and calculated transmission and reflectivity spectra of a monolayer and a bilayer of periodic array of polystyrene spheres (triangular lattice) on finite glass substrate at normal incidence. We also investigated the nearfield intensity |Ex|2 at different relevant wavelengths for a sampling plane that crosses the monolayer of spheres at equator. We find that transmission and reflectivity minima are related to near-field coupling between neighbouring spheres, forming waveguide photonic modes of the array..

Keywords

Colloidal photonic crystals, Finite-difference time-domain.

Submitted at: Oct. 30, 2008
Accepted at: Dec. 10, 2008

Citation

C. FARCĂU, E.VINŢELER, S. AŞTILEAN, Experimental and theoretical investigation of optical properties of colloidal photonic crystal films, Journal of Optoelectronics and Advanced Materials Vol. 10, Iss. 12, pp. 3165-3168 (2008)