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Enhanced Coupling to Slow Photon Modes in Three‐Dimensional Graded Colloidal Photonic Crystals
Author(s) -
von Freymann G.,
John S.,
Kitaev V.,
Ozin G. A.
Publication year - 2005
Publication title -
advanced materials
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 10.707
H-Index - 527
eISSN - 1521-4095
pISSN - 0935-9648
DOI - 10.1002/adma.200402082
Subject(s) - materials science , photonic crystal , polystyrene , colloid , etching (microfabrication) , coupling (piping) , photonics , colloidal crystal , plasma etching , gradation , optoelectronics , optics , spectral line , polymer , nanotechnology , composite material , layer (electronics) , chemistry , astronomy , computer science , computer vision , physics
Enhanced coupling to slow photon modes at the band‐edge of graded three‐dimensional, thin‐film polymer colloidal photonic crystals (see Figure) is demonstrated. For the gradation, polystyrene latex is etched by exposure to air plasma, yielding a top‐to‐bottom filling‐fraction gradient. By monitoring transmission and corresponding phase spectra upon etching, spectral blue‐shifts and enhanced mode coupling are observed. Also, surface roughness is reduced, resulting in higher structural and optical quality colloidal photonic crystals.