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Angle‐Dependent Extinction of Anisotropic Silica/Au Core/Shell Colloids Made via Ion Irradiation
Author(s) -
Penninkhof J. J.,
Graf C.,
van Dillen T.,
Vredenberg A. M.,
van Blaaderen A.,
Polman 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.200401742
Subject(s) - materials science , irradiation , anisotropy , ion , extinction (optical mineralogy) , fluence , deformation (meteorology) , colloid , amorphous solid , ion track , shell (structure) , core (optical fiber) , molecular physics , ion beam , composite material , optics , crystallography , chemical engineering , chemistry , physics , nuclear physics , engineering , quantum mechanics
Spherical colloids with silica cores (300–500 nm diameter) and gold shells (20–60 nm thickness) are shown to deform to form oblate ellipsoids under ion‐beam irradiation, as shown in the Figure. The deformation, which can be controlled by ion fluence, is attributed to an ion‐induced anisotropic deformation in the amorphous silica that is constrained mechanically by the gold shell. The optical extinction of these samples is highly angle‐dependent.