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Magnetic Assembly and Field‐Tuning of Ellipsoidal‐Nanoparticle‐Based Colloidal Photonic Crystals
Author(s) -
Wang Mingsheng,
He Le,
Xu Wenjing,
Wang Xin,
Yin Yadong
Publication year - 2015
Publication title -
angewandte chemie
Language(s) - English
Resource type - Journals
eISSN - 1521-3757
pISSN - 0044-8249
DOI - 10.1002/ange.201501782
Subject(s) - photonics , wavelength , photonic crystal , materials science , perpendicular , diffraction , anisotropy , magnetic field , nanophotonics , field (mathematics) , optics , nanostructure , ray , nanoparticle , optoelectronics , nanotechnology , physics , geometry , mathematics , quantum mechanics , pure mathematics
Anisotropic nanostructures provide an additional degree of freedom for tailoring the collective properties of their ensembles. Using Fe@SiO 2 nanoellipsoids as anisotropic building blocks, herein we demonstrate a new class of magnetically responsive photonic structures whose photonic properties can be dynamically tuned by controlling the direction of the magnetic fields they are exposed to. These novel photonic structures diffract at a minimum wavelength when the field direction is perpendicular to the incident angle, and a maximum wavelength when the field is switched to parallel direction; and the diffraction intensity reaches maximum values when the fields are either parallel or perpendicular to the incident light, and decreases when the field direction is moved off‐angle.