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Magnetically Controlled Assembly of Dielectric Microspheres toward Photonic Molecules
Author(s) -
Yin Baipeng,
Wu Wubin,
Dai Chenghu,
Jia Hao,
Zhang Chuang,
Yao Jiannian
Publication year - 2021
Publication title -
advanced functional materials
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 6.069
H-Index - 322
eISSN - 1616-3028
pISSN - 1616-301X
DOI - 10.1002/adfm.202103945
Subject(s) - materials science , photonics , diamagnetism , fabrication , optoelectronics , nanophotonics , photonic crystal , nanotechnology , dielectric , plasmon , magnetic field , physics , medicine , alternative medicine , pathology , quantum mechanics
The construction of “photonic molecules” with controlled sizes and shapes is of particular interest for the integration of miniaturized devices into optoelectronic chips. Here, a general approach is reported that allows the assembly of colloidal microspheres into coupled microcavities with high yield and large scale, utilizing magnetostatic interactions between diamagnetic building blocks dispersed in a ferrofluid under an external field. By precisely designing the local field gradient around diamagnetic microspheres, “virtual templates” can be formed to produce various coupled photonic structures, including diatomic heterogeneous molecules and polyatomic chain molecules. The diatomic structures can modulate the optical resonance modes upon the coherent coupling between microsphere cavities and serve as single‐mode wavelength‐tunable microlasers. The chain photonic molecules, as coupled resonator optical waveguides, could modulate the light propagation and store photons up to tens of picoseconds. The magnetically controlled assembly method is demonstrated, which provides a promising way for the facile and efficient fabrication of coupled microstructures for fascinating photonic and optoelectronic applications.