Multiply coated microspheres. A platform for realizing fields-induced
structural transition and photonic bandgap
Ping Sheng*, Weijia Wen, Ning Wang, Hongru Ma, Zhifang Lin, W. Y.
Zhang, X. Y. Lei, Z. L. Wang, D. G. Zheng, Wing Yim Tam, and C. T. Chan
*Department of Physics, Hong Kong University of Science
and Technology, Clear Water Bay, Kowloon, Hong Kong, China
Abstract: Under crossed electric and magnetic fields, multiply
coated microspheres form columnar crystallites with an internal structure
that transforms from body-centered-tetragonal to face-centered-cubic
as the ratio between the magnetic and the electric fields exceeds a
minimum value. The observed transition scenario is in excellent agreement
with calculations. These multiply coated microspheres also serve as
building blocks for photonic crystals. Robust photonic gaps exist in
any periodic structure built from such spheres when the filling ratio
of the spheres exceeds a threshold.
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