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Issue 38, 2013
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Electric field tuning of magnetically assembled photonic crystals

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Electrically tunable photonic crystals are fabricated by encapsulating magnetically assembled colloidal crystals inside an electrolytic cell, and their reflection decreases or recovers when an electric field is applied or removed. The reflection changes are caused by the change in the order degree of the colloidal crystals, which can be further explained by the migration of Fe3O4 nanoparticles and the change of localized ionic strength in different electric fields. A stronger electric field is needed to tune the colloidal crystals assembled by a strong magnetic field, and a good match between their strengths is significant to improve the sensitivity and reversibility of the reflection switching. Generally, the reflection falls within 1 s and recovers after 4–5 s depending on the field strength. Since the electric field can be well restricted in the space between two electrodes and precisely controlled by the applied potentials, it is possible to fabricate adjacent magnetic photonic crystal cells whose reflection signals can be independently controlled by the electric field, which reveals a possible solution to high-resolution photonic crystal based optical devices.

Graphical abstract: Electric field tuning of magnetically assembled photonic crystals

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Article information

04 Mar 2013
08 Apr 2013
First published
09 Apr 2013

J. Mater. Chem. C, 2013,1, 6129-6135
Article type

Electric field tuning of magnetically assembled photonic crystals

J. Liu, Y. Mao and J. Ge, J. Mater. Chem. C, 2013, 1, 6129
DOI: 10.1039/C3TC30399C

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