Title：Magneto-plasmonics of Au/Co/Au nanoring based structures by Hole mask colloidal lithography

Invited Speaker：Feng LUO

Room：Chemistry Building A717 Hall

Time：15:30 pm, May 14, 2016

Abstract：Au nanoring structure as a plasmon supporter exhibits a tunable and bimodal resonant behavior in a very wide wavelength range, from visible to infrared.[1] By adding ferromagnetic constituent such as Co, into the plasmonic structures, it is possible either to tune their plasmonic responses by the external magnetic field or to enhance the magneto-optical(MO) activity due to the locally enhanced electromagnetic field by the plasmonic resonance.[2] On the other hand, a novel lithography method, hole mask colloidal lithography, offers us possibilities to fabricate nanostructures in different dimensions and even to tune the constituent of the structures in such an easy fashion. Morphology tuning of a series of Au/Co/Au nanostructures which gradually evolve from disk to ring allows controlling their optical and magneto-optical spectral responses in the visible and near infrared ranges.[3] Bimodal resonant behavior in the optical and MO activity is observed, and by either tuning the morphological parameters, or the distribution of the ferromagnetic constituent, the spectral response of MO activity shows a good tunability and fine control, not only in a wide wavelength range, but also in the relative ratio of the Low-energy and High-energy modes, which has great potential in detailed design for telecommunication and sensor devices.

References

[1] H. Y. Feng, F. Luo, R. Kekesi, D. Granados, D. Meneses-Rodríguez, J. M. García, A. García-Martín, G. Armelles, A. Cebollada, Adv. Optical Mater. 2 (2014) 612.

[2] G. Armelles, A. Cebollada, A. García-Martín, M. U. González, Adv. Optical Mater. 1 (2013) 10.

[3] H. Y. Feng, F. Luo, D. Meneses-Rodríguez, G. Armelles, A. Cebollada, Appl. Phys. Lett. 106, (2015) 083105.