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Plasmonics with a Twist: Taming Optical Tornadoes on the Nanoscale

  • Svetlana V. Boriskina
Chapter
Part of the Challenges and Advances in Computational Chemistry and Physics book series (COCH, volume 15)

Abstract

This chapter discusses a hydrodynamics-inspired approach to trap and manipulate light in plasmonic nanostructures, which is based on steering optical powerflow around nano-obstacles. New insights into plasmonic nanofocusing mechanisms are obtained by invoking an analogy of the ‘photon fluid’ (PF). By proper nanostructure design, PF kinetic energy can be locally increased via convective acceleration and then converted into ‘pressure’ energy to generate localized areas of high field intensity. In particular, trapped light can be molded into optical vortices–tornado-like areas of circular motion of power flux–connected into transmission-like sequences. In the electromagnetic theory terms, this approach is based on radiationless electromagnetic interference of evanescent fields rather than on interference of propagating waves radiated by the dipoles induced in nanoparticles. The resulting ability to manipulate optical powerflow well beyond the diffraction limit helps to reduce dissipative losses, to increase the amount of energy accumulated within a nanoscale volume, and to activate magnetic response in non-magnetic nanostructures. It also forms a basis for long-range on-chip energy transfer/routing as well as for active nanoscale field modulation and switching.

Keywords

Plasmon Optical tornado Light scattering 

Notes

Acknowledgments

I would like to thank Dr. Anton Desyatnikov from Australian National University and my colleagues at Boston University and MIT for useful discussions.

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© Springer Science+Business Media Dordrecht 2013

Authors and Affiliations

  1. 1.Mechanical Engineering DepartmentMassachusetts Institute of TechnologyCambridgeUSA

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