Berlin 2015 – wissenschaftliches Programm

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O: Fachverband Oberflächenphysik

O 52: Focus Session: Nanophotonic Concepts and Materials for Energy Harvesting - Plasmonics, Transformation Optics, Upconversion, and beyond

O 52.3: Vortrag

Mittwoch, 18. März 2015, 12:00–12:15, EW 201

Emission quenching of magnetic dipole transitions near an absorbing optical nanoantenna — •Dmitry Chigrin, Deepu Kumar, and Gero von Plessen — RWTH Aachen University, 52074 Aachen, Germany

The optical emission of an ionic emitter near an absorbing optical nanoantenna (such as a metal nanoparticle) can be enhanced or quenched due to near-field effects induced by the nanoantenna. A comparison of emission quenching of electric dipole (ED) and magnetic dipole (MD) transitions in the close vicinity of a metal nanoparticle has been carried out in this work. It is demonstrated that the emission quenching of the MD transitions becomes dominant at substantially shorter distances to the surface of the absorbing nanoantenna as compared to the ED transitions. This difference in quenching behaviour is due to different asymptotic dependencies of the quasi-static radiative and non-radiative decay rates of ED and MD transitions near a metal nanoparticle. It is shown that in the extreme near-field regime the non-locality of the dielectric response of the metal cannot be neglected, which leads to a reduction in the emission quenching for both ED and MD transitions near the absorbing optical nanoantenna.