Excitation of Dipole Forbidden Transitions in Quantum Mechanical Systems via Optical Nanoantennas

Details Excitation of Dipole Forbidden Transitions in Quantum Mechanical Systems via Optical Nanoantennas Excitation of Dipole Forbidden Transitions in Quantum Mechanical Systems via Optical Nanoantennas

2011-10-18

arxiv.org/abs/1110.3927v1

Physics

Optics

Scientific paper

We suggest to excite dipole-forbidden transitions in quantum-mechanical systems by using appropriately designed optical nanoantennas. The antennas are required to be tailored such that their near-field contains sufficiently strong contributions of higher-order multipole fields. They have to exceed their free space analogs by several orders of magnitude. The concept is verified by exemplarily considering a three-level system. It decays upon excitation by an electric quadrupole transition via two electric dipole transitions into its ground state. Because one dipole transition is assumed to be radiative, the enhancement of this emission may serve as a measure for the efficiency of the process. The suggested scheme may represent a blueprint for future experiments and introduce a novel field of plasmonics research.

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