Proceedings of nanoGe Fall Meeting 2018 (NFM18)
DOI: https://doi.org/10.29363/nanoge.nfm.2018.058
Publication date: 6th July 2018
Controlling the flow of light at length scales below the diffraction limit is the quest of nanophotonics. The experimental mapping of electromagnetic modes could provide fundamental insights into nanophotonic systems and facilitate their rational design.
We propose NaYF4 nanocrystals doped with Eu3+ ions as nanoscopic probes for electromagnetic modes at optical frequencies. Eu3+ ions feature several electronic transitions throughout the visible spectrum with electric- or magnetic-dipole character. This enables the nanoprobes to sense both the electric and magnetic components of optical modes at the probes’ location. We verify our concept by mapping the photonic modes close to a metallic mirror. Further, we adapt the method to study surface plasmon polaritons (SPPs), electromagnetic modes confined to metal–dielectric interfaces. By placing the nanoprobes locally at varying distances from a plasmonic reflector, we study plasmonic modes with a resolution well beyond the diffraction limit of light. Our results highlight how a well-designed plasmonic environment can be utilized to control the emission directionality of SPP sources and to selectively enhance electric-dipole-forbidden optical transitions of quantum emitters.
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