Simultaneous near field imaging of electric and magnetic field in photonic crystal nanocavities |
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| Authors: | Silvia Vignolini Francesca Intonti Francesco Riboli Diederik Sybolt Wiersma Laurent Balet Lianhe H Li Marco Francardi Annamaria Gerardino Andrea Fiore Massimo Gurioli |
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| Institution: | 1. European Laboratory for Non-linear Spectroscopy and CNR-INO, Via Nello Carrara 1, 50019 Sesto Fiorentino, Italy;2. Ecole Polytechnique Fédérale de Lausanne, Institute of Photonics and Quantum Electronics, Station 3, CH-1015 Lausanne, Switzerland;3. Institute of Photonics and Nanotechnology, CNR, via del Cineto Romano 42, 00156 Roma, Italy;4. COBRA Research Institute, Eindhoven University of Technology, 5600 MB Eindhoven, The Netherlands;5. European Laboratory for Non-linear Spectroscopy, CNISM and Department of Physics, University of Florence, Via Nello Carrara 1, 50019 Sesto Fiorentino, Italy |
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| Abstract: | The insertion of a metal-coated tip on the surface of a photonic crystal microcavity is used for simultaneous near field imaging of electric and magnetic fields in photonic crystal nanocavities, via the radiative emission of embedded semiconductor quantum dots (QD). The photoluminescence intensity map directly gives the electric field distribution, to which the electric dipole of the QD is coupled. The magnetic field generates, via Faraday's law, a circular current in the apex of the metallized probe that can be schematized as a ring. The resulting magnetic perturbation of the photonic modes induces a blue shift, which can be used to map the magnetic field, within a single near-field scan. |
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