Simultaneous near field imaging of electric and magnetic field in photonic crystal nanocavities

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• 作者：Silvia Vignolini^a ; ^{sv319@cam.ac.uk} ; Francesca Intonti^a ; Francesco Riboli^a ; Diederik Sybolt Wiersma^a ; Laurent Balet^b ; Lianhe H. Li^b ; Marco Francardi^c ; Annamaria Gerardino^c ; Andrea Fiore^d ; Massimo Gurioli^e
• 关键词：Near-field ; Magnetic imaging ; Photonic crystal
• 刊名：Photonics and Nanostructures - Fundamentals and Applications
• 出版年：2012
• 期刊代码：120_15694410
• 类别：ms
• 出版时间：June, 2012
• 卷：10
• 期：3
• 页码：251-255
• 文件大小：510 K

摘要

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.