Mapping Magnetic Near-Field Distributions of Plasmonic Nanoantennas
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- 作者：Denitza Denkova ; Niels Verellen ; Alejandro V. Silhanek ; Ventsislav K. Valev ; Pol Van Dorpe ; Victor V. Moshchalkov
- 刊名：ACS Nano
- 出版年：2013
- 出版时间：April 23, 2013
- 年：2013
- 卷：7
- 期：4
- 页码：3168-3176
- 全文大小：1631K
- 年卷期：v.7,no.4(April 23, 2013)
- ISSN：1936-086X
文摘
We present direct experimental mapping of the lateral magnetic near-field distribution in plasmonic nanoantennas using aperture scanning near-field optical microscopy (SNOM). By means of full-field simulations it is demonstrated how the coupling of the hollow-pyramid aperture probe to the nanoantenna induces an effective magnetic dipole which efficiently excites surface plasmon resonances only at lateral magnetic field maxima. This excitation in turn affects the detected light intensity enabling the visualization of the lateral magnetic near-field distribution of multiple odd and even order plasmon modes with subwavelength spatial resolution.