Journal
OPTICS EXPRESS
Volume 21, Issue 5, Pages 5625-5633Publisher
OPTICAL SOC AMER
DOI: 10.1364/OE.21.005625
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Funding
- National Research Foundation of Korea (NRF)
- Korean government (MEST) (SRC) [2008-0062255]
- Korean government (MEST) (GRL) [K20815000003]
- Korean government (MEST) [2010-0029648, 2011-0019170, 2011-0020209]
- Global Frontier R&D Program on Center for Multiscale Energy System [2012M3A6A7054864]
- Hi Seoul Science / Humanities Fellowship from Seoul Scholarship Foundation
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Local distribution of the optical magnetic field is a critical parameter in developing materials with artificially engineered optical properties. Optical magnetic field characterization in nano-scale remains a challenge, because of the weak matter-optical magnetic field interactions. Here, we demonstrate an experimental visualization of the optical magnetic field profiles by raster scanning circular apertures in metal film or in a conical probe. Optical magnetic fields of surface plasmon polaritons and radially polarized beam are visualized by measuring the transmission through metallic apertures, in excellent agreements with theoretical predictions. Our results show that Bethe-Bouwkamp aperture can be used in visualizing optical magnetic field profiles. (C) 2013 Optical Society of America
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