Kihm Hyun Woo, Kim Jineun, Koo Sukmo, Ahn Jaesung, Ahn Kwangjun, Lee Kwanggeol, Park Namkyoo, Kim Dai-Sik
Center for Subwavelength Optics and Department of Physics and Astronomy, Seoul National University, Seoul 151-747, Korea.
Opt Express. 2013 Mar 11;21(5):5625-33. doi: 10.1364/OE.21.005625.
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.
光磁场的局部分布是开发具有人工设计光学特性材料的关键参数。由于物质与光磁场的相互作用较弱，纳米尺度下的光磁场表征仍然是一个挑战。在此，我们通过在金属薄膜或锥形探针中光栅扫描圆形孔径，展示了光磁场分布的实验可视化。通过测量透过金属孔径的透射率，表面等离激元极化激元和径向偏振光束的光磁场得以可视化，与理论预测高度吻合。我们的结果表明，贝塞尔 - 鲍坎普孔径可用于光磁场分布的可视化。
