Selection and Visualization of Degenerate Magnetic and Electric Multipoles up to Radial Higher Orders by Cathodoluminescence
- Taeko MatsukataTaeko MatsukataSchool of Materials and Chemical Technologies, Tokyo Institute of Technology, 4259 Nagatsuta Midoriku, Yokohama 226-8503, JapanRIKEN Cluster for Pioneering Research, 2-1 Hirosawa, Wako, Saitama 351-0198, JapanMore by Taeko Matsukata,
- Nikolaos MatthaiakakisNikolaos MatthaiakakisTheoretical and Physical Chemistry Institute, National Hellenic Research Foundation, Athens 116 35, GreeceMore by Nikolaos Matthaiakakis,
- Taka-aki YanoTaka-aki YanoSchool of Materials and Chemical Technologies, Tokyo Institute of Technology, 4259 Nagatsuta Midoriku, Yokohama 226-8503, JapanRIKEN Cluster for Pioneering Research, 2-1 Hirosawa, Wako, Saitama 351-0198, JapanInstitute of Post-LED Photonics, Tokushima University, Minami-Jyosanjima, Tokushima 770-8506, JapanMore by Taka-aki Yano,
- Masaki HadaMasaki HadaTsukuba Research Center for Interdisciplinary Materials Science (TREMS), Faculty of Pure and Applied Sciences, University of Tsukuba, 1-1-1 Tennodai, Tsukuba, Ibaraki 305-8573, JapanMore by Masaki Hada,
- Takuo TanakaTakuo TanakaRIKEN Cluster for Pioneering Research, 2-1 Hirosawa, Wako, Saitama 351-0198, JapanInstitute of Post-LED Photonics, Tokushima University, Minami-Jyosanjima, Tokushima 770-8506, JapanRIKEN Center for Advanced Photonics, 2-1 Hirosawa, Wako, Saitama 351-0198, JapanMore by Takuo Tanaka,
- Naoki YamamotoNaoki YamamotoSchool of Materials and Chemical Technologies, Tokyo Institute of Technology, 4259 Nagatsuta Midoriku, Yokohama 226-8503, JapanMore by Naoki Yamamoto, and
- Takumi Sannomiya*Takumi Sannomiya*E-mail: [email protected]School of Materials and Chemical Technologies, Tokyo Institute of Technology, 4259 Nagatsuta Midoriku, Yokohama 226-8503, JapanJST PRESTO, 4259 Nagatsuta Midoriku, Yokohama 226-8503, JapanMore by Takumi Sannomiya
Abstract
Interference of electromagnetic multipoles can result in strong directionality of the electromagnetic waves from a single-object antenna, which is essential to realize directional optical nanoantennas below the wavelength of light. Beaming even from a spherically symmetric nanoantenna can be achieved when magnetic modes are utilized in dielectric antennas. More tuning parameters become available by including modes with multiple nodes in the radial direction inside the structure, which we call “radial higher order modes”. To date, the resultant optical field of such radial higher order and magnetic modes had not been experimentally accessible, as the electric displacement field is enclosed inside the structure. The higher degree of degeneracy of the higher order modes also makes the selective observation difficult. In this study, we visualize the internal field of selected degenerate electric and magnetic modes including the radial higher order modes for the first time, using an angle- and polarization-resolved cathodoluminescence based on scanning transmission electron microscopy. Strong radiation directionality due to the interference of eigenmodes is also obtained from spherical nanospheres, which flips drastically by phase change at the resonance.
Cited By
This article is cited by 3 publications.
- Taeko Matsukata, F. Javier García de Abajo, Takumi Sannomiya. Chiral Light Emission from a Sphere Revealed by Nanoscale Relative-Phase Mapping. ACS Nano 2020, Article ASAP.
- Nikolaos Matthaiakakis, Takumi Sannomiya. Boundary Element Method Simulations of Tunable Chiral Radiation and Active Chirality Switching from Rectangular Graphene Nanosheets: Implications for Dynamic Control of Light Chirality. ACS Applied Nano Materials 2020, 3 (7) , 6816-6826. https://doi.org/10.1021/acsanm.0c01202
- Hiroshi Sugimoto, Takuma Okazaki, Minoru Fujii. Mie Resonator Color Inks of Monodispersed and Perfectly Spherical Crystalline Silicon Nanoparticles. Advanced Optical Materials 2020, 8 (12) , 2000033. https://doi.org/10.1002/adom.202000033