94 citations · 598 across the 19 of their papers we have counts for
19 papers
Hidden Symmetry Protection and Topology in Surface Maxwell Waves
Yosuke Nakata, Toshihiro Nakanishi, Ryo Takahashi +2
Since the latter half of the 20th century, the use of metal in optics has become a promising plasmonics field for controlling light at a deep subwavelength scale. Surface plasmon p…
Dynamic quarter-wave metasurface for efficient helicity inversion of polarization beyond the single-layer conversion limit
Mitsuki Kobachi, Fumiaki Miyamaru, Toshihiro Nakanishi +3
Terahertz chiral sensing and polarization-multiplexing communication demand subwavelength devices that dynamically invert polarization helicity. Metasurfaces can enhance anisotropy…
Broadband operation of active terahertz quarter-wave plate achieved with vanadium-dioxide-based metasurface switchable by current injection
Toshihiro Nakanishi, Yosuke Nakata, Yoshiro Urade +1
We demonstrate the broadband operation of a switchable terahertz quarter-wave plate achieved with an active metasurface employing vanadium dioxide. For this purpose, we utilize ani…
Optical heterodyne imaging of magnetostatic modes in one-dimensional magnonic crystals
Shotaro Z. Baba, Yosuke Nakata, Yoshitaka Ito +3
We demonstrate a real-space imaging of a heterodyne signal of light that is produced as a result of the Brillouin light scattering by coherently driven magnons in magnetostatic mod…
Helicity-Changing Brillouin Light Scattering by Magnons in a Ferromagnetic Crystal
R. Hisatomi, A. Noguchi, R. Yamazaki +4
Brillouin light scattering in ferromagnetic materials usually involves one magnon and two photons and their total angular momentum is conserved. Here, we experimentally demonstrate…
Topological Boundary Modes from Translational Deformations
Yosuke Nakata, Yoshitaka Ito, Yasunobu Nakamura +1
Localized states universally appear when a periodic potential is perturbed by defects or terminated at its surface. In this Letter, we theoretically and experimentally demonstrate…
Resonant magnetic induction tomography of a magnetized sphere
Arnaud Gloppe, Ryusuke Hisatomi, Yosuke Nakata +2
We demonstrate the structural imaging of magnetostatic spin-wave modes hosted in a millimeter-sized ferromagnetic sphere. Unlike for low-dimensional magnetic materials, there is no…
Reconfigurable terahertz quarter-wave plate for helicity switching based on Babinet inversion of anisotropic checkerboard metasurface
Yosuke Nakata, Kai Fukawa, Toshihiro Nakanishi +3
Dynamic helicity switching by utilizing metasurfaces is challenging because it requires deep modulation of polarization states. To realize such helicity switching, this paper propo…
Energy loss of terahertz electromagnetic waves by nano-sized connections in near-self-complementary metallic checkerboard patterns
Keisuke Takano, Yoku Tanaka, Gabriel Moreno +9
The design of a self-complementary metallic checkerboard pattern achieves broadband, dispersion-less, and maximized absorption, concentrating in the deep subwavelength resistive co…
Freestanding transparent terahertz half-wave plate using subwavelength cut-wire pairs
Yosuke Nakata, Yudai Taira, Toshihiro Nakanishi +1
We designed a cut-wire-pair metasurface that works as a transparent terahertz half-wave plate, by matching the electric and magnetic resonances of the structure. Due to the impedan…
Observation of Fano resonance using a coupled resonator metamaterial composed of meta-atoms arranged by double periodicity
Tsubasa Nishida, Yosuke Nakata, Fumiaki Miyamaru +2
We studied the transmission characteristics of a planar metamaterial consisting of an array of electric split-ring resonators (eSRRs) with double periodicity. Because of coupling b…
Anisotropic Babinet-invertible metasurfaces to realize transmission-reflection switching for orthogonal polarizations of light
Yosuke Nakata, Yoshiro Urade, Kunio Okimura +4
The electromagnetic properties of an extremely thin metallic checkerboard drastically change from resonant reflection (transmission) to resonant transmission (reflection) when the…
Broadband and energy-concentrating terahertz coherent perfect absorber based on a self-complementary metasurface
Yoshiro Urade, Yosuke Nakata, Toshihiro Nakanishi +1
We demonstrate that a self-complementary checkerboard-like metasurface works as a broadband coherent perfect absorber (CPA) when symmetrically illuminated by two counter-propagatin…
Supersymmetric correspondence in spectra on a graph and its line graph: From circuit theory to spoof plasmons on metallic lattices
Yosuke Nakata, Yoshiro Urade, Toshihiro Nakanishi +3
We investigate the supersymmetry (SUSY) structures for inductor-capacitor circuit networks on a simple regular graph and its line graph. We show that their eigenspectra must coinci…
Observation of a nonradiative flat band for spoof surface plasmons in a metallic Lieb lattice
Sho Kajiwara, Yoshiro Urade, Yosuke Nakata +2
We demonstrate a nonradiative flat band for spoof surface plasmon polaritons bounded on a structured surface with Lieb lattice symmetry in the terahertz regime. First, we theoretic…
Dynamically Babinet-invertible metasurface: a capacitive-inductive reconfigurable filter for terahertz waves using vanadium-dioxide metal-insulator transition
Yoshiro Urade, Yosuke Nakata, Kunio Okimura +4
This paper proposes a reconfigurable planar metamaterial that can be switched between capacitive and inductive responses using local changes in the electrical conductivity of its c…
Frequency-Independent Response of Self-Complementary Checkerboard Screens
Yoshiro Urade, Yosuke Nakata, Toshihiro Nakanishi +1
This research resolves a long-standing problem on the electromagnetic response of self-complementary metallic screens with checkerboardlike geometry. Although Babinet's principle i…
Plane-wave scattering by self-complementary metasurfaces in terms of electromagnetic duality and Babinet's principle
Yosuke Nakata, Yoshiro Urade, Toshihiro Nakanishi +1
We investigate theoretically electromagnetic plane-wave scattering by self-complementary metasurfaces. By using Babinet's principle extended to metasurfaces with resistive elements…
Observation of flat band for terahertz spoof plasmon in metallic kagomé lattice
Yosuke Nakata, Takanori Okada, Toshihiro Nakanishi +1
We study the dispersion relation of a metamaterial composed of metallic disks and bars arranged to have kagome symmetry and find that a plasmonic flat band is formed by the topolog…