Publications
ResearcherID : C-5956-2008 (TY, h-index: 25) , AAZ-8749-2021 (RK, h-index: 14)
Google Scholar : TY (h-index: 35), RK (h-index: 16), KT (h-index: 5)
Research Square: TY
2026
Ryota Katsumi Kosuke Takada, Shusuke Akagi
Chiral microwave metasurface for controlling spins in diamond Journal Article
In: npj Nanophotonics , vol. 3, pp. 44, 2026.
Abstract | Links | BibTeX | タグ: chiral, Diamond, microwave
@article{chiral,
title = {Chiral microwave metasurface for controlling spins in diamond},
author = {Kosuke Takada, Ryota Katsumi, Shusuke Akagi, Kazunobu Hashimoto, Takashi Yatsui},
doi = {10.1038/s44310-026-00138-0},
year = {2026},
date = {2026-05-29},
urldate = {2026-05-29},
journal = {npj Nanophotonics },
volume = {3},
pages = {44},
abstract = {Nitrogen-vacancy (NV) centers in diamond are versatile platforms for quantum technologies, for which engineering microwave magnetic-field confinement and polarization are key elements. However, current microwave devices lack the capability to flexibly manipulate both. In this study, we address this issue by investigating a spoof surface plasmon polariton (SSPP)-based metasurface for engineering strongly confined microwave magnetic fields. Within the propagating SSPP mode, we reveal a rich texture of three-dimensionally oriented polarization, including circular polarization. In addition, we demonstrate the generation of a circularly polarized microwave magnetic field for an NV-containing diamond nanostructure, evidenced by spin-resonance spectra probed via the SSPP. We further confirm the non-reciprocal behavior of spin excitation due to the magnetic spin-momentum locking of propagating SSPPs. Furthermore, the circularly polarized field can be engineered to align with NV axes, enabling spin- and axis-selective control. This architecture could potentially enable on-chip zero-field vector magnetometry, overcoming a significant hurdle in compact quantum device integration.},
keywords = {chiral, Diamond, microwave},
pubstate = {published},
tppubtype = {article}
}
Nitrogen-vacancy (NV) centers in diamond are versatile platforms for quantum technologies, for which engineering microwave magnetic-field confinement and polarization are key elements. However, current microwave devices lack the capability to flexibly manipulate both. In this study, we address this issue by investigating a spoof surface plasmon polariton (SSPP)-based metasurface for engineering strongly confined microwave magnetic fields. Within the propagating SSPP mode, we reveal a rich texture of three-dimensionally oriented polarization, including circular polarization. In addition, we demonstrate the generation of a circularly polarized microwave magnetic field for an NV-containing diamond nanostructure, evidenced by spin-resonance spectra probed via the SSPP. We further confirm the non-reciprocal behavior of spin excitation due to the magnetic spin-momentum locking of propagating SSPPs. Furthermore, the circularly polarized field can be engineered to align with NV axes, enabling spin- and axis-selective control. This architecture could potentially enable on-chip zero-field vector magnetometry, overcoming a significant hurdle in compact quantum device integration.