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Candidate Toroidal Electric Dipole Mode in the Spherical Nucleus ^{58}Ni.
Phys Rev Lett
December 2024
Research Center for Nuclear Physics, Osaka University, Ibaraki, Osaka 567-0047, Japan.
Dipole toroidal modes appear in many fields of physics. In nuclei, such a mode was predicted more than 50 years ago, but clear experimental evidence was lacking so far. Using a combination of high-resolution inelastic scattering experiments with photons, electrons, and protons, we identify for the first time candidates for toroidal dipole excitations in the nucleus ^{58}Ni and demonstrate that transverse electron scattering form factors represent a relevant experimental observable to prove their nature.
View Article and Find Full Text PDFPixelated Toroidal Metasurface Sensor with Broadband Terahertz Fingerprint Enhancement for Biochemical Trace Detection.
ACS Appl Mater Interfaces
December 2024
School of Electronic Science and Engineering, Southeast University, Nanjing 210096, China.
Terahertz (THz) trace fingerprint detection is essential for identifying the characteristic biomolecular absorption fingerprints from inherent molecular rotational and vibrational modes. Plasmonic THz resonance shows a way to enhance the recognition of biomolecular absorption fingerprint spectra. In this research, we experimentally demonstrate a broadband THz fingerprint metasensor based on a pixelated toroidal metasurface, showcasing excellent capabilities in biochemical trace detection.
View Article and Find Full Text PDFAsymmetric dumbbell dimers simultaneously supporting quasi-bound states in continuum and anapole modes for terahertz biosensing.
Nanophotonics
September 2024
Institute of Modern Optics, Nankai University, Tianjin, China.
Multi-resonant metasurfaces are of great significance in the applications of multi-band nanophotonics. Here, we propose a novel metasurface design scheme for simultaneously supporting quasi-bound states in continuum (QBIC) and other resonant modes, in which QBIC resonance is generated by mirror or rotational symmetry breaking in oligomers while other resonant modes can be simultaneously excited by rationally designing the shapes of meta-atoms within oligomers. As an example, the simultaneous excitation of QBIC and anapole modes are demonstrated in a dimer metasurface composed of asymmetric dumbbell-shaped apertures.
View Article and Find Full Text PDFArticle Synopsis
- The study introduces a new metastructure made of silicon nanoblock tetramer clusters aimed at enhancing surface sensing capabilities by utilizing polarization-independent properties through bound states in the continuum (BICs).
- Three quasi-BIC modes were identified at specific wavelengths, achieving high sensitivity and quality factors, confirming the effectiveness of the design for precision sensing applications.
- The research utilized advanced simulation methods to explore electromagnetic field behaviors and demonstrated the system's robustness and performance through experimental verification involving varying concentrations of CaCl solutions.
Electromagnetically induced transparency (EIT) originating from quantum physics can lead to a very narrow-band transparent window, which is sensitive to minor environmental changes. The rational construction of highly sensitive EIT metamaterials facilitates its wide sensing application in the terahertz (THz) range. In this work, we designed what we believe to be a novel polarization-independent EIT terahertz metamaterial sensor composed of four symmetrical Chinese Taichi-like rings and a crossed-shaped structure.
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