We introduce a plasmon hybridization picture to understand the optical properties of double split-ring resonator metamaterials. The analysis is based on the calculated reflectance spectra from a finite-integration time-domain algorithm. Field distributions of the double split-ring resonators at the resonant frequencies confirm the results from the plasmon hybridization analysis. We demonstrate that the plasmon hybridization is a simple and powerful tool for understanding and designing metamaterials in the near infrared and visible regime.
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http://dx.doi.org/10.1364/oe.15.012095 | DOI Listing |
Biosensors (Basel)
November 2024
Institute of Laser Engineering, Osaka University, Suita 565-0871, Osaka, Japan.
Biosensors operating in the terahertz (THz) region are gaining substantial interest in biomedical analysis due to their significant potential for high-sensitivity trace-amount solution detection. However, progress in compact, high-sensitivity chips and methods for simple, rapid and trace-level measurements is limited by the spatial resolution of THz waves and their strong absorption in polar solvents. In this work, a compact nonlinear optical crystal (NLOC)-based reflective THz biosensor with a few arrays of asymmetrical meta-atoms was developed.
View Article and Find Full Text PDFACS 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 PDFSensors (Basel)
September 2024
CINVESTAV-IPN, Telecommunications Section, Av. IPN 2508, San Pedro Zacatenco, Ciudad de México 07360, Mexico.
This article presents a symmetrical reduced-size eight-element MIMO antenna array with high electromagnetic isolation among radiators. The array utilizes easy-to-build techniques to cover the n77 and n78 new radio (NR) bands. It is based on an octagonal double-negative metamaterial split-ring resonator (SRR), which enables a size reduction of over 50% for the radiators compared to a conventional disc monopole antenna by increasing the slow-wave factor.
View Article and Find Full Text PDFSensors (Basel)
September 2024
Terahertz Research Center, School of Electronic Science and Engineering, University of Electronic Science and Technology of China, Chengdu 611731, China.
Chaos
July 2024
Department of Physics & Astronomy, University of North Carolina Greensboro, Greensboro, North Carolina 27402, USA.
A nonlinear RLC resonator is investigated experimentally and numerically using bifurcation analysis. The nonlinearity is due to the parallel combination of a semiconductor rectifier diode and a fixed capacitor. The diode's junction capacitance, diffusion capacitance, and DC current-voltage relation each contribute to the nonlinearity.
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