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Related Concept Videos

Double Resonance Techniques: Overview01:12

Double Resonance Techniques: Overview

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Double resonance techniques in Nuclear Magnetic Resonance (NMR) spectroscopy involve the simultaneous application of two different frequencies or radiofrequency pulses to manipulate and observe two distinct nuclear spins. One important application of double resonance is spin decoupling, which selectively suppresses coupling with one type of nucleus while observing the NMR signal from another nucleus, simplifying the spectrum and enhancing resolution.
Spin decoupling is usually achieved by...
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Atomic Nuclei: Magnetic Resonance01:05

Atomic Nuclei: Magnetic Resonance

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The number of nuclear spins aligned in the lower energy state is slightly greater than those in the higher energy state. In the presence of an external magnetic field, as the spins precess at the Larmor frequency, the excess population results in a net magnetization oriented along the z axis. When a pulse or a short burst of radio waves at the Larmor frequency is applied along the x axis, the coupling of frequencies causes resonance and flips the nuclear spins of the excess population from the...
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Related Experiment Video

Updated: Jun 5, 2025

Fabrication of Nanopillar-Based Split Ring Resonators for Displacement Current Mediated Resonances in Terahertz Metamaterials
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Manipulation on radiation angles via spatially organized multipoles with vertical split-ring resonators.

Hao-Yuan Tsai1, Che-Chin Chen2, Chun-Yen Chen1

  • 1Materials Science and Engineering, National Tsing Hua University, Hsinchu, Taiwan.

Nanophotonics (Berlin, Germany)
|December 5, 2024
PubMed
Summary

Researchers reconfigured vertical metamaterials, including single-split ring resonators (SSRRs) and double-split ring resonators (DSRRs), to control radiation patterns. Geometry adjustments enabled precise steering of infrared radiation for optical metadevices.

Keywords:
angular reconfigurationinfrared radiationmetamaterialsnanoantennasplit ring resonatorthree-dimensional metamaterials

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Area of Science:

  • Metamaterials
  • Optics
  • Electromagnetism

Background:

  • Single-split ring resonators (SSRRs) and double-split ring resonators (DSRRs) are fundamental metamaterial components.
  • Controlling the radiation patterns of these resonators is crucial for advanced optical applications.
  • Existing methods for tailoring radiation directionality have limitations.

Purpose of the Study:

  • To tailor the vertical radiation patterns of SSRRs and DSRRs by reconfiguring their geometries.
  • To investigate the effect of unequal arm lengths and pad shifts on resonator radiation.
  • To explore the potential of these tailored resonators in infrared optical metadevices.

Main Methods:

  • Fabrication of vertical metamaterials using a metal-stress-driven self-folding method.
  • Design of resonators with unequal arm lengths to control the floating split angle.
  • Experimental measurement of transmittance and reflectance, validated by simulations.

Main Results:

  • Geometry-dependent angle variation of far-field radiation was demonstrated.
  • Symmetric SSRRs and DSRRs exhibited vertical and horizontal radiation, respectively.
  • Asymmetric SSRRs showed complete rotation to horizontal radiation, while DSRRs rotated up to 45° with pad shift.
  • Directional scattering performance was linked to the manipulation of electric dipole components.

Conclusions:

  • The study successfully demonstrated the reconfiguration of radiation direction in SSRRs and DSRRs.
  • The metal-stress-driven self-folding method provides an effective way to engineer metamaterial radiation.
  • This approach offers a novel pathway for developing compact optical metadevices like color routers and directive IR emitters.