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Updated: Jun 21, 2025
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Fabrication of Nanopillar-Based Split Ring Resonators for Displacement Current Mediated Resonances in Terahertz Metamaterials
Published on: March 23, 2017
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3D Bulk Metamaterials with Engineered Optical Dispersion at Terahertz Frequencies Utilizing Amorphous Multilayered
Ying Huang1, Takanori Kida1, Shun Wakiuchi1
1Department of Robotics, Tohoku University, Sendai, Miyagi, 980-8579, Japan.
Summary
A novel 3D bulk metamaterial (MM) offers engineered refractive index and optical isotropy for terahertz (THz) devices. Its design allows for large-scale manufacturing and shape flexibility, enabling advanced applications like high-resolution spectroscopy prisms.
Area of Science:
- Metamaterials
- Terahertz (THz) Optics
- Nanophotonics
Background:
- Metamaterials offer unique electromagnetic properties not found in natural materials.
- Engineering bulk metamaterials for specific optical functions, especially at THz frequencies, remains a challenge.
- Conventional methods for bulk metamaterial fabrication can be complex and limited in scalability.
Purpose of the Study:
- To propose, fabricate, and evaluate a 3D bulk metamaterial (MM) with amorphous multilayered split-ring resonators.
- To demonstrate the engineering of the effective refractive index and optical dispersion.
- To highlight the advantages of this MM for THz optical devices.
Main Methods:
- Fabrication of a 3D bulk metamaterial using amorphous multilayered split-ring resonators.
- Experimental evaluation of the effective refractive index and its frequency dependence.
- Characterization of optical isotropy and transmission properties.
- Tailoring optical dispersion by adjusting resonator density.
Main Results:
- Achieved engineered effective refractive index with a contrast of 0.118 across 0.315–0.366 THz.
- Demonstrated a high index change slope of 2.314 per THz.
- Confirmed optical isotropy with respect to polarization.
- Successfully tailored peak transmission and optical dispersion via resonator density.
Conclusions:
- The proposed 3D bulk MM provides a versatile platform for THz applications.
- Advantages include large-scale manufacturing potential, shape adaptability, optical isotropy, and rapid optical dispersion.
- This MM is promising for developing dispersive optical devices, such as high-dispersive prisms for spectroscopy.
