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Simulation, Fabrication and Characterization of THz Metamaterial Absorbers

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Published on: December 27, 2012

Optically thin terahertz metamaterials.

Ranjan Singh¹, Evgenya Smirnova, Antoinette J Taylor

¹School of Electrical and Computer Engineering, Oklahoma State University, Stillwater, Oklahoma 74078, USA.

|June 12, 2008

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Terahertz spectroscopy reveals how metamaterial resonances change with thin lead film thickness. Inductor-capacitor and dipole resonances emerge and strengthen as thickness increases, then saturate.

Area of Science:

Metamaterials Science
Optics and Photonics
Condensed Matter Physics

Background:

Optically thin metamaterials exhibit unique electromagnetic responses.
Split-ring resonators (SRRs) are key structures for metamaterial research.
Understanding resonance behavior at sub-skin-depth is crucial for device applications.

Purpose of the Study:

To investigate the resonant properties of optically thin metamaterials.
To analyze the influence of constituent film thickness on metamaterial resonances.
To characterize the behavior of inductor-capacitor (LC) and dipole resonances in planar double SRRs.

Main Methods:

Terahertz time-domain spectroscopy (THz-TDS) was employed.
Planar double split-ring resonators (SRRs) with varying lead (Pb) film thicknesses were fabricated.

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Resonant frequencies and their evolution with thickness were measured.

Main Results:

Both LC and dipole resonances showed distinct evolution with Pb film thickness.
The LC resonance signature emerged at a critical thickness of approximately 0.15 skin depth.
Resonances were significantly enhanced at sub-skin-depth thicknesses and saturated beyond the skin depth.

Conclusions:

Metamaterial resonance behavior is strongly dependent on sub-skin-depth constituent film thicknesses.
A critical thickness exists for the emergence of specific resonance modes.
The findings provide insights for designing metamaterial devices with tailored resonant properties.