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Crossover from capacitive to inductive electromagnetic responses in near self-complementary metallic checkerboard
Optics Express
|October 17, 2014
Summary
Metallic checkerboard patterns (MCPs) show significant spectral changes when metal squares connect. This sensitivity enables revealing optically hidden patterns using terahertz beams.
Area of Science:
- Optics
- Metamaterials
- Terahertz Spectroscopy
Background:
- Near-self-complementary metallic checkerboard patterns (MCPs) are sensitive to structural changes.
- Transmission spectra analysis is crucial for understanding material properties.
Purpose of the Study:
- To investigate the transmission spectra of metallic checkerboard patterns (MCPs).
- To explore the impact of metal square connectivity on spectral properties.
- To demonstrate an application in revealing optically hidden patterns.
Main Methods:
- Fabrication of near-self-complementary MCPs using printing technology.
- Measurement and analysis of terahertz transmission spectra.
- Application of Kramers-Kronig relations for spectral interpretation.
Main Results:
- Transmission spectra exhibit drastic changes upon metal square contact.
- Spectra show transmission-invariant frequencies, indicating a superposition of two spectral types.
- The ratio of these spectral types depends on the nominal square size.
Conclusions:
- The connectivity of metal squares in MCPs significantly influences their terahertz transmission spectra.
- Kramers-Kronig relations provide insight into spectral correlations.
- MCPs can be utilized to optically reveal hidden patterns with terahertz beams.
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