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Published on: October 18, 2012
Asymmetric fishnet metamaterials with strong optical activity
Yong-Liang Zhang1, Wei Jin, Xian-Zi Dong
1Laboratory of Organic NanoPhotonics and Key Laboratory of Functional Crystals and Laser Technology, Technical Institute of Physics and Chemistry, Chinese Academy of Sciences, Beijing, China.
Optics Express
|May 9, 2012
Summary
Orienting elliptical holes in asymmetric fishnet metamaterials creates unique optical properties. This research reveals strong polarization rotation and enhanced transmission, useful for designing optical devices.
Area of Science:
- * Nanophotonics and Metamaterials
- * Plasmonics and Optics
Background:
- * Asymmetric fishnet metamaterials offer tunable optical responses.
- * Understanding polarization rotation is key for optical device applications.
Purpose of the Study:
- * To investigate the optical properties of mono- and double-layer asymmetric fishnet metamaterials.
- * To explore the effects of hole orientation on spectral and polarization characteristics.
Main Methods:
- * Analysis of optical properties in the visible spectral range.
- * Electromagnetic field distribution analysis to understand resonance phenomena.
- * Investigating the sensitivity of hybridized modes to structural parameters.
Main Results:
- * Nontrivial hole orientations induce strong polarization rotation and enhanced optical transmission peaks.
- * Spinning localized surface plasmon resonances, driven by asymmetric geometry, cause these effects.
- * Hybridized modes show high sensitivity to dielectric spacing, aspect ratio, and embedding media.
Conclusions:
- * The orientation of elliptical holes significantly impacts spectral and polarization responses.
- * Asymmetric fishnet metamaterials can be designed for chiral applications at optical frequencies.
- * Tailoring metallic nanostructures' polarization behavior is achievable through geometric control.
