Abstract
Based on the fishnet negative index metamaterials (NIMs) of circular-shaped holes operating at optical frequencies, the influence of modifying the hole shape is studied using the commercial software package CST Microwave studio. Numerical simulations show that, even a tiny modification may lead to broadening of the negative refractive band. So we designed two fishnet NIMs of the gradient holes and half-global holes. Compared with the fishnet NIMs of circular-shaped holes, these two structures can realize negative refraction at multi-frequency bands, and the resonance frequencies exhibit an obvious red-shift. We present a chemical technique for preparing the fishnet NIMs of half-global holes, which is a simple and feasible way to realize multiband negative index metamaterials at optical frequencies.
Original language | English |
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Pages (from-to) | 3220-3223 |
Number of pages | 4 |
Journal | Wuli Xuebao/Acta Physica Sinica |
Volume | 58 |
Issue number | 5 |
State | Published - May 2009 |
Keywords
- Fishnet structure
- Multi-band
- Negative refraction