Enhancement transmittance of a metamaterial filter based on local surface plasma resonance
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Enhancement transmittance of a metamaterial filter based on local surface plasma resonance Chao Chen, School of Computing Science, Sichuan University of Science and Engineering, Zigong 643000, China; High Performance Computing Center, Sichuan University of Science and Engineering, Zigong 643000, China Fei Wang, School of Computing Science, Sichuan University of Science and Engineering, Zigong 643000, China Yuping Sheng, Analytical and Testing Center, Sichuan University of Science and Engineering, Zigong 643000, China Jun Wang, School of Materials Science and Engineering, Sichuan University of Science and Engineering, Zigong 643000, China Address all correspondence to Chao Chen at [email protected] (Received 25 December 2017; accepted 15 February 2018)
Abstract In this paper, a single-band local surface plasmon mode resonance metamaterial filter is calculated and simulated. The damping constant of the gold film is optimized in simulations to eliminate the effects of the grain boundary and the surface scattering on the transmission property. The transmission property of the designed metamaterial filter can be enhanced through optimizing structural parameters (the vertical distance or radius of the gold particle). Two narrow transmission bands are achieved due to the electric field enhancement effect. The electric field enhancement factor η = |E|/|E0| is used to reveal the electric field resonance strength change. Higher transmission peak and larger field enhancement factor can be achieved than the pure gold hole array structure.
Introduction Metamaterial is an interesting material that is different with natural materials.[1–4] Metamaterial can be applied in many ways, including sensors, photovoltaic cells, thermal emitters, photodetectors, and so on.[5–9] Many metamaterial structures are presented and verified.[10–13] The research and development of metamaterial filters have attracted the interest of researchers. Lu et al.[14] designed and measured a multilayer complementary metamaterial filter. The designed metamaterial filter achieved a high bandpass in 200–300 THz spectrum. Zhu et al. reported and experimentally tested a terahertz bandpass metamaterial filter, which exhibited a 3 dB bandwidth of bandpass through stacking symmetric or asymmetric double layers.[15] High-performance metamaterial filters can be applied in many fields.[15–18] Therefore, many metamaterial filters are reported and confirmed with high transmission performance or extraordinary optical transmission.[19–23] Different methods are proposed to enhance the transmission of metamaterial filters. For example, Wang et al. designed and simulated a compound structure design metamaterial with multiple eccentric or concentric annular apertures in a unit cell, multi-frequencies transmission enhancing simultaneously is simulated verification. Enhancing the transmittance of the metamaterial is interesting and valuable. On the one hand, Chen et al.[24] proposed a sub-wavelength holes array metamaterial and confirmed that the enhanced transmission can be obtain
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