1 September 2009 Self-supported all-metal THz metamaterials
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Abstract
Ideal metamaterials would consist of metal conductors only that are necessary for negative ε and μ. However, most of present-day metamaterials include dielectrics for various support functions. Overcoming dielectrics, we manufactured free-standing THz metamaterials as bi-layer chips of S-string arrays suspended by window-frames at a small gap that controls the resonance frequency. Remaining problems concerning their useful range of incidence angles and the possibility of stacking have been solved by manufacturing the first self-supported free-standing all-metal metamaterials featuring upright S-strings interconnected by metal rods. Large-area slabs show maximum magnetic coupling at normal incidence with left-handed resonances between 3.2 - 4.0 THz. Such metamaterials which we dub the meta-foil represent an ideal platform for including index-gradient optics to achieve optical functionalities like beam deflection and imaging.
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H. O. Moser, H. O. Moser, L. K. Jian, L. K. Jian, H. S. Chen, H. S. Chen, M. Bahou, M. Bahou, S. M. P. Kalaiselvi, S. M. P. Kalaiselvi, S. Virasawmy, S. Virasawmy, S. M. Maniam, S. M. Maniam, X. X. Cheng, X. X. Cheng, S. P. Heussler, S. P. Heussler, Shahrain bin Mahmood, Shahrain bin Mahmood, B.-I. Wu, B.-I. Wu, } "Self-supported all-metal THz metamaterials", Proc. SPIE 7392, Metamaterials: Fundamentals and Applications II, 73920E (1 September 2009); doi: 10.1117/12.826679; https://doi.org/10.1117/12.826679
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