Lee Y U, Choi E Y, Woo J H, Kim E S, Wu J W
Department of Physics, Ewha Womans University, Seoul 120-750, South Korea.
Opt Express. 2013 Jul 29;21(15):17492-7. doi: 10.1364/OE.21.017492.
Electric switching of reflection resonances at near-IR spectral range is experimentally demonstrated in a reflective metamaterial twisted nematic liquid crystal cell. Reflective metamaterial composed of nano-sized double-split ring resonator aperture is fabricated by a focused ion beam milling. Two-fold rotational symmetry of double-split ring resonators allows for two orthogonal polarization-dependent reflection resonances in the reflective metamaterial. With an external voltage of 10V across 12μm cell gap, a full switching is achieved between two reflection resonances. Dynamic measurements show the time constants of switch-on and switch-off are in the order of 100ms and 10ms, respectively.
在反射型超材料扭曲向列型液晶盒中，通过实验证明了近红外光谱范围内反射共振的电切换。由纳米尺寸的双裂环谐振器孔径组成的反射型超材料是通过聚焦离子束铣削制造的。双裂环谐振器的二重旋转对称性使得反射型超材料中存在两个正交的偏振相关反射共振。在12μm的单元间隙上施加10V的外部电压时，可在两个反射共振之间实现完全切换。动态测量表明，开启和关闭的时间常数分别约为100ms和10ms。
