Center for Subwavelength Optics and Department of Physics and Astronomy, Seoul National University, Seoul 151-747, Korea.
Nano Lett. 2010 Jun 9;10(6):2064-8. doi: 10.1021/nl1002153.
Unusual performances of metamaterials such as negative index of refraction, memory effect, and cloaking originate from the resonance features of the metallic composite atom(1-6). Indeed, control of metamaterial properties by changing dielectric environments of thin films below the metallic resonators has been demonstrated(7-11). However, the dynamic control ranges are still limited to less than a factor of 10,(7-11) with the applicable bandwidth defined by the sharp resonance features. Here, we present ultra-broad-band metamaterial thin film with colossal dynamic control range, fulfilling present day research demands. Hybridized with thin VO(2) (vanadium dioxide) (12-18) films, nanoresonator supercell arrays designed for one decade of spectral width in terahertz frequency region show an unprecedented extinction ratio of over 10000 when the underlying thin film experiences a phase transition. Our nanoresonator approach realizes the full potential of the thin film technology for long wavelength applications.
超宽频带超材料薄膜具有巨大的动态调控范围，满足了当前研究的需求。该薄膜与超薄 VO2（氧化钒）（12-18）薄膜结合，设计用于太赫兹频率范围内十年光谱宽度的纳米谐振器超晶格阵列，在底层薄膜经历相变时，其消光比超过 10000。我们的纳米谐振器方法实现了薄膜技术在长波长应用中的全部潜力。
