Controllable near-field intensity and spot size of hybrid terahertz metamaterial.
Controllable near-field intensity and spot size of hybrid terahertz metamaterial.
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DOI：
10.1364/ol.40.001745
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发表时间：
2015-04
期刊：
影响因子：
3.6
通讯作者：
Dejia Meng;M. N. Hoque;Wei Wang;Zhaoyang Fan;Kejia Wang;J. Lai;Changhong Chen
中科院分区：
文献类型：
--
作者：
Dejia Meng;M. N. Hoque;Wei Wang;Zhaoyang Fan;Kejia Wang;J. Lai;Changhong Chen
报道了一种有源太赫兹超材料在裂环谐振器(SRR)禁带附近的可控近场。作为平行板电容器的延伸，图案化VO2被集成到金属SRR中，通过其金属-绝缘体的转变来控制近场强度和热点尺寸。这种设计通过防止VO2介质在强烈增强的近场击穿而提高了器件的可靠性。该器件的近场强度和光斑尺寸在很大范围内是可调的，并且能够补偿由于近场耦合引起的不同相互作用引起的谐振频率漂移。它提供了一种通过强增强和可调谐的近场来主动操纵光-物质相互作用的有效方法。
We report controllable near fields around split-ring resonator (SRR) gaps of an active terahertz metamaterial. As extension of parallel-plate capacitors, patterned VO2 is integrated into the metallic SRRs to manipulate the near-field intensity and hot spot size through its metal-insulator transition. This design enhances the device reliability by preventing VO2 dielectric breakdown at a strongly enhanced near field. The near-field intensity and spot size are tunable in broad ranges, and the device is demonstrated to be capable of compensating resonant frequency drift arisen from different interactions due to near-field coupling. It provides an effective method to actively manipulate the light-matter interaction through the strongly enhanced and tunable near fields.