title: Controllable near-field intensity and spot size of hybrid terahertz metamaterial.
abstract: We report controllable near fields around split-ring resonator (SRR) gaps of an active terahertz metamaterial. As extension of parallel-plate capacitors, patterned VO2is 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 VO2dielectric 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.
authors: Dejia
authors: D
authors: Meng
authors: M N F
authors: MN
authors: Hoque
authors: Wei
authors: W
authors: Wang
authors: Zhaoyang
authors: Z
authors: Fan
authors: Kejia
authors: K
authors: Wang
authors: Jianjun
authors: J
authors: Lai
authors: Changhong
authors: C
authors: Chen