Abstract
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 nearfield 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 lightmatter interaction through the strongly enhanced and tunable near fields.
Original language | English (US) |
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Pages (from-to) | 1745-1748 |
Number of pages | 4 |
Journal | Optics Letters |
Volume | 40 |
Issue number | 8 |
DOIs | |
State | Published - 2015 |
Externally published | Yes |
ASJC Scopus subject areas
- Atomic and Molecular Physics, and Optics