Journal
OPTICS LETTERS
Volume 40, Issue 8, Pages 1745-1748Publisher
OPTICAL SOC AMER
DOI: 10.1364/OL.40.001745
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Funding
- National NSF of China [61176064, 61474051]
- National Science Foundation [ECCS-1128644]
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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. (C) 2015 Optical Society of America
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