Plasmon-induced transparency in terahertz metamaterials markedly modifies the dispersive properties of an otherwise opaque medium and reveals unprecedented prospects on novel functional components. However, plasmon-induced transparency in metamaterials so far exists in a narrow frequency band or without actively tunable abilities. Here, we demonstrate optical control of a broadband plasmon-induced transparency in a hybrid metamaterial made from integrated silicon–metal unit cells. Attributed to the modification in damping rate of the dark mode resonators under optical excitation, a giant dynamic amplitude modulation of the broadband transparency window is observed. The scheme suggested here is promising in developing broadband active slow-light devices and realizing on-to-off switching responses of the terahertz radiation at room temperature.
(a) Schematic diagram of the active broadband PIT metamaterial. The geometrical parameters are: $l = 86 muhbox{m}$, $a = 28 muhbox{m}$, $b = 48 muhbox{m}$, $w = 4 muhbox{m}$, $D_{rm x}= 26 muhbox{m}$, $D_{rm y}= 10 muhbox{m}$, $P_{rm x}= 114 muhbox{m}$, and $P_{rm y}= 134 muhbox{m} $. The bottom right of panel (a) is a microscopic image of the fabricated metamaterial. (b) Experimental diagram of the optical pump-terahertz probe measurement.Published in:
Photonics Journal, IEEE (Volume:7 , Issue: 1 )- Article#:
- 5900108
- ISSN :
- 1943-0655
- DOI:
- 10.1109/JPHOT.2015.2390146
- Date of Publication :
- 13 January 2015
- Date of Current Version :
- 30 January 2015
- Issue Date :
- Feb. 2015
- Sponsored by :
- IEEE Photonics Society
- Publisher:
- IEEE
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