Wednesday, July 31, 2013
Metamaterials deliver broadband terahertz transparency window
Mimicking the quantum phenomena of electromagnetic-induced transparency (EIT) or plasmon-induced transparency (PIT) in metamaterials offers a unique route to exploit the coherent coupling effects in classical resonators. Within the transparency window, the high dispersion property of the meta-media may lead to remarkable slow-light phenomena and enhanced nonlinear effects. Such PIT metamaterials are promising candidates for designing slow light devices, highly sensitive sensors, and nonlinear elements operating over a broad frequency range.
In a recent study, scientists from Tianjin University (TJU) in China, the King Abdullah University of Science and Technology in Saudi Arabia, Osaka University in Japan, and Oklahoma State University in the US have developed a unique and easily fabricated metamaterial and successfully achieved a flat PIT window over 0.4 THz broad bandwidth.
It was found that the significantly strengthened coupling and the coexistence of electrical and magnetic power exchange are the dominant factors accounting for the broadband transparency feature. In addition, tuning the PIT bandwidth could also be accomplished through adjusting the geometrical parameters of the proposed unit resonators.
Further details can be found in the journal Nanotechnology 24214003.
The TJU team and its collaborators are dedicated to exploring the frontiers of terahertz metamaterials, plasmonics, invisibility cloaking, terahertz radar, terahertz interactions with matters, and terahertz bio-science. The team is also interested in developing new terahertz technology for real-world applications. Miss Zhihua Zhu is a graduate student at TJU, under the supervision of Prof. Jiaguang Han and Prof. Weili Zhang. Her research focuses on the PIT phenomenon and chiral metamaterials.