Influence of the geometry of terahertz chiral metamaterial on transmission group delays

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• 作者：Danka B. Stojanović ; Jelena Radovanović…
• 关键词：Chiral metamaterial ; Terahertz ; Group delay ; Circular polarisation
• 刊名：Optical and Quantum Electronics
• 出版年：2016
• 出版时间：April 2016
• 年：2016
• 卷：48
• 期：4
• 全文大小：521 KB
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• 作者单位：Danka B. Stojanović (1) (2)
  Jelena Radovanović (1)
  Vitomir Milanović (1)
  
  1. School of Electrical Engineering, University of Belgrade, Bulevar Kralja Aleksandra 73, Belgrade, Serbia
  2. Laboratory of Atomic Physics, Vinča Institute of Nuclear Sciences, University of Belgrade, Mike Petrovića Alasa 12-14, Belgrade, Serbia
  
• 刊物主题：Optics, Optoelectronics, Plasmonics and Optical Devices; Electrical Engineering; Characterization and Evaluation of Materials; Computer Communication Networks;
• 出版者：Springer US
• ISSN：1572-817X

文摘

Recently, group delay has been proven as a very convenient tool for control of terahertz electromagnetic signals used for filters, waveguides and polarization components. Here, we investigate the propagation of circularly polarised terahertz pulse via analysis of group delays in Ω particle chiral metamaterial. When varying the geometry of the Ω particle chiral metamaterial, significant modification of chiroptical effects—optical activity and circular dichroism can be observed. Through the analysis of group delays in the frequency region between 1 and 3 THz we conclude that the right circularly polarised wave is more sensitive to changes in the geometry than the left circularly polarised wave. This result implies that the right circularly polarised wave is responsible for variation of chiroptical effects in these structures and opens up a possibility for potential applications.