Abstract
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.
This is a preview of subscription content, log in via an institution to check access.
Similar content being viewed by others
References
Barron, L.D.: Molecular Light Scattering and Optical Activity. Cambridge University Press, Cambridge (2004)
Decker, M., Zhao, R., Soukoulis, C., Linden, S., Wegener, M.: Twisted split-ring-resonator photonic metamaterial with huge optical activity. Opt. Lett. 35(10), 1593–1595 (2010)
Fan, Z., Govorov, A.O.: Plasmonic circular dichroism of chiral metal nanoparticle assemblies. Nano Lett. 10(7), 2580–2587 (2010)
Ferguson, B., Zhang, X.C.: Terahertz magnetic response from artificial materials. Nat. Mater. 1, 26–33 (2002)
Gansel, J.K., Thiel, M., Rill, M.S., Decker, M., Bade, K., Saile, V., von Freymann, G., Linden, S., Wegener, M.: Gold helix photonic metamaterial as broadband circular polarizer. Science 325(5947), 1513–1515 (2009)
Gorkunov, M., Ezhov, A., Artemov, V., Rogov, O., Yudin, S.: Extreme optical activity and circular dichroism of chiral metal hole arrays. Appl. Phys. Lett. 104(22), 221102 (2014)
Hauge, E.H., Støvneng, J.A.: Tunneling times: a critical review. Rev. Mod. Phys. 61, 917–936 (1989)
Jaggard, D., Mickelson, A., Papas, C.: On electromagnetic waves in chiral media. Appl. Phys. 18(2), 211–216 (1979)
Kenanakis, G., Zhao, R., Stavrinidis, A., Konstantinidis, G., Katsarakis, N., Kafesaki, M., Soukoulis, C., Economou, E.: Flexible chiral metamaterials in the terahertz regime: a comparative study of various designs. Opt. Mater. Express 2(12), 1702–1712 (2012)
Li, Z., Mutlu, M., Ozbay, E.: Chiral metamaterials: from optical activity and negative refractive index to asymmetric transmission. J. Opt. 15(2), 023001 (2013)
Luan, P., Wang, Y.T., Zhang, S., Zhang, X.: Electromagnetic energy density in a single-resonance chiral metamaterial. Opt. Lett. 36(5), 675–677 (2011)
Miyamaru, F., Hiroki, M., Nishiyama, Y., Nishida, T., Nakanishi, T., Kitano, M., Takeda, M.W.: Ultrafast optical control of group delay of narrow-band terahertz waves. Sci. Rep. 4, 43461 (2014)
Ordal, M.A., Bell, R.J., Alexander, R., Long, L., Querry, M.: Optical properties of fourteen metals in the infrared and far infrared: Al Co, Cu, Au, Fe, Pb, Mo, Ni, Pd, Pt, Ag, Ti, V, and W. Appl. Opt. 24(24), 4493–4499 (1985)
Pendry, J.B.: A chiral route to negative refraction. Science 306, 1353–1355 (2004)
Smith, D.R., Pendry, J.B., Wiltshire, M.C.K.: Metamaterials and negative refractive index. Science 305, 788–792 (2004)
Solymar, L., Shamonina, E.: Waves in Metamaterials. Oxford University Press, Oxford (2009)
Wang, B., Zhou, J., Koschny, T., Kafesaki, M., Soukoulis, C.M.: Chiral metamaterials: simulations and experiments. J. Opt. A 11, 114003 (2009)
Winful, H.G.: Tunneling time, the Hartman effect, and superluminality: a proposed resolution of an old paradox. Phys. Rep. 436(12), 1–69 (2006)
Yen, T.J., Padilla, W.J., Fang, N., Vier, D.C., Smith, D.R., Pendry, J.B., Basov, D.N., Zhang, X.: Terahertz magnetic response from artificial materials. Science 303, 1494–1496 (2004)
Zhang, C., Cui, T.J.: Negative reflections of electromagnetic waves in a strong chiral medium. Appl. Phys. Lett. 91, 194101 (2007)
Zhao, R., Koschny, T., Soukoulis, C.: Chiral metamaterials: retrieval of the effective parameters with and without substrate. Opt. Express 18(14), 14553–14567 (2010)
Acknowledgments
This work was supported by the Serbian Ministry of Education and Science through Projects III 45005 and III 45010.
Author information
Authors and Affiliations
Corresponding author
Additional information
This article is part of the Topical Collection on Advances in the Science of Light.
Guest Edited by Jelena Radovanovic, Milutin Stepić, Mikhail Sumetsky, Mauro Pereira, and Dragan Indjin.
Rights and permissions
About this article
Cite this article
Stojanović, D.B., Radovanović, J. & Milanović, V. Influence of the geometry of terahertz chiral metamaterial on transmission group delays. Opt Quant Electron 48, 272 (2016). https://doi.org/10.1007/s11082-016-0533-y
Received:
Accepted:
Published:
DOI: https://doi.org/10.1007/s11082-016-0533-y