Tunable Plasmonic Response of Linked Dimer Disks Based on InSb in Terahertz Range

Document Type : Full length research Paper

Authors

Department of Photonic, School of Engineering-Emerging Technologies, University of Tabriz, Tabriz, Iran

Abstract

In thid paper, we have investigated numerically optical properties of a periodic array of linked dimer disks based on InSb, in the THz range, by FDTD (finite difference time domain) method. Simulation results show two THz plasmonic modes; charge transfer plasmon mode (CTP) and bonding dipole plasmon (BDP) mode. The CTP mode originates from the conductive junction of linked dimer disks and the BDP mode is due to the coupling of plasmons. It has shown that optical properties of the proposed structure are highly tunable by varying the geometric parameters of the conductive junction. The length reduction of the bridge between dimer disks increases the localized electric field intensity, and the width enhancement of the path way between dimer disks results in the decrement and increment of the amplitudes of the CTP and BDP modes, respectively. The proposed structure is sensitive to polarization angle of incident light in the frequency range of 0.1 to 2.2 terahertz that can be used as polarization switch in THz range. This plasmonic structure can be have significant applications in the field of security, imaging, and spectroscopy in the THz range.

Keywords


 
[1] M. Tonouchi, Cutting-Edge Terahertz Technology, Nature photonics 1 (2007) 97-105.
[2] C. Jansen, S. Wietzke, O. Peters, M. Scheller, N. Vieweg, M. Salhi, et al., Terahertz Imaging: Applications and Perspectives, Applied optics 49 (2010) E48-E57.
[3] J.F. Federici, B. Schulkin, F. Huang, D. Gary, R. Barat, F. Oliveira, et al., THz Imaging and Sensing for Security Applications—Explosives, Weapons and Drugs, Semiconductor Science and Technology 20 (2005) S266.
[4] V. Giannini, A. Berrier, S.A. Maier, J.A. Sánchez-Gil, J.G. Rivas, Scattering Efficiency and near Field Enhancement of Active Semiconductor Plasmonic Antennas at Terahertz Frequencies, Optics express 18 (2010) 2797-2807.
[5] J. Grant, X. Shi, J. Alton, D. Cumming, Terahertz Localized Surface Plasmon Resonance of Periodic Silicon Microring Arrays, Journal of Applied Physics 109 (2011) 054903.
[6] S.D. Liu, Z. Yang, R.P. Liu, X.Y. Li, Multiple Fano Resonances in Plasmonic Heptamer Clusters Composed of Split Nanorings, ACS Nano 6 (2012) 6260-6271.
[7] C.Y. Tsai, J.W. Lin, C.Y. Wu, P.T. Lin, T.W. Lu, P.T. Lee, Plasmonic Coupling in Gold Nanoring Dimers: Observation of Coupled Bonding Mode, Nano letters 12 (2012) 1648-1654.
[8] N. Zohar, L. Chuntonov, G. Haran, The Simplest Plasmonic Molecules: Metal Nanoparticle Dimers and Trimers, Journal of Photochemistry and Photobiology C: Photochemistry Reviews 21 (2014) 26-39.
[9] D.W. Brandl, N.A. Mirin, P. Nordlander, Plasmon Modes of Nanosphere Trimers and Quadrumers, The Journal of Physical Chemistry B 110 (2006) 12302-12310.
[10] S.D. Liu, Z. Yang, R.P. Liu, X.Y. Li, Multiple Fano Resonances in Plasmonic Heptamer Clusters Composed of Split Nanorings, Acs Nano 6 (2012) 6260-6271.
[11] A. Ahmadivand, S. Golmohammadi, Fano Resonances in Complex Plasmonic Super-Nanoclusters: The Effect of Environmental Modifications on the Lspr Sensitivity, Frontiers of Physics 10 (2015) 222-230.
[12] S. Hanham, A. Fernández‐Domínguez, J.H. Teng, S. Ang, K. Lim, S.F. Yoon, et al., Broadband Terahertz Plasmonic Response of Touching Insb Disks, Advanced Materials 24 (2012).
[13] H. Liu, G. Ren, Y. Gao, B. Zhu, B. Wu, H. Li, et al., Tunable Terahertz Plasmonic Perfect Absorber Based on T-Shaped Insb Array, Plasmonics 11 (2016) 411-417.
[14] J.G. Rivas, C. Janke, P.H. Bolivar, H. Kurz, "Transmission of Thz Radiation through Insb Gratings of Subwavelength Apertures", Optics Express 13 (2005) 847-859.
[15] W. Li, D. Kuang, F. Fan, S. Chang, L. Lin, Subwavelength B-Shaped Metallic Hole Array Terahertz Filter with Insb Bar as Thermally Tunable Structure, Applied optics 51 (2012) 7098-7102.
[16] F. Wen, Y. Zhang, S. Gottheim, N.S. King, Y. Zhang, P. Nordlander, et al., Charge Transfer Plasmons: Optical Frequency Conductances and Tunable Infrared Resonances, ACS Nano 9 (2015) 6428-6435.
[17] M.A. Mahmoud, Plasmon Resonance Hybridization of Gold Nanospheres and Palladium Nanoshells Combined in a Rattle Structure, The journal of physical chemistry letters 5 (2014) 2594-2600.
[18] A.N. Koya, J. Lin, Charge transfer plasmons: Recent theoretical and experimental developments, Applied Physics Reviews, 4 (2017) 021104.
[19] A. Ahmadivand, B. Gerislioglu, R. Sinha, P.K. Vabbina, M. Karabiyik, N. Pala, Excitation of terahertz charge transfer plasmons in metallic fractal structures, Journal of Infrared, Millimeter, and Terahertz Waves, 38 (2017) 992-1003.