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Wei Yan, Hua Chen, Yimin Sun and Li Wang *
Laboratory of Optical Physics, Institute of Physics and Center for Condensed Matter Physics,
Chinese Academy of Sciences, Beijing 100190, China
* Email: wangli@aphy.iphy.ac.cn
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Abstract: The extinction spectra for chains of subwavelength-sized metal spheres responding to incident terahertz plane waves are calculated in 0.1-2.5 THz frequency range using a generalized Mie theory. It is found that the coherent coupling between the spheres varies as the number N of spheres in the ensemble increases and finally approaches a steady response, which manifests that the collective excitation of the spheres only exists within a finite spatial scope. Therefore, the spectral responses of the systems strongly depend on the polarization of incident waves, diameter and interspacing of spheres while the detailed conductive properties of metals only play a minor role. Especially, the interaction of the L-mode incident field whose electric field parallel to the array of spheres, with the ensemble, is much stronger than that of the T-mode and shows complicated resonant features.
Keywords: Terahertz, Metamaterials, Metallic Spheres, Extinction Spectrum.
Published: 2009-03-31
Acknowledgments: The work was supported by the National Natural Science Foundation of China (Grant No.10834015), and the National Basic Research Program of China (Grant No. 2007CB310405).
Cite this article:
Wei Yan, Hua Chen, Yimin Sun and Li Wang. Spectral Responses by Chains of Subwavelength-Size Metallic Spheres in Terahertz (THz) Region[J]. International Journal of Terahertz Science and Technology, 2009, Vol.2, No.1: 31-38. DOI:10.11906/TST.031-038.2009.03.04
URL: http://www.tstnetwork.org/10.11906/TST.031-038.2009.03.04
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