| FUNDAMENTAL AREAS OF PHENOMENOLOGY(INCLUDING APPLICATIONS) |
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Dual-Band Negative-Index Materials with Sandwich Configuration |
| WANG Xu-Dong1,2, YE Yong-Hong1, ZHENG Chao1 |
| 1Department of Physics, Nanjing Normal University, Nanjing 210097 2School of Physics and Mathematics, Jiangsu Polytechnic University, Changzhou 213164 |
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| Cite this article: |
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WANG Xu-Dong, YE Yong-Hong, ZHENG Chao 2010 Chin. Phys. Lett. 27 034103 |
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Abstract Dual-band negative-index properties of the silver-SU-8-silver sandwich configuration, perforated with a square array of cross dipole apertures, are simulated and analyzed in the midinfrared region. The first and the second negative-index bands correspond to the (1,0) and (1,1) internal surface plasmon polariton (SPP) modes, respectively. The internal and external SPP modes acquired by the SPP dispersion relation of the metal/dielectric/metal model match well with the simulated transmission peaks. The effective parameters for the two negative-index bands are retrieved using simulated S parameters. The coupling effect between the (1,1) internal SPP mode and the localized resonance mode can be tuned by the arm length of cross dipole, which can weaken or destroy the negative electromagnetic response of the second negative-index band. The electric quadrupole mode of the second negative-index band accounts for its strong dependence on the dielectric loss of the interlayer.
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| Keywords:
41.20.Jb
78.20.Ci
42.25.Bs
73.20.Mf
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Received: 20 August 2009
Published: 09 March 2010
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| PACS: |
41.20.Jb
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(Electromagnetic wave propagation; radiowave propagation)
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78.20.Ci
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(Optical constants (including refractive index, complex dielectric constant, absorption, reflection and transmission coefficients, emissivity))
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42.25.Bs
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(Wave propagation, transmission and absorption)
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73.20.Mf
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(Collective excitations (including excitons, polarons, plasmons and other charge-density excitations))
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