Abstract
In this study, we investigate the optical response and plasmonic features of a multilayer 4π-spiral composed of metal-semiconductor arms, numerically, by employing a finite-difference time-domain method. We verified that the proposed structure is able to support strong plasmon and Fano resonances in the circular arms. We showed that the negative polarizability of the spiral provides an opportunity to consider the examined 4π-spiral structure as a meta-atom. Quantifying the effective refractive index of the structure for the presence of various semiconductor substances such as Si, GaP, and InP, we obtained the highest possible value for the associated figure of merit (FOM). Ultimately, for a finite spiral structure with a compositional and multilayer arrangement of Au and GaP arms, the FOM is determined as approximately ~62.3.
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This work is supported by NSF CAREER program with the Award number: 0955013.
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Ahmadivand, A., Pala, N. Plasmon response of a metal-semiconductor multilayer 4π-spiral as a negative-index metamaterial. J Nanopart Res 16, 2764 (2014). https://doi.org/10.1007/s11051-014-2764-9
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DOI: https://doi.org/10.1007/s11051-014-2764-9