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Tunable Unidirectional Coupling of Surface Plasmon Polaritons Utilizing a V-Shaped Slot Nanoantenna Column

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Abstract

A polarization-sensitive V-shaped slot nanoantenna column is utilized to realize tunable unidirectional coupling of surface plasmon polaritons (SPP). Two plasmon resonant modes are excited in the V-shaped slot nanoantennas with x- and y-polarized incident light, respectively. The electric fields of coupled SPP show different symmetries corresponding to that of the two resonant modes. Linear combinations of the two resonant modes result in asymmetric SPP intensity distributions. As a result, by controlling the incident polarizations, tunable unidirectional coupling of SPP to two opposite directions perpendicular to the column at different wavelengths are realized. A highest extinction ratio of 36.7 dB is achieved, and the extinction ratio keeps larger than 7 dB within a wavelength of 149 nm.

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Acknowledgments

This work was supported by the National Key Basic Research Program of China (Grant 2013CB328702) and the National Natural Science Foundation of China (Grants 11374074, 11176009).

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Conflict of Interest

This manuscript has not been submitted to more than one journal for simultaneous consideration. The manuscript has not been published previously (partly or in full). A single study is not split up into several parts to increase the quantity of submissions and submitted to various journals or to one journal over time. No data have been fabricated or manipulated (including images) to support the conclusions. No data, text, or theories by others are presented as if they were the authors’ own. Consent to submit has been received from all coauthors and responsible authorities.

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Authors and Affiliations

  1. Department of Physics, Harbin Institute of Technology, Harbin, 150001, China

    Feng Huang, Hanning Yang, Siren Li, Xiangqian Jiang & Xiudong Sun

  2. Key Lab of Micro-Optics and Photonic Technology of Heilongjiang Province, Harbin, 150001, China

    Feng Huang, Hanning Yang, Siren Li, Xiangqian Jiang & Xiudong Sun

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  1. Feng Huang
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  2. Hanning Yang
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  3. Siren Li
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  4. Xiangqian Jiang
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  5. Xiudong Sun
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Correspondence to Xiudong Sun.

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Huang, F., Yang, H., Li, S. et al. Tunable Unidirectional Coupling of Surface Plasmon Polaritons Utilizing a V-Shaped Slot Nanoantenna Column. Plasmonics 10, 1825–1831 (2015). https://doi.org/10.1007/s11468-015-9988-0

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  • DOI: https://doi.org/10.1007/s11468-015-9988-0

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