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Appl. Sci. 2018, 8(3), 386; doi:10.3390/app8030386

Nanometric Plasmonic Rulers Based on Orthogonal Plasmonic Gap Modes in Metal Nanoblocks

Department of Physics, Chung-Ang University, Seoul 06974, Korea
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Received: 22 January 2018 / Revised: 21 February 2018 / Accepted: 28 February 2018 / Published: 6 March 2018
(This article belongs to the Special Issue Photonic Metamaterials)
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Abstract

We theoretically propose a three-dimensional (3D) plasmonic ruler based on orthogonal plasmonic gap modes which have different wavelengths. The ruler consists of three silver nanoblocks with two ten-nanometer air gaps. First, in a two-block structure, the lateral displacement of one block can be determined by the absorption spectrum, in which two orthogonal modes are observed with different wavelengths. Secondly, in a three-block structure, due to the distinctive wavelength dependencies on the x- or y-directional movement of the two orthogonal modes and the strong dependencies on the air gap size, the 3D positioning of one nanoblock relative to a reference nanoblock can be measured with a 2.5 nm resolution using the spectral positions of the absorption spectrum. View Full-Text
Keywords: surface plasmon; plasmon ruler; sensor; nanoparticles surface plasmon; plasmon ruler; sensor; nanoparticles
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Lee, T.-W.; Lee, Y.J.; Shin, E.; Kwon, S.-H. Nanometric Plasmonic Rulers Based on Orthogonal Plasmonic Gap Modes in Metal Nanoblocks. Appl. Sci. 2018, 8, 386.

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