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Appl. Sci. 2018, 8(3), 386;

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

Department of Physics, Chung-Ang University, Seoul 06974, Korea
Author to whom correspondence should be addressed.
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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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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This is an open access article distributed under the Creative Commons Attribution License which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly cited (CC BY 4.0).

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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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