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. 2021 Mar 25;21(7):2300. doi: 10.3390/s21072300

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© 2021 by the authors.

Licensee MDPI, Basel, Switzerland. This article is an open access article distributed under the terms and conditions of the Creative Commons Attribution (CC BY) license (http://creativecommons.org/licenses/by/4.0/).

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(a) The relationship between (|E|/|E₀|⁴) max and the cone angle; (b) the relationship between |E|/|E₀|max and the gap between two AgNPs and the electric field distribution with cone angles of (c) 9°, (d) 15° and (e) 19°.