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. 2018 Aug 22;18(9):2757. doi: 10.3390/s18092757

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© 2018 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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|r_p|² responses for the following structure parameters. (a) n₀ = 1.52, n₁ = 1.3616, n₂ = 0.18344 + 3.4332i with d₂ = 20 nm; (b) n₀ = 1.52, n₁ = 1.3616, n₂ = 0.18344 + 3.4332i with d₂ = 30 nm; (c) n₀ = 1.52, n₁ = 1.39, n₂ = 0.18344 + 3.4332i with d₂ = 20 nm; (d) n₀ = 1.52, n₁ = 1.39, n₂ = 0.18344 + 3.4332i with d₂ = 30 nm. Each column represents responses due to different sample refractive indices, n₃ = 1.34, 1.35 and 1.36 shown in left, middle and right columns, respectively.

|r_p|² responses for the following structure parameters. (a) n₀ = 1.52, n₁ = 1.3616, n₂ = 0.18344 + 3.4332i with d₂ = 20 nm; (b) n₀ = 1.52, n₁ = 1.3616, n₂ = 0.18344 + 3.4332i with d₂ = 30 nm; (c) n₀ = 1.52, n₁ = 1.39, n₂ = 0.18344 + 3.4332i with d₂ = 20 nm; (d) n₀ = 1.52, n₁ = 1.39, n₂ = 0.18344 + 3.4332i with d₂ = 30 nm. Each column represents responses due to different sample refractive indices, n₃ = 1.34, 1.35 and 1.36 shown in left, middle and right columns, respectively.