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Appl. Sci. 2017, 7(12), 1246;

Wavelength Conversion Enhancement Achieved by Using Resonance in an Array of Nanocylinders

Department of Physics, Chung-Ang University, Seoul 06974, Korea
Author to whom correspondence should be addressed.
Received: 15 October 2017 / Revised: 13 November 2017 / Accepted: 27 November 2017 / Published: 1 December 2017
(This article belongs to the Special Issue Dielectric Metamaterials)
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Upconversion (UC) materials are promising for harvesting visual light. However, the efficiency of UC processes is very low when applied to practical devices. Therefore, we propose an array of UC nanocylinders on a gold substrate and induce electric dipole (ED) and magnetic dipole (MD) resonances to increase the UC process efficiency by increasing light-matter interactions via the nanostructures. The nanocylinders not only increase the absorption of infrared light with a wavelength of 980 nm but also enhance the emission of visible light with a wavelength of 660 nm through surface plasmons and electric dipole resonances. The absorbance of the UC material can be enhanced by coupling with the surface plasmons and coupling with the MDs of each nanocylinder. On the other hand, the emission of visible light can be largely enhanced by increasing the spontaneous emission rate of the Purcell effect in electric dipole resonances and tailoring the output efficiency of the emitted light. In summary, we obtained an absorption enhancement of ×7.3, an average effective upward emission enhancement of ×21, and an improved total UC process of the proposed nanocylinder of ×155. View Full-Text
Keywords: UC material; nanocylinder; Mie resonance UC material; nanocylinder; Mie resonance

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Moon, K.; Lee, Y.J.; Hong, S.; Kwon, S.-H. Wavelength Conversion Enhancement Achieved by Using Resonance in an Array of Nanocylinders. Appl. Sci. 2017, 7, 1246.

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