Journal
JOURNAL OF THE OPTICAL SOCIETY OF AMERICA B-OPTICAL PHYSICS
Volume 30, Issue 6, Pages 1392-1396Publisher
OPTICAL SOC AMER
DOI: 10.1364/JOSAB.30.001392
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Funding
- Ministerio de Economia y Competitividad of Spain (MINECO) within the National Program of Materials [MAT2010-21270-C04-02/-03/-04]
- Fundamental Research Program [FIS2012-38244-C02-01]
- Consolider-Ingenio Program [MALTA CSD2007-0045]
- EU-FEDER
- ACIISI of Gobierno de Canarias [ID20100152]
- government of Spain [PRI-PIBIN-2011-1153/DST-INT-Spain-P-38-11]
- government of India [PRI-PIBIN-2011-1153/DST-INT-Spain-P-38-11]
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We report the enhancement of the blue upconversion emission in a Tm3+-Yb3+ codoped fluoroindate glass covered with silica microspheres. Each microsphere produces a photonic nanojet that concentrates the illuminating beam in a tiny region of the glass, increasing the intensity per unit area and so the upconversion emission by a factor of 3. Moreover, the mean size of the emission area has been reduced by a factor of root 3 due to the three-photon process involved in the blue emission band. The experimental values of the full width at half-maximum of the emission spots have been found to be in agreement with the theoretical values obtained from finite-difference time-domain simulations. (C) 2013 Optical Society of America
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