Noble Metal Doped Optical Fiber for Specialty Light Source
We report noble metal doped optical fiber which is suitable for laser and helps enhancing fluorescence when it is doped with active elements. Silver nano-clusters (average diameter 1.5 nm) in the core of a standard step index fiber are doped using standard fiber fabrication method. These fibers show broad visible fluorescence in the wavelength range 420–700 nm under 405 nm excitation. This appears to occur due to long interaction length of pump light with the metal nano-clusters and quantum confinement effect. We observe enhanced fluorescence from rare earth ions (i.e. Tm3+ and Yb3+) in presence of silver nano-clusters when the optimized length of the fiber is pumped by using 980 nm fiber-pig-tailed laser diode. The experimental results are explained with the help of analytical and quantum mechanical models. These fibers would be helpful to make efficient optical fiber based light sources mostly in the visible range.
Part of the work of RC & SKB is supported by CSIR Emeritus Scientist Scheme-21(1017)/15/EMR-II. Authors are indebted to Director, CSIR-CGRI, Kolkata for his support and encouragement and Director, IACS, Kolkata for his unstinted cooperation.
- 1.Scholl J. A., Koh A. L. and Dionne J. A., Quantum plasmon resonances of individual metallic nanoparticles, Nature, 483, 421–427 (2012).Google Scholar
- 2.Mie G., contributions to the optics of turbid media, particularly solution of colloidal metals, Ann. der Physik., 25, 377–445 (1908).Google Scholar
- 3.Kelly K. L. et. al., The Optical Properties of Metal Nanoparticles: The Influence of Size, Shape, and Dielectric Environment, J. Phys. Chem. B, 107, 668–677 (2003).Google Scholar
- 4.Baletto F. and Ferrando R., Structural properties of nanoclusters: Energetic, thermodynamic, and kinetic effects, Rev. Mod. Phys., 77, 371–423 (2005).Google Scholar
- 5.He Y. and Zeng T., First-Principles Study and Model of Dielectric Functions of Silver Nanoparticles, J. Phys. Chem. C, 114, 18023–18030 (2010).Google Scholar
- 6.Koledintseva M. Y. et. al., Representation of permittivity for multi-phase dielectric mixtures in FDTD modeling, International Symposium on Electromagnetic Compatibility (EMC 2004) IEEE,, 1, 309–314 (2004).Google Scholar
- 7.Diez I. et. al., Blue, green and red emissive silver nanoclusters formed in organic solvents, Angew. Chem. Int. Ed., 48, 2122–2125 (2009).Google Scholar
- 8.Halder A. et. al., Highly fluorescent silver nanoclusters in alumina-silica composite optical fiber, Appl. Phys. Lett., 106, 2, 011101 (2015).Google Scholar
- 9.Guzatov D. V., Plasmonic enhancement of molecular fluorescence near silver nanoparticles: Theory, modeling, and experiment, J. Phys. Chem. C, 116, 10723–10733 (2012).Google Scholar
- 10.Chattopadhyay R. et. al., Quantum sized Ag nanocluster assisted fluorescence enhancement in Tm3+-Yb3+ doped optical fiber beyond plasmonics Appl. Phys. Lett., 107, 233107 (2015).Google Scholar
- 11.Morton S. M., Silverstein D. W., and Jensen L., Theoretical studies of plasmonics using electronic structure methods, Chem. Rev., 111, 3962–3994 (2011).Google Scholar
- 12.Maurizio C. et. al., Enhancement of the Er3+ luminescence in Er-doped silica by few-atom metal aggregates, Phys. Rev. B, 83, 195430 (2011).Google Scholar
- 13.Pandozii F. et. al., A spectroscopic analysis of blue and ultraviolet upconverted emissions from Gd3Ga5O12:Tm3+, Yb3+ nanocrystals, J. Phys. Chem. B, 109, 17400–17405 (2005).Google Scholar