Copyright © 2012 P. Bia et al. This is an open access article distributed under the Creative Commons Attribution License, which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly cited.

Linked References

1. H. C. Ren, F. Vollmer, S. Arnold, and A. Libchaber, “High-Q microsphere biosensor—analysis for adsorption of rodlike bacteria,” Optics Express, vol. 15, no. 25, pp. 17410–17423, 2007. View at Scopus
2. F. Vollmer and S. Arnold, “Whispering-gallery-mode biosensing: label-free detection down to single molecules,” Nature Methods, vol. 5, no. 7, pp. 591–596, 2008. View at Publisher · View at Google Scholar · View at Scopus
3. L. Yang and K. J. Vahala, “Gain functionalization of silica microresonators,” Optics Letters, vol. 28, no. 8, pp. 592–594, 2003. View at Scopus
4. G. S. Murugan, M. N. Zervas, Y. Panitchob, and J. S. Wilkinson, “Integrated Nd-doped borosilicate glass microsphere laser,” Optics Letters, vol. 36, no. 1, pp. 73–75, 2011. View at Scopus
5. S. Y. Chen, T. Sun, K. T. V. Grattan, K. Annapurna, and R. Sen, “Characteristics of Er and Er-Yb-Cr doped phosphate microsphere fibre lasers,” Optics Communications, vol. 282, no. 18, pp. 3765–3769, 2009. View at Publisher · View at Google Scholar · View at Scopus
6. P. Féron, “Whispering gallery mode lasers in erbium doped fluoride glasses,” Annales de la Fondation Louis de Broglie, vol. 29, no. 1-2, pp. 317–329, 2004. View at Scopus
7. G. Nunzi Conti, A. Chiasera, L. Ghisa et al., “Spectroscopic and lasing properties of Er³⁺-doped glass microspheres,” Journal of Non-Crystalline Solids, vol. 352, no. 23-25, pp. 2360–2363, 2006. View at Publisher · View at Google Scholar · View at Scopus
8. G. R. Elliott, D. W. Hewak, G. S. Murugan, and J. S. Wilkinson, “Chalcogenide glass microspheres; their production, characterization and potential,” Optics Express, vol. 15, no. 26, pp. 17542–17553, 2007. View at Publisher · View at Google Scholar · View at Scopus
9. L. Mescia, F. Prudenzano, M. De Sario, T. Palmisano, M. Ferrari, and G. C. Righini, “Design of rare-earth-doped microspheres,” IEEE Photonics Technology Letters, vol. 22, no. 6, pp. 422–424, 2010. View at Publisher · View at Google Scholar · View at Scopus
10. K. Totsuka and M. Tomita, “Optical microsphere amplification system,” Optics Letters, vol. 32, no. 21, pp. 3197–3199, 2007. View at Publisher · View at Google Scholar · View at Scopus
11. Y. G. Boucher and P. Féron, “Generalized transfer function: a simple model applied to active single-mode microring resonators,” Optics Communications, vol. 282, no. 19, pp. 3940–3947, 2009. View at Publisher · View at Google Scholar · View at Scopus
12. M. L. Gorodetsky and V. S. Ilchenko, “Optical microsphere resonators: optimal coupling to high-Q whispering-gallery modes,” Journal of the Optical Society of America B, vol. 16, no. 1, pp. 147–154, 1999. View at Scopus
13. C. L. Zou, Y. Yang, C. H. Dong et al., “Taper-microsphere coupling with numerical calculation of coupled-mode theory,” Journal of the Optical Society of America B, vol. 25, no. 11, pp. 1895–1898, 2008. View at Publisher · View at Google Scholar · View at Scopus
14. L. Mescia, P. Bia, M. De Sario, A. Di Tommaso, and F. Prudenzano, “Design of mid-infrared amplifiers based on fiber taper coupling to erbium-dopedmicrospherical resonator,” Optics Express, vol. 20, no. 7, pp. 7616–7629, 2012. View at Publisher · View at Google Scholar · View at Scopus
15. B. E. Little, J. P. Laine, and H. A. Haus, “Analytic theory of coupling from tapered fibers and half-blocks into microsphere resonators,” Journal of Lightwave Technology, vol. 17, no. 4, pp. 704–715, 1999. View at Publisher · View at Google Scholar · View at Scopus
16. K. Vahala, Optical Microcavities, World Scientific Publishing, Singapore, 2004.