[1] M. F. Frasco and N. Chaniotakis, Sensors 9, 7266 (2009).

[2] B. Larrión, M. Hernáez, F. J. Arregui, J. Goicoechea, J. Bravo and I. Matías, Journal of Sensors 2009, 932471 (2009).

[3] Devin Pugh-Thomas, Brian M. Walsh and Mool C. Gupta, Nanotechnology 22, 185503 (2011).

[4] Pramod R. Watekar, Seongmin Ju, Su-Ah Kim, Seongmook Jeong, Youngwoong Kim and Won-Taek Han, Optics Express 18, 17096 (2010).

[5] Helmut C. Y. Yu, Sergio G. Leon-Saval, Alexander Argyros and Geoff W. Barton, Applied Optics 49, 2749 (2010).

[6] Abhishek Joshi, K. Y. Narsingi and M. O. Manasreh, Applied Physics Letters 89, 131907 (2006).

[7] D. Valerini, A. Cretí, M. Lomascolo, R. Cingolani and M. Anni, Physical Review B 71, 235409 (2005).

[8] H. Lange, M. Artemyev, U. Woggon, T. Niermann and C. Thomsen, Physical Review B 77, 193303 (2008).

[9] Pengtao Jing, Jinju Zheng, Micho Ikezawa, Xueyan Liu, Shaozhe Lv, Xianggui Kong, Jialong Zhao and Yasuaki Masumoto, J. Phys. Chem. C 113, 13545 (2009).