[1] R. F. Cregan, B. J. Mangan, J. C. Knight, T. A. Birks, P. S. Russell, P. J. Roberts and D. C. Allan, Science 285, 1537 (1999).
[2] J. C. Knight, T. A. Birks, P. S. Russell and D. M. Atkin, Optics Letters 21, 1547 (1996).
[3] J. C. Knight and P. S. J. Russell, Science 296, 276 (2002).
[4] K. Tajima, J. Zhou, K. Nakajima and K. Sato, Journal of Lightwave Technology 22, 7 (2004).
[5] H. Ademgil, Optik 125, 6274 (2014).
[6] A.M. Pinto and M. Lopez-Amo, Journal of Sensors 2012, 1 (2012).
[7] T. A. Birks, J. C. Knight and P. St. J. Russell, Optics Letters 22, 961 (1997).
[8] Y. Liu and H. W. M. Salemink, Europhysics Letters 107, 1160 (2014).
[9] Y. H. Chang, Y. Y. Jhu and C. J. Wu, Optics Communications 285, 1501 (2012).
[10] Y. N. Zhang, Y. Zhao and Q. Wang, Sensors & Actuators: B. Chemical 184, 179 (2013).
[11] T. W. Lu and P. T. Lee, Optics Express 17, 1518 (2009).
[12] W. C. Lai, S. Chakravarty, Y. Zou and R. T. Chen, Optics Letters 38, 3799 (2013).
[13] S. Zheng, Y. Zhu and S. Krishnaswamy, Nanofilm- Coated Photonic Crystal Fiber Long-Period Gratings with Modal Transition for High Chemical Sensitivity and Selectivity, Proceedings of SPIE - The International Society for Optical Engineering 8346, 1844 (2012).
[14] P. Hu, X. Dong, W. C. Wong, L. H. Chen, K. Ni and C. C. Chan, Applied Optics 54, 2647 (2015).
[15] E. K. Akowuah, T. Gorman, H. Ademgil, S. Haxha, G. K. Robinson and J. V. Oliver, IEEE Journal of Quantum Electronics 8, 1403 (2012).
[16] T.M. Monro, W. Belardi, K. Furusawa, J.C. Baggett, N.G.R. Broderick and D.J. Richardson, Measurement Science and Technology 12, 854 (2001).
[17] X. L. Lu, X. D. Zhang, N. Chen, M. Chang and B. X. Li, Optik 220, 165021 (2020).
[18] K. K. Guo, H. Jun, S. Q. Cao, M. X. Hou, Z. Zhe, G. X. Xu and Y. P. Wang, Optics Express 26, 34699 (2018).
[19] B. C. Wang, L. Y. Ren, X. D. Kong, Y. P. Xu, K. L. Ren, W. X. Yang, S. B. Cheng, F. Chen and F. Song, Optik 207, 164454 (2020).
[20] M. F. H. Arif and M. J. H. Biddut, Sensing and Bio-Sensing Research 12, 8 (2017).
[21] M. F. H. Arif and M. J. H. Biddut, Optik 131, 697 (2017).
[22] H. Ademgil and S. Haxha, Optik 127, 6653 (2016).
[23] Y. L. Hoo, W. Jin, H. L. Ho, D. N. Wang and R. S. Windeler, Optical Engineering 41, 8 (2002).
[24] J. B. Jensen, P. E. Hoiby, G. Emiliyanov, O. Bang, L. H. Pedersen and A. Bjarklev, Optics Express 13, 5883 (2005).
[25] B. T. Kuhlmey, B. J. Eggleton and D. K. C. Wu, Journal of Lightwave Technology 27, 1617 (2009).
[26] M. Vieweg, T. Gissibl, S. Pricking, B. T. Kuhlmey, D. C. Wu, B. J. Eggleton and H. Giessen, Optics Express 18, 25232 (2010).
[27] J. Park, S. Lee, S. Kim and K. Oh, Optics Express 19, 1921 (2011).
[28] M. Liu, H. T. Yuan, P. Shum, C. Shao, H. N. Han and L. H. Chu, Applied Optics 57, 6383 (2018).
[29] H. L. Chen, S. G. Li, G. W. An, J. S. Li, Z. K. Fan and Y. Han, Plasmonics 10, 57 (2015).
[30] I. H. Malitson, Journal of the Optical Society of America 55, 1205 (1965).