[1] Y. Zhao, Q.-l. Wu and Y.-n. Zhang, Sensors Actuators B: Chem. 258, 822 (2018).

[2] Y. Qian, Y. Zhao, Q.-l. Wu, Y. J. S. Yang and A. B. Chemical, Sensors and Actuators B: Chemical 260, 86 (2018).

[3] J. Wang and B. Chen, Sensors and Actuators A: Physical 184, 53 (2012).

[4] W. Chuang, G. Bai-Ou, L. Chao and T. Hwa-Yaw, Opt. Express 19, 20003 (2011).

[5] F. Yang, S. Sukhishvili, H. Du and F. Tian, Sensors Actuators B: Chem. 253, 745 (2017).

[6] L. Wang, Y. Xu, Y. Geng, J. Wang, Y. Du, D. Yi, X. Hong and X. Li, J. Phys. D: Appl. Phys. 52, 495402 (2019).

[7] H. Zhang, X. Xu, H. Zhao, F. Dong, Z. Qian and B. J. A. S. Xue, Appl. Sci. 9, 5043 (2019).

[8] D. Vigneswaran, N. Ayyanar, M. Sharma, M. Sumathi, M. R. M.S and K. Porsezian, Sensors and Actuators A: Physical 269, 22 (2018).

[9] L. Yipeng, W. Jing, W. Shanshan, Y. Hongjuan and W. Xin, J. Lightwave Technol. 34, 5378 (2016).

[10] X. Limin, M. D. W. Grogan, W. J. Wadsworth, R. England and T. A. Birks, Opt. Express 19, 764 (2011).

[11] T. Limin, L. Jingyi and M. Eric, Opt. Express 12, 1025 (2004).

[12] P. Pavel, P. Alexander, N. Peyghambarian and M. Masud, Opt. Lett. 30, 1273 (2005).

[13] Y. Liao, J. Wang, H. Yang, X. Wang and S. Wang, Sensors and Actuators A: Physical 233, 22 (2015).

[14] L. P. Sun, J. Li, L. Jin, Y. Ran and B. O. Guan, Sensors And Actuators B-Chemical 231, 696 (2016).

[15] K. Wang, J. Zheng, H. Huang, Y. Chen, Y. Song, J. Ji and H. Zhang, Opt. Express 27, 16798 (2019).

[16] R. Wang, D. Li, H. Wu, M. Jiang, Z. Sun, Y. Tian, J. Bai and Z. J. I. P. J. Ren, IEEE Photonics Journal 9, 1 (2017).

[17] S. R. Azzuhri, I. S. Amiri, A. S. Zulkhairi, M. A. M. Salim, M. Z. A. Razak, M. F. Khyasudeen, H. Ahmad, R. Zakaria and P. J. R. i. P. Yupapin, Results in Physics 9, 1572 (2018).

[18] F. Chiavaioli, C. Trono and F. J. A. P. L. Baldini, Applied Physics Letters 102, 231109 (2013).

[19] X. Shu, Z. Lin and I. Bennion, Journal of Lightwave Technology 20, 255 (2002).

[20] Q. Xiaohong and S. F. Edward, Appl. Opt. 34, 3477 (1995).