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It is found that two walls of fiber micro-cavity fabricated by femtosecond laser micromachining are not perpendicular to the fiber axis. Interference spectrum of the unparallel wall fiber micro-cavity Mach-Zehnder interferometer (MZI) shows abnormal characteristics, such as optical path difference decreasing linearly with wavelength increasing and the total loss decreasing with wavelength increasing. In this regard, we propose an unparalleled wall fiber micro-cavity MZI model and establish analytical theory. By using new models and theories, the new micro-cavity interferometer characteristics are studied, including that the effects of corner and depth on spectral peak wavelength are numerically analysed and transmission loss, absorption loss, insertion loss, infrared absorption loss of material as well as how they affect the interference fringe contrast are theoretically studied. Theoretical analyses and experimental results are in agreement with each other. For fluid sensing, a high-quality unparallel wall fiber micro-cavity MZI is fabricated. The interference fringe contrast of the fiber micro-cavity reaches up to 35 dB in water. Experimental results show that the sensor exhibits an ultrahigh RI sensitivities, as high as——12937.31 nm/RIU in aqueous solution of sucrose.
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Keywords:
- fiber Mach-Zehnder interferometer /
- unparallel wall fiber micro-cavity /
- femtosecond laser micromachining /
- fluid sensing
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[2] Shin W, Lee Y L, Yu B A, Noh Y C, Ahn T J 2010 Opt. Commun. 283 2097
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[9] Gouveia C, Jorge A S P, Baptista M J, Frazâo O 2011 IEEE Photon. Technol. Lett. 23 804
[10] Feng S C, Li H L, Xu O, Lu S H, Jian S S 2009 Communications and Photonics Conference and Exhibition (ACP) China Nov. 2-6, 2009
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[12] Duan D, Rao Y, Xu L, Zhu T, Deng M, Wu D, Yao J 2011 Opt. Commun. 284 5311
[13] Wang Y, Yang M, Wang D N, Liu S, Lu P 2010 J. Opt. Soc. Am. B 27 370
[14] Jiang L, Zhao L, Jiang L, Wang S, Yang J, Xiao H 2011 Opt. Express 19 17591
[15] Zhang W G, Liu Z L, Yin L M 2011 Acta Optica Sinica 31 0706007-1 (in Chinese) [张伟刚, 刘卓琳, 殷丽梅 2011 光学学报 31 0706007-1]
[16] Younkin R, Carey E J, Mazur E, Levinson A J, Friend M C 2003 Appl. Phys. 93 2626
[17] Peng Y, Wen Y, Zhang D, Luo S, Chen L, Zhu Y 2011 Appl. Opt. 50 4765
[18] Shi S X, Zhang H X, Liu J S 2006 Physical Opt. and Appl. Opt. (Xi'an: University of Electronic Science and Technology Press) p289 (in Chinese) [石顺祥, 张海兴, 刘劲松 2006 物理光学与应用光学 (西安:电子科技大学出版) 第289页]
[19] Ding Z K, Xu J S, Song N 2009 Information Technol. 7 66 (in Chinese) [丁兆昆, 徐俊山, 宋宁 2009 信息技术 7 66]
[20] Marcuse D 1977 Bell Syst. Tech. J. 56 70
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[1] Lim J H, Jang H S, Lee K S 2004 Opt. Lett. 29 346
[2] Shin W, Lee Y L, Yu B A, Noh Y C, Ahn T J 2010 Opt. Commun. 283 2097
[3] Fan Y, Zhu T, Shi L, Rao Y 2011 Appl. Opt. 50 4604
[4] Wei T, Lan X W, Xiao H 2009 IEEE Photon. Technol. Lett. 21 669
[5] Lu P, Men L, Sooley K, Chen Q 2009 Appl. Phys. Lett. 94 131110
[6] Li Y, Chen L, Harris E, Bao X 2010 IEEE Photon. Technol. Lett. 22 1750
[7] Monzon-Hernandez D, Martinez-Rios A, Torres-Gomez I, Salceda-Delgado D 2011 Opt. Lett. 36 4380
[8] Hou J P, Ning T, Gai S L, Li P, Hao J P, Zhao J L 2010 Acta Phys. Sin. 59 4732 (in Chinese) [侯建平, 宁韬, 盖双龙, 李鹏, 郝建平, 赵建林 2010 59 4732]
[9] Gouveia C, Jorge A S P, Baptista M J, Frazâo O 2011 IEEE Photon. Technol. Lett. 23 804
[10] Feng S C, Li H L, Xu O, Lu S H, Jian S S 2009 Communications and Photonics Conference and Exhibition (ACP) China Nov. 2-6, 2009
[11] Li Q, Lin C H, Tseng P Y, Lee H P 2005 Opt. Commun. 250 280
[12] Duan D, Rao Y, Xu L, Zhu T, Deng M, Wu D, Yao J 2011 Opt. Commun. 284 5311
[13] Wang Y, Yang M, Wang D N, Liu S, Lu P 2010 J. Opt. Soc. Am. B 27 370
[14] Jiang L, Zhao L, Jiang L, Wang S, Yang J, Xiao H 2011 Opt. Express 19 17591
[15] Zhang W G, Liu Z L, Yin L M 2011 Acta Optica Sinica 31 0706007-1 (in Chinese) [张伟刚, 刘卓琳, 殷丽梅 2011 光学学报 31 0706007-1]
[16] Younkin R, Carey E J, Mazur E, Levinson A J, Friend M C 2003 Appl. Phys. 93 2626
[17] Peng Y, Wen Y, Zhang D, Luo S, Chen L, Zhu Y 2011 Appl. Opt. 50 4765
[18] Shi S X, Zhang H X, Liu J S 2006 Physical Opt. and Appl. Opt. (Xi'an: University of Electronic Science and Technology Press) p289 (in Chinese) [石顺祥, 张海兴, 刘劲松 2006 物理光学与应用光学 (西安:电子科技大学出版) 第289页]
[19] Ding Z K, Xu J S, Song N 2009 Information Technol. 7 66 (in Chinese) [丁兆昆, 徐俊山, 宋宁 2009 信息技术 7 66]
[20] Marcuse D 1977 Bell Syst. Tech. J. 56 70
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