Yin Li-Mei, Zhang Wei-Gang, Xue Xiao-Lin, Bai Zhi-Yong, Wei Shi-Lei. Study on characteristics and fluid sensing of unparallel wall fiber micro-cavity Mach-Zehnder interferometer fabricated by femtosecond laser micromachiningJ. Acta Physica Sinica, 2012, 61(17): 170701. DOI: 10.7498/aps.61.170701