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Coatings 2019, 9(2), 144;

A Single-Ended Ultra-Thin Spherical Microbubble Based on the Improved Critical-State Pressure-Assisted Arc Discharge Method

School of Equipment Engineering, Shenyang Ligong University, Shenyang 110159, China
College of Information and Communication Engineering, North University of China, Taiyuan 030051, China
Collage of Information Science & Technology, Hainan University, Haikou 570228, China
Hainan Science & Technology Department, Haikou 570228, China
School of Optoelectronic Science and Engineering, University of Electronic Science and Technology of China, Chengdu 611731, China
Authors to whom correspondence should be addressed.
These authors contributed equally to this work.
Received: 29 January 2019 / Revised: 17 February 2019 / Accepted: 19 February 2019 / Published: 22 February 2019
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Hollow core microbubble structures are good candidates for the construction of high performance whispering gallery microresonator and Fabry-Perot (FP) interference devices. In the previous reports, most of interest was just focused on the dual-ended microbubble, but not single-ended microbubble, which could be used for tip sensing or other special areas. The thickness, symmetry and uniformity of the single-ended microbubble in previous reports were far from idealization. Thus, a new ultra-thin single-ended spherical microbubble based on the improved critical-state pressure-assisted arc discharge method was proposed and fabricated firstly in this paper, which was fabricated simply by using a commercial fusion splicer. The improvement to former paper was using weak discharge and releasing pressure gradually during the discharging process. Thus, the negative influence of gravity towards bubble deformation was decreased, and the fabricated microbubble structure had a thin, smooth and uniform surface. By changing the arc discharge parameters and the fiber position, the wall thicknesses of the fabricated microbubble could reach the level of 2 μm or less. The fiber Fabry-Perot (FP) interference technique was also used to analyze the deformation characteristic of microbubble under difference filling pressures. Finding the ends of the microbubbles had a trend of elongation with axial compression when the filling pressure was increasing. Its sensitivity to the inner pressure of microbubble samples was about ~556 nm/MPa, the bubble wall thickness was only of about 2 μm. Besides, a high whispering gallery mode (WGM) quality factor that up to 107 was realized by using this microbubble-based resonator. To explain the upper phenomenon, the microbubble was modeled and simulated with the ANSYS software. Results of this study could be useful for developing new single-ended whispering gallery mode micro-cavity structure, pressure sensors, etc. View Full-Text
Keywords: fiber optics sensor; Fabry-Perot; whispering gallery mode; microresonator fiber optics sensor; Fabry-Perot; whispering gallery mode; microresonator

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Guo, W.; Liu, J.; Liu, J.; Wang, G.; Wang, G.; Huang, M. A Single-Ended Ultra-Thin Spherical Microbubble Based on the Improved Critical-State Pressure-Assisted Arc Discharge Method. Coatings 2019, 9, 144.

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