Effect of oxygen plasma modification on refractive index sensing with micro-cavity in-line Mach-Zehnder interferometer
Anna Dębowska , Magdalena Dominik , Marcin Koba , Monika Janik , Wojtek J. Bock , Mateusz Jakub Śmietana
AbstractA micro-cavity in-line Mach-Zehnder interferometer (μIMZI) is an optical sensing structure fabricated in an optical fiber. Its design allows for refractive index sensing of liquid and gas in picoliter volumes, making it suitable for biochemical and medical sensing where measured material is often scarce. The fabricated structures show satisfactory levels of sensitivity, from about 400 nm/RIU in the near-water range of solutions (nD 1.336±0.003 RIU) to about 16 000 nm/RIU for solutions in approximate range from nD = 1.35 RIU to nD = 1.4 RIU. The structures were subjected to oxygen plasma, the process which was supposed to modify physical parameters of the structures, i.e., cavity surface wettability and roughness, and in consequence their sensitivity. As a result of the oxygen plasma modification we have observed a improved wettability of the structure surface, what makes it easier to introduce liquid into the cavity and simplifies the measurement process. In the case where the plasma processing is preceded by biological layer deposition, the bottom surface of the structure is smoothed and slightly deepened, causing a shift in the transmission spectrum and change in sensitivity.
|Publication size in sheets||0.5|
|Book||Swatowska Barbara, Maziarz Wojciech, Pisarkiewicz Tadeusz, Kucewicz Wojciech (eds.): Proceedings of SPIE Electron Technology Conference 2016, vol. 1, no. 10175, 2016, SPIE, ISBN 9781510608436, 354 p., DOI:10.1117/12.2270351|
|Keywords in English||Oxygen; Plasmas; Refractive index; Mach-Zehnder interferometer; Optical fibers; Optical sensing; Water|
|Score|| = 15.0, 27-03-2017, BookChapterMatConfByIndicator|
= 15.0, 27-03-2017, BookChapterMatConfByIndicator
|Citation count*||1 (2018-02-20)|
* presented citation count is obtained through Internet information analysis and it is close to the number calculated by the Publish or Perish system.