Fast detection of humidity with a subwavelength-diameter fiber taper coated with gelatin film

Optics Express
Lei ZhangLimin Tong

Abstract

A subwavelength-diameter tapered optical fiber coated with gelatin layer for fast relative humidity (RH) sensing is reported. The sensing element is composed of a 680-nm-diameter fiber taper coated with a 80-nm-thickness 8-mm-length gelatin layer, and is operated at a wavelength of 1550 nm. When exposed to moisture, the change in refractive index of the gelatin layer changes the mode field of the guided mode of the coated fiber, and converts a portion of power from guided mode to radiation mode, resulting in RH-dependent loss for optical sensing. The sensor is operated within a wide humidity range (9-94% RH) with high sensitivity and good reversibility. Measured response time is about 70 ms, which is one or two orders of magnitude faster than other types of RH sensors relying on conventional optical fibers or films.

References

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Citations

Mar 1, 2014·Sensors·Stanislav A KolpakovKaiming Zhou
Mar 29, 2014·Sensors·Jingyi LouLimin Tong
Jan 7, 2017·Journal of the Optical Society of America. A, Optics, Image Science, and Vision·Saba N Khan, Partha Roy Chaudhuri
Jun 2, 2018·Small·Yun PengFeng Xia
Oct 14, 2010·Optics Express·Mohammad BelalTrevor Newson
Dec 18, 2010·Optics Express·Ariane StiebeinerArno Rauschenbeutel
Jun 1, 2013·Optics Letters·Fuxing GuSonglin Zhuang
Sep 29, 2011·Lab on a Chip·Lei ZhangLimin Tong
Jul 15, 2016·Applied Optics·Sudip K Chatterjee, Partha Roy Chaudhuri
Nov 17, 2011·Applied Optics·Pan WangLimin Tong
Feb 18, 2010·Optics Letters·Na LouValerio Pruneri
Jul 5, 2012·Advanced Materials·Jian Yao ZhengJiannian Yao
Sep 18, 2010·Optics Letters·M BelalT P Newson
Nov 18, 2014·Optics Express·Ryutaro Nagai, Takao Aoki
Nov 10, 2016·Applied Optics·Haifa Alali, Chuji Wang
Dec 11, 2013·Optics Letters·Pengfei WangGilberto Brambilla
Jan 31, 2019·Optics Express·Hironaga MaruyaShigeki Takeuchi

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