TY - JOUR
T1 - Whispering gallery modes on optical micro-bottle resonator for humidity sensor application
AU - Md Johari, Md Ashadi
AU - Abdul Khudus, Muhammad Imran Mustafa
AU - Bin Jali, Mohd Hafiz
AU - Al Noman, Abdullah
AU - Harun, Sulaiman Wadi
N1 - Publisher Copyright:
© 2019 Elsevier GmbH
PY - 2019/5
Y1 - 2019/5
N2 - We investigate the use of a class of whispering gallery mode optical resonators, namely, optical microbottle resonators (MBR) as a relative humidity (RH) sensor. The MBR is fabricated via the so-called “soften-and-compress” method to create a bulge (bottle) structure with a bottle diameter D b =190μm, stem diameter of D s =125μm and bottle length of L b =182μm. The MBR is then optically excited by using a 2 μm optical microfiber and was found to have a Q-factor of >10 4 . The MBR was then employed as a humidity sensor with a RH range of between 40%–80% and the performance is compared with a no-MBR microfiber. The MBR RH sensor was found to have a sensitivity 0.0487 dB/%, linearity >90% and P-value >10 5 and is superior to the no-MBR microfiber in all measured parameters. The MBR RH sensor was also found to have good repeatability and stability over a period of 60 s. The wavelength shifted for the MBR is 0.03 nm greater than no-MBR.
AB - We investigate the use of a class of whispering gallery mode optical resonators, namely, optical microbottle resonators (MBR) as a relative humidity (RH) sensor. The MBR is fabricated via the so-called “soften-and-compress” method to create a bulge (bottle) structure with a bottle diameter D b =190μm, stem diameter of D s =125μm and bottle length of L b =182μm. The MBR is then optically excited by using a 2 μm optical microfiber and was found to have a Q-factor of >10 4 . The MBR was then employed as a humidity sensor with a RH range of between 40%–80% and the performance is compared with a no-MBR microfiber. The MBR RH sensor was found to have a sensitivity 0.0487 dB/%, linearity >90% and P-value >10 5 and is superior to the no-MBR microfiber in all measured parameters. The MBR RH sensor was also found to have good repeatability and stability over a period of 60 s. The wavelength shifted for the MBR is 0.03 nm greater than no-MBR.
KW - Humidity sensor
KW - Microfiber optic
KW - Optical Micro-resonator
UR - https://www.scopus.com/pages/publications/85063761338
U2 - 10.1016/j.ijleo.2019.03.111
DO - 10.1016/j.ijleo.2019.03.111
M3 - Article
AN - SCOPUS:85063761338
SN - 0030-4026
VL - 185
SP - 558
EP - 565
JO - Optik
JF - Optik
ER -