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Micro-ball and micro-bottle resonators for relative humidity sensing

U. U. M. ALI1, B. A. AHMAD2, M. A. M. JOHARI3, Z. JUSOH1, S. W. HARUN3,* , M. YASIN4,*

Affiliation

  1. Faculty of Electrical Engineering, Universiti Teknologi MARA(Terengganu), 23000 Dungun, Terengganu, Malaysia
  2. Communication Engineering Department, Al-Mamoon University College, 14th Ramadan Street, Baghdad, Iraq
  3. Photonics Engineering Laboratory, Department of Electrical Engineering, Faculty of Engineering, University of Malaya, Kuala Lumpur 50603, Malaysia
  4. Department of Physics, Faculty of Science and Technology, Airlangga University, Surabaya, Indonesia

Abstract

We compare the performance of two whispering gallery mode optical resonators; optical micro-ball (MBaR) and micro-bottle resonators (MBR) as a relative humidity (RH) sensor. The MBaR and MBR are fabricated via the so-called ``soften-and-compress" method to create a ball or bulge structure. The MBaR and MBR is then optically excited by using a 8μm optical microfiber and was found to have a Q-factor of >105. The MBaR and MBR was then employed as a humidity sensor with a RH range of between 40% to 100% and the performance is compared for both resonator. The MBR RH sensor was found to have a sensitivity of 0.2973 dB/%, linearity >90% and is superior to the MBaR microfiber in all measured parameters. The MBR RH sensor was also found to have good repeatability and stability compare to MBaR..

Keywords

Whispering gallery mode, Optical resonator, Humidity sensor.

Citation

U. U. M. ALI, B. A. AHMAD, M. A. M. JOHARI, Z. JUSOH, S. W. HARUN, M. YASIN, Micro-ball and micro-bottle resonators for relative humidity sensing, Optoelectronics and Advanced Materials - Rapid Communications, 13, 11-12, November-December 2019, pp.567-571 (2019).

Submitted at: Feb. 23, 2019

Accepted at: Dec. 10, 2019