Abstract
Tungsten disulphide (WS2) is a two-dimensional transition-metal dichalcogenide material that can be used to improve the sensitivity of a variety of sensing applications. This study investigated the effect of WS2 coating on tapered region microfiber (MF) for relative humidity (RH) sensing applications. The flame brushing technique was used to taper the standard single-mode fiber (SMF) into three different waist diameter sizes of MF 2, 5, and 10 µm, respectively. The MFs were then coated with WS2 via a facile deposition method called the drop-casting technique. Since the MF had a strong evanescent field that allowed fast near-field interaction between the guided light and the environment, depositing WS2 onto the tapered region produced high humidity sensor sensitivity. The experiments were repeated three times to measure the average transmitted power, presenting repeatability and sensing stability. Each MF sample size was tested with varying humidity levels. Furthermore, the coated and non-coated MF performances were compared in the RH range of 45–90% RH at room temperature. It was found that the WS2 coating on 2 µm MF had a high sensitivity of 0.0861 dB/% RH with linearity over 99%. Thus, MF coated with WS2 encourages enhancement in the evanescent field effect in optical fiber humidity sensor applications.
Highlights
MF is the best choice in optical sensing applications based on the principle of the evanescent field, where strong interactions occur between the MF medium and its surroundings
MFs, i.e., 2, 5, to and μm, were placed inside the sealed chamber, whose ends were connected to the tunable tunable laser source (TLS)the and to thechamber, optical power
MFsensing was formed with three diameter sizes, with i.e., 2, 5, and 10 μm, using flame brushing developed in-house.sizes, The tivity changing
Summary
MF is the best choice in optical sensing applications based on the principle of the evanescent field, where strong interactions occur between the MF medium and its surroundings This principle has been a significant advantage of MF, potentially being used in a limited area with high performances. A resonator is an advanced structure based on a closed-loop configuration that uses a large evanescent field created from self-coupling light and overlapping condition This configuration enables the evanescent field to interact with the surrounding environment of the sensing region. Before that, using the flame brushing technique, we managed to form three sizes of tapered fiber region, i.e., 2, 5, and 10 μm These MFs were coated with WS2 and tested in humidity ranging from 45% to 90% for sensing purposes. The performances of coated MFs for the different tapered region in humidity sensing were evaluated and compared
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