研究目的
To investigate the effects of a side-polished fiber (SPF) coated with titanium (Ti) films in different thicknesses, protected by a thin layer of transition metal dichalcogenides (TMDCs) such as molybdenum disulfide (MoS2) and tungsten disulfide (WS2), for ultra-sensitive sensor-based surface plasmon resonance (SPR) covering from the visible to mid-infrared region.
研究成果
The 36-nm thickness of Ti was found to be optimal for SPR-based humidity sensing when combined with MoS2, showing sensitivity to changes in relative humidity from 58% to 88%. MoS2 demonstrated higher sensitivity compared to WS2 under the same conditions. The study highlights the potential of integrating 2D materials with optical fibers for environmental sensing applications.
研究不足
The study was limited to specific thicknesses of Ti films (5 nm, 13 nm, and 36 nm) and a fixed volume (0.2 mL) of MoS2 and WS2. The sensitivity of the sensor was only tested up to 88% relative humidity.
1：Experimental Design and Method Selection:
The study involved coating side-polished fibers with titanium films of varying thicknesses (5 nm, 13 nm, and 36 nm) and protecting them with MoS2 and WS2 layers to investigate SPR effects.
2：Sample Selection and Data Sources:
Single-mode fibers (SMF) with a core/cladding diameter of 9/125 μm were used, polished to create a flat transition region for evanescent field interaction.
3：List of Experimental Equipment and Materials:
Equipment included an electron beam evaporation machine for Ti deposition, a broadband light source (900 nm to 1500 nm), and an ocean optic spectrometer for transmission spectra measurement.
4：Experimental Procedures and Operational Workflow:
The polished fibers were coated with Ti, followed by drop casting of MoS2 and WS
5：The sensitivity was tested under varying relative humidity conditions. Data Analysis Methods:
Transmission spectra were analyzed to observe shifts in SPR peaks under different humidity levels.
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