Investigation of Surface Plasmon Resonance (SPR) in MoS2- and WS2-Protected Titanium Side-Polished Optical Fiber as a Humidity Sensor

被引:27
作者
Zakaria, Rozalina [1 ]
Zainuddin, Nur Aina'a Mardhiah [1 ]
Leong, Tan Chee [1 ]
Rosli, Rosnadiya [1 ]
Rusdi, Muhammad Farid [2 ]
Harun, Sulaiman Wadi [2 ]
Amiri, Iraj Sadegh [3 ,4 ]
机构
[1] Univ Malaya, Fac Sci, Photon Res Ctr, Kuala Lumpur 50603, Malaysia
[2] Univ Malaya, Fac Engn, Dept Elect Engn, Kuala Lumpur 50603, Malaysia
[3] Ton Duc Thang Univ, Adv Inst Mat Sci, Computat Opt Res Grp, Ho Chi Minh City 700000, Vietnam
[4] Ton Duc Thang Univ, Fac Appl Sci, Ho Chi Minh City 700000, Vietnam
关键词
side-polished fiber (SPF); molybdenum disulfide (MoS2); tungsten disulfide (WS2); SENSITIVITY; SILVER;
D O I
10.3390/mi10070465
中图分类号
O65 [分析化学];
学科分类号
070302 ; 081704 ;
摘要
In this paper, we report the effects of a side-polished fiber (SPF) coated with titanium (Ti) films in different thicknesses, namely 5 nm, 13 nm, and 36 nm, protected by a thin layer of transition metal dichalcogenides (TMDCs) such as molybdenum disulfide (MoS2) and tungsten disulfide (WS2), which provide ultra-sensitive sensor-based surface plasmon resonance (SPR) covering from the visible to mid-infrared region. The SPF deposited with Ti exhibits strong evanescent field interaction with the MoS2 and WS2, and good optical absorption, hence resulting in high-sensitivity performance. Incremental increases in the thickness of the Ti layer contribute to the enhancement of the intensity of transmission with redshift and broad spectra. The findings show that the optimum thickness of Ti with 36 nm combined with MoS2 causes weak redshifts of the longitudinal localized surface plasmon resonance (LSPR) mode, while the same thickness of Ti with WS2 causes large blueshifts. The redshifts are possibly due to a reduced plasmon-coupling effect with the excitonic region of MoS2. The observed blueshifts of the LSPR peak position are possibly due to surface modification between WS2 and Ti. Changing the relative humidity from 58% to 88% only elicited a response in Ti/MoS2. Thus, MoS2 shows more sensitivity on 36-nm thickness of Ti compared with WS2. Therefore, the proposed fiber-optic sensor with integration of 2D materials is capable of measuring humidity in any environment.
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页数:10
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