Sensitivity-enhanced surface plasmon resonance sensor utilizing a tungsten disulfide (WS2) nanosheets overlayer

Hao Wang; Hui Zhang; Jiangli Dong; Shiqi Hu; Wenguo Zhu; Wentao Qiu; Huihui Lu; Jianhui Yu; Heyuan Guan; Shecheng Gao; Zhaohui Li; Weiping Liu; Miao He; Jun Zhang; Zhe Chen; Yunhan Luo

doi:10.1364/PRJ.6.000485

Journals >Photonics Research >Volume 6 >Issue 6 >Page 485 > Article

Photonics Research
Vol. 6, Issue 6, 485 (2018)

Sensitivity-enhanced surface plasmon resonance sensor utilizing a tungsten disulfide (WS₂) nanosheets overlayer

Hao Wang^1、†, Hui Zhang^1、4、†, Jiangli Dong^1、2, Shiqi Hu¹, Wenguo Zhu³, Wentao Qiu³, Huihui Lu¹, Jianhui Yu^1、3, Heyuan Guan^1、3, Shecheng Gao², Zhaohui Li^1、5, Weiping Liu², Miao He⁴, Jun Zhang¹, Zhe Chen^1、3, and Yunhan Luo^{1、2、3、*}

Author Affiliations

¹Guangdong Provincial Key Laboratory of Optical Fiber Sensing and Communications, Jinan University, Guangzhou 510632, China

²Key Laboratory of Optoelectronic Information and Sensing Technologies of Guangdong Higher Education Institutes, Jinan University, Guangzhou 510632, China

³Key Laboratory of Visible Light Communications of Guangzhou, Jinan University, Guangzhou 510632, China

⁴School of Physics and Optoelectronic Engineering, Guangdong University of Technology, Guangzhou 510006, China

⁵State Key Laboratory of Optoelectronic Materials and Technologies and School of Electronics and Information Technology, Sun Yat-sen University, Guangzhou 510275, China

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DOI: 10.1364/PRJ.6.000485 Cite this Article Set citation alerts

Hao Wang, Hui Zhang, Jiangli Dong, Shiqi Hu, Wenguo Zhu, Wentao Qiu, Huihui Lu, Jianhui Yu, Heyuan Guan, Shecheng Gao, Zhaohui Li, Weiping Liu, Miao He, Jun Zhang, Zhe Chen, Yunhan Luo. Sensitivity-enhanced surface plasmon resonance sensor utilizing a tungsten disulfide (WS₂) nanosheets overlayer[J]. Photonics Research, 2018, 6(6): 485 Copy Citation Text

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Fig. 1. Raman spectrum of the WS2 layers on the SPR sensor structure.

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(a) WS2 surface morphology image of the SPR sensor. The WS2 cross section SEM images after different numbers of times of repeated post-coating: (b) one; (c) two; (d) three; (e) four; (f) five.

Fig. 2. (a) WS2 surface morphology image of the SPR sensor. The WS2 cross section SEM images after different numbers of times of repeated post-coating: (b) one; (c) two; (d) three; (e) four; (f) five.

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Fig. 3. Experimental setup for RI sensing measurement.

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$Reflectance spectra of the WS2-SPR sensors corresponding to different post-coating times: (a) Without coating; (b) one; (c) two; (d) three; (e) four; (f) five. The refractive index of the sensing analyte changes from 1.333 to 1.360.$

Fig. 4. Reflectance spectra of the WS2-SPR sensors corresponding to different post-coating times: (a) Without coating; (b) one; (c) two; (d) three; (e) four; (f) five. The refractive index of the sensing analyte changes from 1.333 to 1.360.

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$Experimental variation of shift in the resonance wavelength with refractive index under different times of WS2 nanosheet post-coating: (a) Without coating; (b) one; (c) two; (d) three; (e) four; (f) five.$

Fig. 5. Experimental variation of shift in the resonance wavelength with refractive index under different times of WS2 nanosheet post-coating: (a) Without coating; (b) one; (c) two; (d) three; (e) four; (f) five.

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Fig. 6. (a) Sensitivity and (b) figure of merit comparison for different number of times of WS2 nanosheets coatings.

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$(a) Experimental variation of shift in the resonance wavelength with surrounding refractive index ranging from 1.333 to 1.40. (b) Evanescent electric field distribution at the resonance wavelength within the prism/gold film (50 nm)/analyte (n=1.36) structure.$

Fig. 7. (a) Experimental variation of shift in the resonance wavelength with surrounding refractive index ranging from 1.333 to 1.40. (b) Evanescent electric field distribution at the resonance wavelength within the prism/gold film (50 nm)/analyte (n=1.36) structure.

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