Sensitivity-enhanced surface plasmon resonance sensor utilizing a tungsten disulfide (WS<sub>2</sub>) nanosheets overlayer

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

doi:10.1364/prj.6.000485

Cited by 91 publications

(31 citation statements)

References 30 publications

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“…One of the most effective ways for improving the efficiency of sensing devices is to select a material, such as graphene, to optimize sensing functions [7][8][9][10]. The significant properties of transition metal dichalcogenide (TMDC) materials, such as their absorption rate (~5%), which is higher compared to a graphene monolayer (2.3%), entirely different large tunable band gap than the zero band gap of graphene, and large biosense work function in comparison to graphene, are increasingly becoming preferred in biosensing applications.…”

Section: Introductionmentioning

confidence: 99%

Sensitivity Enhancement of a Surface Plasmon Resonance Sensor with Platinum Diselenide

Jia

Wang

et al. 2019

Sensors

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The extraordinary optoelectronic properties of platinum diselenide (PtSe2), whose structure is similar to graphene and phosphorene, has attracted great attention in new rapidly developed two-dimensional (2D) materials beyond the other 2D material family members. We have investigated the surface plasmon resonance (SPR) sensors through PtSe2 with the transfer matrix method. The simulation results show that the anticipated PtSe2 biochemical sensors have the ability to detect analytic. It is evident that only the sensitivities of Ag or Au film biochemical sensors were observed at 118°/RIU (refractive index unit) and 130°/RIU, whereas the sensitivities of the PtSe2-based biochemical sensors reached as high as 162°/RIU (Ag film) and 165°/RIU (Au film). The diverse biosensor sensitivities with PtSe2 suggest that this kind of 2D material can adapt SPR sensor properties.

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Section: Introductionmentioning

confidence: 99%

Sensitivity Enhancement of a Surface Plasmon Resonance Sensor with Platinum Diselenide

Jia

Wang

et al. 2019

Sensors

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“…Benefiting from these advantages, TMDCs offer a unique platform for investigation of intriguing light-matter interactions at the nanoscale through, besides the well-known van der Waals heterostructures 12,13 , the integration with artificial materials, such as photonic nanocavities 14,15 , plasmonic nanostructures 16 , and single nanoparticle antennas 17 . This enables the establishment of compact optoelectronic devices, including tunable light emitters 18 , nanolasers 19,20 , electro-optic modulator 21 , optical switches 22 , biosensors/detectors 23,24 , fieldeffect transistors 25 , quantum devices 26 , etc., which are the key elements of the next-generation integrated photonic circuits. Recently, TMDCs implemented in plasmon-exciton hybrid systems have been intensively explored, such as giant Rabi splitting 27,28 , multifold enhancement in PL 29,30 and active control of plasmon-exciton coupling 31,32 in various noble metal-TMDC hybrid nanostructures.…”

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confidence: 99%

Polarized resonant emission of monolayer WS2 coupled with plasmonic sawtooth nanoslit array

Han

2020

Nat Commun

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Transition metal dichalcogenide (TMDC) monolayers have enabled important applications in light emitting devices and integrated nanophotonics because of the direct bandgap, spinvalley locking and highly tunable excitonic properties. Nevertheless, the photoluminescence polarization is almost random at room temperature due to the valley decoherence. Here, we show the room temperature control of the polarization states of the excitonic emission by integrating WS 2 monolayers with a delicately designed metasurface, i.e. a silver sawtooth nanoslit array. The random polarization is transformed to linear when WS 2 excitons couple with the anisotropic resonant transmission modes that arise from the surface plasmon resonance in the metallic nanostructure. The coupling is found to enhance the valley coherence that contributes to~30% of the total linear dichroism. Further modulating the transmission modes by optimizing metasurfaces, the total linear dichroism of the plasmonexciton hybrid system can approach 80%, which prompts the development of photonic devices based on TMDCs.

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“…Consequently, the analyte solution will fill the hollowness, which enables us to consider the MoS 2 overlayer and analyte solution together as a hybrid dielectric. The effective RI of the hybrid dielectric n eff can be described as

n_{eff} = n_{{MoS}_{normal2}} \times f_{{MoS}_{normal2}} + n_{sol} \times f_{sol}

where n MoS2 and n sol are the refractive indices of MoS 2 and the analyte solution, respectively; f MoS2 and f sol are the corresponding occupation ratios in volume, and f MoS2 + f sol = 1. Here, the RI of the monolayer MoS 2 is regarded as the value of n MoS2 , and n sol is set as 1.333.…”

Section: Simulation and Analysismentioning

confidence: 99%

MoS₂ Nanosheets Modified Surface Plasmon Resonance Sensors for Sensitivity Enhancement

Chen

Wang

et al. 2019

Advanced Optical Materials

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when compared with graphene: singlelayer MoS 2 exhibits a direct electronic bandgap of ≈1.8 eV and optical absorption rate of ≈5%, which is quite different with the zero bandgap and ≈2.3% absorption rate for monolayer graphene. [3] The synthesis of 2D MoS 2 can be classified into top-down method (mechanical exfoliation, liquid exfoliation, electrochemical exfoliation, etc.) and down-top method (the chemical vapor deposition growth). [4] Particularly, the intriguing optical properties, including f luorescence quenching and photoluminescence abilities, enable MoS 2 to play an important role in the optical biosensing field. [5] For example, a fluorescence quenching system of aptamer-CdTequantum dots (QDs)-MoS 2 nanosheets has been developed to detect ochratoxin A (OTA, a typical mycotoxin). [6] The originally fluorescence-quenched QDs-conjugated aptamers, which are assembled on MoS 2 , again exhibit fluorescence in the presence of OTA, and the intensity is dependent on the concentration of OTA. A detection limit of 1.0 ng mL −1 and a dynamic range over 1.0-1000 ng mL −1 were obtained. On the other hand, based on the photoluminescence property of MoS 2 and the fact that its intensity is influenced by the extrinsic charge doping, a graphene/MoS 2 heterostructure has been proposed for ultrasensitive detection of DNA hybridization (as low as 1 × 10 −18 m).[7] However, the both sensing schematics mentioned above lack the ability of label-free or real-time detection, limiting the applications of MoS 2 in the field of optical sensing.As a label-free and real-time optical sensing technology, surface plasmon resonance (SPR) sensing has attracted tremendous researches, and seen spectacular progresses over the past Benefiting from the unique properties of MoS 2 nanosheets including high electron mobility, quantum confinement, nanoscale thickness, etc., an effective way is proposed and demonstrated to enhance the refractive index sensitivity of surface plasmon resonance (SPR) sensors, which is strongly desired all the time in the field of biochemical sensing. The SPR sensors are modified by the physical deposition of MoS 2 nanosheets, and the sensitivity dependence on the number of deposition cycles is investigated experimentally. It is found that the sensitivity first increases and then declines with the increase of the number of deposition cycles, meaning an optimal thickness thus existing. By depositing MoS 2 nanosheets for two cycles, the maximal sensitivity of 2793.5 nm RIU −1 (RIU: refractive index unit) can be achieved, which shows an enhancement of 30.67% compared with the case without any modification. Taking into account the evanescent field intensity and the propagation length, the experimental results can be well analyzed and explained. Simulation results show that the increase of MoS 2 overlayers can enhance the intensity of electrical field penetrating into the analyte solution while reducing the propagation length, which collectively results in the nonmonotonic change of the sensitivity depending on deposition cy...

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

Cited by 91 publications

References 30 publications

Sensitivity Enhancement of a Surface Plasmon Resonance Sensor with Platinum Diselenide

Sensitivity Enhancement of a Surface Plasmon Resonance Sensor with Platinum Diselenide

Polarized resonant emission of monolayer WS2 coupled with plasmonic sawtooth nanoslit array

MoS₂ Nanosheets Modified Surface Plasmon Resonance Sensors for Sensitivity Enhancement

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

Cited by 91 publications

References 30 publications

Sensitivity Enhancement of a Surface Plasmon Resonance Sensor with Platinum Diselenide

Sensitivity Enhancement of a Surface Plasmon Resonance Sensor with Platinum Diselenide

Polarized resonant emission of monolayer WS2 coupled with plasmonic sawtooth nanoslit array

MoS2 Nanosheets Modified Surface Plasmon Resonance Sensors for Sensitivity Enhancement

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

MoS₂ Nanosheets Modified Surface Plasmon Resonance Sensors for Sensitivity Enhancement