Sensitivity-Enhanced SPR Sensor Based on Graphene and Subwavelength Silver Gratings

Kong, Lu; Lv, Jiangtao; Gu, Qiang; Ying, Yu; Jiang, Xiaoxiao; Si, Guangyuan

doi:10.3390/nano10112125

Cited by 29 publications

(10 citation statements)

References 50 publications

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“…Regarding the type of cover, the inner film was gold or silver. The thickness of the deposited bimetallic layers was considered from the existing literature [ 35 ] for gold layers and [ 36 , 37 ] for silver layers. Based on the previous works, the total thickness of the bimetallic layers was estimated as h = 10 nm, and the contribution of the individual metals was 50% because the probes that the multilayer covers work better with thinner silver layers [ 38 ].…”

Section: Methodsmentioning

confidence: 99%

SPR Sensor Based on a Tapered Optical Fiber with a Low Refractive Index Liquid Crystal Cladding and Bimetallic Ag–Au Layers

Korec

Stasiewicz

Jaroszewicz

2022

Sensors

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This paper presents a study of the influence of bimetallic layer covers of a tapered optical fiber surrounded by a low refractive index liquid crystal on the properties of light propagation in the taper structure. This research follows previous works on the effect of monometallic thin films (Au and Ag). In this case, the total thicknesses of the bimetallic layers were h = 10 nm, and the participation of gold and silver was equal. The films were deposited on one side of the tapered waist area. The liquid crystal cells were controlled with a voltage U from 0 to 200 V, with and without amplitude modulation at a frequency of fmod = 5 Hz. For the purposes of this research, spectral characteristics were obtained for a wavelength λ ranging from 550 to 1200 nm. Measurements were carried out at room temperature for three types of rubbed layers orientation—orthogonal, parallel, and twist in relation to the fiber axis. Obtained resonant peaks were compared with the previous results regarding the resonant wavelength, peak width, SNR, and maximum absorption. In the presented paper, the novelty is mainly focused on the materials used and their time stability, as well as corresponding changes in the technological parameters used.

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Section: Methodsmentioning

confidence: 99%

SPR Sensor Based on a Tapered Optical Fiber with a Low Refractive Index Liquid Crystal Cladding and Bimetallic Ag–Au Layers

Korec

Stasiewicz

Jaroszewicz

2022

Sensors

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“…The thickness of these layers is 𝑑 4 . The single layer thickness of graphene is 0.34 nm [24]. Thus, 𝑑 4 can be expressed as 𝑑 4 = 𝐿 × 0.34 𝑛𝑚, where 𝐿 is the number of graphene layers.…”

Section: Structure Design and Modelingmentioning

confidence: 99%

“…In the previous work [23], the performance of the fundamental linear polarized (LP01) mode in optical fiber SPR sensor has been studied for different operating wavelengths, where the study was related only to single-mode fiber. In this paper, the performance of guided modes in SPR sensor is examined for some selected few-mode fibers, which are an ideal compromise between singlemode and multimode fibers [24]. The study is applied on a D-shaped sensor structure with graphene layer due to its superior performance as mentioned earlier.…”

Section: Introductionmentioning

confidence: 99%

Few-mode optical fiber surface plasmon resonance sensor with controllable range of measured refractive index

Shehab

Salah²,

Al-Sawalmeh³

et al. 2023

IJECE

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A few-mode optical fiber surface plasmon resonance sensor with graphene layer is investigated, firstly, with the aim of studying the behavior of the guided modes and, secondly, with the aim of determining the range of the measured refractive index for some selected few-mode fibers. The results show that as the number of modes propagated in the fiber increases, the maximum sensitivity of a particular mode decreases while the range of the measured refractive index of that mode increases. Also, it is shown that the range can be easily tuned with sensitivity consideration by only adjusting the operating wavelength without any modification of the sensor, which is desirable from practical point of view. In addition, it is shown that the core diameter of the fiber should be chosen according to sensitivity and range needing, where a compromise between them must be found. The study presented in this paper can significantly help in developing new sensing techniques, such as multi-parameter sensing, by monitoring the various responses of the modes. Also, it can be used to customize the sensor for specific sensing applications in various fields, especially to measure refractive indices in subranges of 1.38 to 1.46.

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“…Also, they study the influence of the number of graphene layers on sensitivity. As a result, the designed sensor's maximum sensitivity reached 192 deg/refractive index unit (RIU) [27].…”

Section: Introductionmentioning

confidence: 99%

Theory and Modeling of Slab Waveguide Based Surface Plasmon Resonance

Hasan¹,

Al-Azawi²,

Alwahib³

2022

ETJ

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Sensitivity-Enhanced SPR Sensor Based on Graphene and Subwavelength Silver Gratings

Cited by 29 publications

References 50 publications

SPR Sensor Based on a Tapered Optical Fiber with a Low Refractive Index Liquid Crystal Cladding and Bimetallic Ag–Au Layers

SPR Sensor Based on a Tapered Optical Fiber with a Low Refractive Index Liquid Crystal Cladding and Bimetallic Ag–Au Layers

Few-mode optical fiber surface plasmon resonance sensor with controllable range of measured refractive index

Theory and Modeling of Slab Waveguide Based Surface Plasmon Resonance

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