Metal Nanowire Assisted Hollow Core Fiber Sensor for an Efficient Detection of Small Refractive Index Change of Measurand Liquid

Pathak, Akhilesh Kumar; Ghosh, Souvik; Gangwar, Rahul Kumar; Rahman, B. M. A.; Singh, Vinod Kumar

doi:10.1007/s11468-019-00969-y

Cited by 39 publications

(10 citation statements)

References 23 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…From the figure, we can clearly observe a good linearity of R 2 = 0.99 for the n a varying between 1.33 to 1.38. The wavelength sensitivity (S λ ) of the designed sensor can be calculated by the following equation [25]:S λ = Δλ peak /Δn a (nm/RIU) where Δλ peak shows the change in resonance wavelength and Δn a represents the change in analytes refractive index. The CSRIS covered with Au film results in an average sensitivity of 808.57 nm/RIU, which is enhanced five times by using AuNWs in the same CSC and achieve a high sensitivity of 4471 nm/RIU for RI varying between 1.33 and 1.38.…”

Section: Resultsmentioning

confidence: 99%

Sensitivity Enhancement of a Concave Shaped Optical Fiber Refractive Index Sensor Covered with Multiple Au Nanowires

Pathak

Rahman

Singh

et al. 2019

Sensors

View full text Add to dashboard Cite

In the present paper, a new kind of concave shaped refractive index sensor (CSRIS) exploiting localized surface plasmon resonance (LSPR) is proposed and numerically optimized. The LSPR effect between polaritons and the core guided mode of designed CSRIS is used to enhance the sensing performance. The sensor is characterized for two types of sensing structures coated with gold (Au) film and Au nanowires (AuNWs), respectively. The influence of structural parameters such as the distance (D) of the concave shaped channel (CSC) from the core, the diameter of the nanowire (dn) and the size (s) of the CSC are investigated here. In comparison to Au film, the AuNWs are shown to significantly enhance the sensitivity and the performance of the designed sensor. An enhanced sensitivity of 4471 nm/RIU (refractive index unit) is obtained with AuNWs, for a wide range of analytes refractive index (na) varying between 1.33 to 1.38. However, for conventional Au film; the sensitivity of 808.57 nm/RIU is obtained for the same range of analytes.

show abstract

Section: Resultsmentioning

confidence: 99%

Sensitivity Enhancement of a Concave Shaped Optical Fiber Refractive Index Sensor Covered with Multiple Au Nanowires

Pathak

Rahman

Singh

et al. 2019

Sensors

View full text Add to dashboard Cite

show abstract

“…At this wavelength, energy of core guided mode is highly lost. The confinement loss calculation formula is given in the following equation [35]:…”

Section: Methods and Device Structurementioning

confidence: 99%

Refractive Index Sensor Based on Surface Plasmon Resonance Excitation in a D-Shaped Optical Fiber Coated by Tantalum

Vayghan¹,

Eftekharinia²

2022

Plasmonics

View full text Add to dashboard Cite

In this paper, a plasmonic refractive index sensor using a D-shaped optical fiber coated by tantalum has been proposed. The interaction between fiber fundamental mode and plasmonic mode which lead to the formation of resonance peaks depending on the analyte refractive index (RI) are investigated in detail. Using spectral sensitivity methods, the sensing performance of the proposed sensor for detecting analytes is numerically studied. The effect of various design parameters of proposed sensor are optimized numerically to achieve the maximum wavelength sensitivity. The proposed D-shaped optical fiber sensor has a RI detection range of 1.30 to 1.43 and exhibits a non-linear increasing spectral sensitivity from 1300 nm/RIU to 3900 nm/RIU. The proposed RI sensor is attractive for detecting different RI chemical and biochemical samples due to simple design, relatively large detection range, cost-effective, non-toxic nature and highly corrosion resistivity plasmonic material.

show abstract

“…The numerically simulated results exhibit that the proposed sensor achieves an extremely high sensitivity of 90500 nm/RIU for higher refractive index. To the best of our knowledge, the proposed sensor achieves the highest sensitivity compared to other sensors based on similar techniques [8]- [11]. In addition, the micro-drilling method [12] with the Q-switch laser provides a simple fabrication step and also allows the optical fiber sensor to have precise dimensions compared to that made by using a D-shaped polishing technique [13].…”

Section: Iintroductionmentioning

confidence: 92%

“…Recently, in order to provide a simple structure, Santos et al reported a suspended core optical fiber structure incorporating gold nanowire and achieved good sensitivity in comparison to the conventional single-mode fiber (SMF) [7]. In the same year, we have reported hollow core fiber (HCF) sensor consists of an AuNW and achieve an average sensitivity of 10560 nm/RIU for RI = 1.46-1.48 [8]. The major limitation of our previously reported sensor was the difficulty of maintaining fundamental light in large diameter of HCF (40 µm), and its application for high refractive index analyte which is beyond the reported biofluids.…”

Section: Iintroductionmentioning

confidence: 99%

Nanowire Embedded Micro-Drilled Dual-Channel Approach to Develop Highly Sensitive Biosensor

Pathak

Rahman

Viphavakit

2022

IEEE Photon. Technol. Lett.

Self Cite

View full text Add to dashboard Cite

In this letter, we propose a novel approach to develop a highly sensitive surface plasmon resonance (SPR) based fiber optics biosensor. The sensor comprises a dual-drilled channel (DDC) with gold-nanowire (AuNW) contained in each channel to excite the plasmon modes. The SPR effect between the core guided mode and the surface plasmon polariton (SPP) modes of the DDC is used to evaluate the sensing response with respect to different analytes. The sensing performance, coupling characteristics, and the fabrication tolerance of the sensor are numerically analyzed and characterized by using a full-vectorial Finite Element Method (FEM). The designed sensor shows a minimum sensitivity of 3150 nm/RIU for refractive index (RI) = 1.310. While, the sensor exhibits an extremely high sensitivity varying from 10250 nm/RIU to 90500 nm/RIU for RI varied over the range of 1.370 to 1.400. Various structural parameters, e.g., separation of the channel from the core, the radius of the AuNW, the fabrication tolerance, etc., have been studied in this work. In addition, the possible fabrication steps of such a design have been discussed indicating its simple practical realization.

show abstract

Metal Nanowire Assisted Hollow Core Fiber Sensor for an Efficient Detection of Small Refractive Index Change of Measurand Liquid

Cited by 39 publications

References 23 publications

Sensitivity Enhancement of a Concave Shaped Optical Fiber Refractive Index Sensor Covered with Multiple Au Nanowires

Sensitivity Enhancement of a Concave Shaped Optical Fiber Refractive Index Sensor Covered with Multiple Au Nanowires

Refractive Index Sensor Based on Surface Plasmon Resonance Excitation in a D-Shaped Optical Fiber Coated by Tantalum

Nanowire Embedded Micro-Drilled Dual-Channel Approach to Develop Highly Sensitive Biosensor

Contact Info

Product

Resources

About