Gold grating assisted SPR based D-shaped single mode fiber for detection of liquid refractive index

Khanikar, Tulika; Singh, Vinod Kumar

doi:10.1007/s11082-019-2013-7

Cited by 36 publications

(14 citation statements)

References 23 publications

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“…However, with increasing wavelength, most of the electromagnetic field extended into the cladding region and resulted in the reduction of Re(n eff ). The confinement loss for both Au NWs/film of the CSRIS can be calculated by the following equation [23]:α(dB/m) = 8.686. k 0 . Im (n eff )where the wavenumber (k 0 ) is defined as k 0 = 2π/λ.…”

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

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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.

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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

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“…During Optical waves, metals such as gold, silver, aluminum are used to intensify the surface plasmon, but the reason for this choice is the lower losses in this metal than other metals. Many metals at optical frequencies have a negative dielectric constant that causes high surface reflectance [5][6]. That, surface plasmon resonance has been used in the development of high-sensitivity optical sensing.…”

Section: Introductionmentioning

confidence: 99%

“…Fraction coefficient changes can be detected by changing the coupling conditions that cause the frequency spectrum to shift. till now, different optical fiber sensors based on SPR have been reported such as conventional fiber [6], fiber Bragg grating [7], photonic quasi-crystal fiber (PQF) [8], and photonic crystal fiber (PCF) [9]. PQF because of low loss [10], numerous birefringence and low nonlinearity [11], rich double-cladding features [12] is not important.…”

Section: Introductionmentioning

confidence: 99%

High-performance surface plasmon resonance-based photonic crystal fiber sensor with four open surface rings

Neda

Barvestani²,

Meshginqalam³

2022

J Comput Electron

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In this paper, a photonic crystal fiber sensor is proposed which have four-opening channels that support surface plasmon resonances. By detecting the optical spectrum of leakage from the fiber core to the four regions created on its periphery, the sensitivity of the sensor can be assessed. Gold is used as the plasmonic material in the infrared wavelength range on the Titanium oxide film which is used as a substrate layer to increase the coupling and adhesion. Influences of structural parameters on the sensor performance are investigated by the Finite Difference Element method. Sensitivities for refractive index of 1.34-1.44 for wavelength ranges (690-1500 nm) with maximum wavelength sensitivity of 25,600 nm / RIU and maximum amplitude sensitivity and 7367 ( RIU −1 ) and figure of merit (FOM) of 547 ( RIU −1 ) have been calculated. In addition to high sensitivity, great FOM value of this sensor is an important feature. This sensor can be used to identify chemicals and biomolecules.

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“…Due to the added advantages of optical fibers such as immunity to electromagnetic interference, small size, light weight and capability of remote sensing, fiber sensors based on SPR shows great potential for various physical, chemical, and biochemical parameters. In an optical fiber SPR sensor, the resonance condition is satisfied when the propagation constant of the guided mode as well as the plasmonic mode at the interface between the metal and dielectric becomes equal and under this condition, a sharp loss appears in the transmission spectra [4]. In comparison to standard single mode (SM) and multimode fibers (MMFs), microstructured optical fibers (MOFs) are advantageous because of their design flexibility that helps to achieve better phase matching condition and also sensitivity enhancement.…”

Section: Introductionmentioning

confidence: 99%

A D-shaped elliptical hollow core fiber SPR sensor

Khanikar

Singh

2022

J. Phys.: Conf. Ser.

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A D-shaped elliptical hollow core fiber surface plasmon resonance (SPR) sensor is proposed and analyzed here using gold and titanium oxide (TiO2) layer. The fiber geometry consists of a doped elliptical core with a concentric central elliptical air hole. A finite element method-based simulation software COMSOL Multiphysics is used for numerical analysis. Both gold and TiO2 layers are optimized. The sensor responds over a wide range of refractive index (RI) from 1.33 to 1.40. The average sensitivity obtained for the designed sensor is 4142.85nm/RIU (RI Unit) whereas that for a single mode fiber (SMF) is only 897.55nm/RIU. So, our designed sensor gives more than 4 times enhanced sensitivity and proves to be a potential alternative of SMF based low cost, compatible SPR sensors by covering the low sensitivity issue suffered by SMF sensors.

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Gold grating assisted SPR based D-shaped single mode fiber for detection of liquid refractive index

Cited by 36 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

High-performance surface plasmon resonance-based photonic crystal fiber sensor with four open surface rings

A D-shaped elliptical hollow core fiber SPR sensor

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