A Potential Plasmonic Biosensor Based Asymmetric Metal Ring Cavity with Extremely Narrow Linewidth and High Sensitivity

To achieve high sensitivity and multi-mode sensing characteristics based on the plasmon effect, we explored a high-sensitivity refractive index sensor structure with narrow linewidth and high absorption characteristics based on theoretical analysis. The sensor structure is composed of periodic asymmetric ring cavity array, spacer layer and metal thin-film layer. The reflection spectrum of this structure shows six resonance modes in the wavelength range from visible to near-infrared. The sensor performance was optimized based on the change of the sensor structure parameters combining the simulation data, and the results shown that this kind of asymmetric laminated structure sensor has good sensing performance. In theory, it can be combined with microfluidic technology to achieve sensing detection of diverse test samples, multi-mode and multi-component, which has great potential in the field of biosensing.

Download Full-text

Wide Range Refractive Index Sensor Using a Birefringent Optical Fiber

10.21203/rs.3.rs-172462/v1 ◽

2021 ◽

Author(s):

Moutusi De ◽

Vinod Kumar Singh

Keyword(s):

Refractive Index ◽

Near Infrared ◽

High Sensitivity ◽

Infrared Region ◽

Device Fabrication ◽

Refractive Index Sensor ◽

Potential Candidate ◽

Wide Range ◽

Analyte Detection ◽

Birefringent Optical Fiber

Abstract In this article, an efficient high birefringent D-shaped photonic crystal fiber (HB-D-PCF) plasmonic refractive index sensor is reported. It is able to work over a long low refractive index (RI) analyte range from 1.29 to 1.36. This modified simple structured hexagonal PCF has high birefringence in the near-infrared region. A thin gold film protected by a titanium dioxide (TiO2) layer is deposited on the D-surface of the PCF which acts as surface plasmon active layer. The sensor consists of an analyte channel on the top of the fiber. The performance of the HB-D-PCF is analyzed based on finite element method (FEM). Both wavelength and amplitude interrogation techniques are applied to study the sensing performance of the optimized sensor. Numerical results show wavelength and amplitude sensitivity of 9245nm/RIU and 1312 RIU-1 respectively with high resolution. Owing to the high sensitivity, long range sensing ability as well as spectral stability the designed HB-D-PCF SPR sensor is a potential candidate for water pollution control, glucose concentration testing, biochemical analyte detection as well as portable device fabrication.

Download Full-text

Enhanced Sensitivity and Detection of Near-Infrared Refractive Index Sensor with Plasmonic Multilayers

Sensors ◽

10.3390/s21217056 ◽

2021 ◽

Vol 21 (21) ◽

pp. 7056

Author(s):

Tan Tai Nguyen ◽

Nguyen Van Sau ◽

Quang Minh Ngo ◽

Gauthier Eppe ◽

Ngoc Quyen Tran ◽

...

Keyword(s):

Refractive Index ◽

Near Infrared ◽

High Sensitivity ◽

Dielectric Films ◽

Silver Layer ◽

Refractive Index Sensor ◽

Detection Accuracy ◽

Spr Sensor ◽

Enhanced Sensitivity ◽

Sensor Sensitivity

In this work, the multilayer of the surface plasmon resonance (SPR) sensor was optimized to achieve the maximum sensor sensitivity. By optimizing the thickness of the silver layer (Ag) and dielectric films (TiO2 and AlAs), the optimum sensitivity of the SPR sensor could be obtained. The performance of the SPR sensor proposed was compared with control simulations utilizing zinc oxide (ZnO) and molybdenum oxide (MoO3). The numerical results indicate that the figure-of-merits (FOM) of the SPR sensor was achieved around 150/RIU, corresponding to the sensor sensitivity of 162.79°/RIU with the optimized thicknesses of the TiO2, Ag, and AlAs layers of 140 nm, 60 nm, and 25 nm, respectively. This refractive index sensor shows the FOM to have high detection accuracy and high sensitivity that lead to finding potential application in bio-chemical detection with a small volume of liquid used in biological diagnosis.

Download Full-text

High Sensitivity of Surface Plasmon Enhanced Refractive Index Sensor Based on Tunable Liquid Core Photonic Crystal Fiber Covered with Four Gold-Films

10.21203/rs.3.rs-605707/v1 ◽

2021 ◽

Author(s):

Zhenkai Fan ◽

Jianye Qin ◽

Shichao Chu ◽

Junling Gao

Keyword(s):

Refractive Index ◽

Photonic Crystal ◽

Photonic Crystal Fiber ◽

Surface Plasmon ◽

Near Infrared ◽

Liquid Core ◽

High Sensitivity ◽

Confinement Loss ◽

Refractive Index Sensor ◽

Crystal Fiber

Abstract A high sensitivity near-infrared photonic crystal fiber (PCF) refractive index sensor based on surface plasmon resonance (SPR) is proposed in this paper. The sensing performance of the PCF refractive index sensor is calculated and analyzed by using the finite element method (FEM). The coated metal material selects for chemically stable gold, which is used to induce SPR. The resonant coupling will occurs when the phase matching condition is met between the surface plasmon polariton (SPP) mode and the fundamental mode. The influence of the diameter of the central hole and the thickness of the gold film on the resonance wavelength and the confinement loss was studied. Numerical results demonstrate that the average sensitivity of the sensor can reach to 3200nm/RIU, which can be used in the field of refractive index detecting.

Download Full-text

A High Sensitivity Index Sensor Based on No-Core Fibers

Applied Mechanics and Materials ◽

10.4028/www.scientific.net/amm.284-287.1986 ◽

2013 ◽

Vol 284-287 ◽

pp. 1986-1990

Author(s):

Guei Ru Lin ◽

Ming Yue Fu ◽

Hao Jan Sheng ◽

Hai Tao Sun ◽

Wen Fung Liu

Keyword(s):

Refractive Index ◽

High Sensitivity ◽

Single Mode ◽

Wavelength Shift ◽

Refractive Index Sensor ◽

Sensitivity Index ◽

Reflective Index ◽

Index Measurement ◽

Core Fiber ◽

Multi Mode

A simple, small-size, compact and high-sensitivity refractive-index sensor composed of a short no-core fiber (NCF) about 20 mm in length sandwiched between two pieces of single-mode fibers is proposed in this paper. The index measurement is experimentally demonstrated with the sensitivity of 7792.85 nm/ RIU in the range from 1.440 to 1.454 and 227.14 nm/ RIU in the range from 1.300 to 1.430. This sensing mechanism is based on the induced multi-mode interfering wavelength shift in the no-core fiber when the reflective index of the fiber outside is changed.

Download Full-text

High Sensitivity Refractive Index Sensor Based on the Excitation of Long-Range Surface Plasmon Polaritons in H-Shaped Optical Fiber

Sensors ◽

10.3390/s20072111 ◽

2020 ◽

Vol 20 (7) ◽

pp. 2111 ◽

Cited By ~ 5

Author(s):

Nelson Gomez-Cardona ◽

Erick Reyes-Vera ◽

Pedro Torres

Keyword(s):

Refractive Index ◽

Optical Fiber ◽

Long Range ◽

Surface Plasmon ◽

High Sensitivity ◽

Refractive Index Sensor ◽

Promising Alternative ◽

Sensor Performance ◽

Wide Range ◽

Sensor Structure

In this paper, we propose and numerically analyze a novel design for a high sensitivity refractive index (RI) sensor based on long-range surface plasmon resonance in H-shaped microstructured optical fiber with symmetrical dielectric–metal–dielectric waveguide (DMDW). The influences of geometrical and optical characteristics of the DMDW on the sensor performance are investigated theoretically. A large RI analyte range from 1.33 to 1.39 is evaluated to study the sensing characteristics of the proposed structure. The obtained results show that the DMDW improves the coupling between the fiber core mode and the plasmonic mode. The best configuration shows 27 nm of full width at half maximum with a resolution close to 1.3 × 10 − 5 nm, a high sensitivity of 7540 nm/RIU and a figure of merit of 280 RIU − 1 . Additionally, the proposed device has potential for multi-analyte sensing and self-reference when dissimilar DMDWs are deposited on the inner walls of the side holes. The proposed sensor structure is simple and presents very competitive sensing parameters, which demonstrates that this device is a promising alternative and could be used in a wide range of application areas.

Download Full-text

High Sensitivity Refractive Index Sensor Based on Multicoating Photonic Crystal Fiber With Surface Plasmon Resonance at Near-Infrared Wavelength

IEEE Photonics Journal ◽

10.1109/jphot.2017.2687121 ◽

2017 ◽

Vol 9 (2) ◽

pp. 1-8 ◽

Cited By ~ 7

Author(s):

Duanming Li ◽

Wei Zhang ◽

Huan Liu ◽

Jiangfei Hu ◽

Guiyao Zhou

Keyword(s):

Refractive Index ◽

Surface Plasmon Resonance ◽

Photonic Crystal ◽

Surface Plasmon ◽

Plasmon Resonance ◽

Near Infrared ◽

High Sensitivity ◽

Refractive Index Sensor ◽

Infrared Wavelength ◽

Crystal Fiber

Download Full-text

Highly sensitive refractive index sensor based on SPR with silver and titanium dioxide coating

10.21203/rs.3.rs-171313/v1 ◽

2021 ◽

Author(s):

haiming yang ◽

Guangyao Wang ◽

Ying Lu ◽

Jianquan Yao

Keyword(s):

Refractive Index ◽

Titanium Dioxide ◽

Near Infrared ◽

High Sensitivity ◽

Organic Chemical ◽

Refractive Index Sensor ◽

Geometrical Parameters ◽

Crystal Fiber ◽

Wavelength Sensitivity ◽

Highly Sensitive

Abstract A surface plasmon resonance (SPR) sensor based on dual-layered air hole shaped photonic crystal fiber (PCF) is proposed to realize the simultaneous measurement of refractive index (RI). The plasma materials silver (Ag) and titanium dioxide (TiO2) were sequentially coated on the outer surface of PCF to obtain enhanced sensing properties. By carefully adjusting the geometrical parameters, the simulation results show a maximum wavelength sensitivity of 72000 nm/RIU for analyte refractive indices ranging from 1.26 to 1.365, which realizes the high-sensitivity sensing in the visible to near-infrared optical band. Moreover, the sensor attains a maximum figure of merit (FOM) of 229 and RI resolution of 1.29 × 10− 6. This work shows great potential for real-time, affordable, and accurate measurement in biomedical, biological and organic chemical domains.

Download Full-text

Magnetoelastic Coupling and Delta-E Effect in Magnetoelectric Torsion Mode Resonators

Sensors ◽

10.3390/s21062022 ◽

2021 ◽

Vol 21 (6) ◽

pp. 2022

Author(s):

Benjamin Spetzler ◽

Elizaveta V. Golubeva ◽

Ron-Marco Friedrich ◽

Sebastian Zabel ◽

Christine Kirchhof ◽

...

Keyword(s):

Low Frequency ◽

High Sensitivity ◽

Element Model ◽

Mode Number ◽

Frequency Change ◽

General Description ◽

Resonance Modes ◽

Field Sensor ◽

Magnetic Sensitivity ◽

Bending Modes

Magnetoelectric resonators have been studied for the detection of small amplitude and low frequency magnetic fields via the delta-E effect, mainly in fundamental bending or bulk resonance modes. Here, we present an experimental and theoretical investigation of magnetoelectric thin-film cantilevers that can be operated in bending modes (BMs) and torsion modes (TMs) as a magnetic field sensor. A magnetoelastic macrospin model is combined with an electromechanical finite element model and a general description of the delta-E effect of all stiffness tensor components Cij is derived. Simulations confirm quantitatively that the delta-E effect of the C66 component has the promising potential of significantly increasing the magnetic sensitivity and the maximum normalized frequency change ∆fr. However, the electrical excitation of TMs remains challenging and is found to significantly diminish the gain in sensitivity. Experiments reveal the dependency of the sensitivity and ∆fr of TMs on the mode number, which differs fundamentally from BMs and is well explained by our model. Because the contribution of C11 to the TMs increases with the mode number, the first-order TM yields the highest magnetic sensitivity. Overall, general insights are gained for the design of high-sensitivity delta-E effect sensors, as well as for frequency tunable devices based on the delta-E effect.

Download Full-text

High Sensitivity Plasmonic Sensor Based on Fano Resonance with Inverted U-Shaped Resonator

Sensors ◽

10.3390/s21041164 ◽

2021 ◽

Vol 21 (4) ◽

pp. 1164

Author(s):

Gongli Xiao ◽

Yanping Xu ◽

Hongyan Yang ◽

Zetao Ou ◽

Jianyun Chen ◽

...

Keyword(s):

Fano Resonance ◽

Figure Of Merit ◽

High Sensitivity ◽

Refractive Index Sensor ◽

Multimode Interference ◽

Geometrical Parameters ◽

The Finite Element Method ◽

Plasmonic Sensor ◽

Coupled Mode ◽

Plasmonic Nanosensor

Herein, we propose a tunable plasmonic sensor with Fano resonators in an inverted U-shaped resonator. By manipulating the sharp asymmetric Fano resonance peaks, a high-sensitivity refractive index sensor can be realized. Using the multimode interference coupled-mode theory and the finite element method, we numerically simulate the influences of geometrical parameters on the plasmonic sensor. Optimizing the structure parameters, we can achieve a high plasmonic sensor with the maximum sensitivity for 840 nm/RIUand figure of merit for 3.9 × 105. The research results provide a reliable theoretical basis for designing high sensitivity to the next generation plasmonic nanosensor.

Download Full-text