scholarly journals A multi-core holey fiber based plasmonic sensor with large detection range and high linearity

2012 ◽  
Vol 20 (6) ◽  
pp. 5974 ◽  
Author(s):  
Binbin Shuai ◽  
Li Xia ◽  
Yating Zhang ◽  
Deming Liu
Keyword(s):  
Plasmonic Sensor ◽  
Detection Range ◽  
Holey Fiber ◽  
High Linearity

Side-core holey fiber based plasmonic sensor

2013 ◽  
Author(s):  
Ya Han ◽  
Li Xia ◽  
Deming Liu
Keyword(s):  
Plasmonic Sensor ◽  
Holey Fiber

scholarly journals A Large Detection-Range Plasmonic Sensor Based on An H-Shaped Photonic Crystal Fiber

Sensors ◽  
2020 ◽  
Vol 20 (4) ◽  
pp. 1009 ◽  
Author(s):  
Haixia Han ◽  
Donglian Hou ◽  
Lei Zhao ◽  
Nannan Luan ◽  
Li Song ◽  
...  
Keyword(s):  
Photonic Crystal ◽  
Photonic Crystal Fiber ◽  
Direct Contact ◽  
Gold Film ◽  
Fiber Material ◽  
The Finite Element Method ◽  
Plasmonic Sensor ◽  
Detection Range ◽  
Crystal Fiber ◽  
Spr Sensor

An H-shaped photonic crystal fiber (PCF)-based surface plasmon resonance (SPR) sensor is proposed for detecting large refractive index (RI) range which can either be higher or lower than the RI of the fiber material used. The grooves of the H-shaped PCF as the sensing channels are coated with gold film and then brought into direct contact with the analyte, which not only reduces the complexity of the fabrication but also provides reusable capacity compared with other designs. The sensing performance of the proposed sensor is investigated by using the finite element method. Numerical results show that the sensor can work normally in the large analyte RI (na) range from 1.33 to 1.49, and reach the maximum sensitivity of 25,900 nm/RIU (RI units) at the na range 1.47–1.48. Moreover, the sensor shows good stability in the tolerances of ±10% of the gold-film thickness.

scholarly journals On the Effect of Soft Molecularly Imprinted Nanoparticles Receptors Combined to Nanoplasmonic Probes for Biomedical Applications

2021 ◽  
Vol 9 ◽  
Author(s):  
Nunzio Cennamo ◽  
Alessandra Maria Bossi ◽  
Francesco Arcadio ◽  
Devid Maniglio ◽  
Luigi Zeni
Keyword(s):  
Single Molecule ◽  
Limit Of Detection ◽  
Superior Performance ◽  
Slab Waveguide ◽  
Plasmonic Sensor ◽  
Detection Range ◽  
Molecularly Imprinted ◽  
Longitudinal Orientation ◽  
Molecularly Imprinted Nanoparticles ◽  
Optical Nanostructures

Soft, deformable, molecularly imprinted nanoparticles (nanoMIPs) were combined to nano-plasmonic sensor chips realized on poly (methyl methacrylate) (PMMA) substrates to develop highly sensitive bio/chemical sensors. NanoMIPs (dmean < 50 nm), which are tailor-made nanoreceptors prepared by a template assisted synthesis, were made selective to bind Bovine Serum Albumin (BSA), and were herein used to functionalize gold optical nanostructures placed on a PMMA substrate, this latter acting as a slab waveguide. We compared nanoMIP-functionalized non-optimized gold nanogratings based on periodic nano-stripes to optimized nanogratings with a deposited ultra-thin MIP layer (<100 nm). The sensors performances were tested by the detection of BSA using the same setup, in which both chips were considered as slab waveguides, with the periodic nano-stripes allocated in a longitudinal orientation with respect to the direction of the input light. Result demonstrated the nanoMIP-non optimized nanogratings showed superior performance with respect to the ultra-thin MIP-optimized nanogratings. The peculiar deformable character of the nano-MIPs enabled to significantly enhance the limit of detection (LOD) of the plasmonic bio/sensor, allowing the detection of the low femtomolar concentration of analyte (LOD ∼ 3 fM), thus outpassing of four orders of magnitude the sensitivies achieved so far on optimized nano-patterned plasmonic platforms functionalized with ultra-thin MIP layers. Thus, deformable nanoMIPs onto non-optimized plasmonic probes permit to attain ultralow detections, down to the quasi-single molecule. As a general consideration, the combination of more plasmonic transducers to different kinds of MIP receptors is discussed as a mean to attain the detection range for the selected application field.

A NEW RESONANT COUPLING BETWEEN AN ANALYTE-FILLED CORE MODE AND A SUPERMODE OF A MULTI-CORE HOLEY FIBER BASED PLASMONIC SENSOR

2012 ◽  
Vol 26 (31) ◽  
pp. 1250207 ◽  
Author(s):  
V. A. POPESCU
Keyword(s):  
Signal To Noise Ratio ◽  
Infrared Region ◽  
Phase Matching ◽  
Core Mode ◽  
Plasmonic Sensor ◽  
Holey Fiber ◽  
Resonant Coupling ◽  
High Degree ◽  
Very High ◽  
Better Than

A new resonant coupling between an analyte-filled core mode and a supermode in a multi-core holey fiber recently designed for sensing of benzene is investigated using a finite element method. The dominant electric field of the fundamental core supermode is in a high degree extended at this resonance from the hexagonal solid cores to the analyte (benzene) layer and vice versa for the analyte-filled fundamental core mode. The full width at half maximum (FWHM) bandwidth for the fundamental supermode is 5.3 nm. When the analyte refractive index is increased by 0.001 RIU, the phase matching point is shifted by 4.5 nm toward longer wavelengths, with a corresponding sensitivity better than 2.2 × 10-5 RIU and a very high value of the signal-to-noise ratio (0.85). The resonance of a fundamental supermode with the first order of surface plasmon resonance mode in the infrared region (λ = 1.33825 μ m ) can be used together with a resonant coupling between a fundamental supermode with an analyte fundamental mode in visible (λ = 0.6415 μ m ) part of the spectrum for increasing the performance of the sensor.

A VERY HIGH AMPLITUDE SENSITIVITY OF A NEW MULTI-CORE HOLEY FIBER-BASED PLASMONIC SENSOR

2013 ◽  
Vol 27 (06) ◽  
pp. 1350038 ◽  
Author(s):  
V. A. POPESCU
Keyword(s):  
Transmission Loss ◽  
Signal To Noise Ratio ◽  
Water Layer ◽  
High Amplitude ◽  
Plasmon Mode ◽  
Plasmonic Sensor ◽  
Holey Fiber ◽  
Resonant Coupling ◽  
Group Refractive Index ◽  
Better Than

The propagation characteristics in a new multi-core holey fiber-based plasmonic sensor are investigated using a finite element method. The fiber is made by a silica core with a small air hole in the center of the structure, surrounded by six air holes placed at the vertices of a hexagon, two layers of air holes arranged in a hexagonal way that are inserted in the SiO 2 core which is surrounded by a gold layer and a very thick distilled water layer. The structure is designed to have high amplitude sensitivity near the phase matching point corresponding to the maximum of the power fraction for a core guided supermode in the water and gold layers. The maximum of the imaginary part of the group refractive index is located to the same wavelength as the maximum of the amplitude sensitivity. The advantages of our design are a small value of FWHM parameter, a high value of the signal-to-noise ratio, a high value of the amplitude sensitivity (4040.9 RIU-1), a sensor resolution better than 2.5 × 10-6 RIU and a strong transmission loss of a core guided supermode at the resonant coupling due to efficient interaction with a plasmon mode.

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