scholarly journals Highly Sensitive Biosensor Based on Partially Immobilized Silver Nanopillars in the Terahertz Band

Photonics ◽  
2021 ◽  
Vol 8 (10) ◽  
pp. 438
Author(s):  
Shuo Liu ◽  
Lin Li ◽  
Zhenxu Bai
Keyword(s):  
Refractive Index ◽  
Cross Section ◽  
Loss Peak ◽  
Local Surface ◽  
Local Surface Plasmon Resonance ◽  
Valuable Data ◽  
Terahertz Band ◽  
Highly Sensitive ◽  
Resonance Properties ◽  
Working Frequency

In this paper, a highly sensitive biosensor based on partially immobilized silver nanopillars is proposed. The working frequency of this sensor is in the terahertz band, and the range of the detected refractive index is 1.33 to 1.38. We set air holes of two different sizes on the cross-section of the optical fiber and arranged them into a hexagon. In order to improve the sensitivity, silver nanopillars were immobilized on part of the surface of the fiber cladding. The method for detecting the change of refractive index of the bio-analyte was based on local surface plasmon resonance properties of noble metal. The research recorded valuable data about the values of loss peak and full width at half maximum as well as resonance frequency shift under different setting conditions. The data present the biosensor‘s final sensitivity as 1.749 THz/RIU.

Analysis of Local Surface Plasmon Resonance in Multilayered Au/Ag/Graphene Nanoshells

NANO ◽  
2017 ◽  
Vol 12 (05) ◽  
pp. 1750062 ◽  
Author(s):  
Chao Liu ◽  
Zhaoting Liu ◽  
Jingwei Lv ◽  
Tao Sun ◽  
Qiang Liu ◽  
...  
Keyword(s):  
Refractive Index ◽  
Surface Plasmon Resonance ◽  
Surface Plasmon ◽  
Plasmon Resonance ◽  
Graphene Layer ◽  
Surrounding Medium ◽  
Dipole Approximation ◽  
Localized Surface Plasmon ◽  
Local Surface ◽  
Local Surface Plasmon Resonance

The localized surface plasmon resonance (LSPR) properties of Au/Ag/graphene nanoshells are studied by discrete dipole approximation (DDA). The coupled resonance wavelengths show a remarkable dependence on the graphene thickness as well as refractive index of the surrounding medium. The resonance wavelengths of Au/Ag/graphene nanoshells red-shift as the thickness of the graphene layer is increased, when the radii of the Au core and Ag interlayer are 40[Formula: see text]nm and 45[Formula: see text]nm, respectively. Specifically, the longer wavelength red-shifts from 540[Formula: see text]nm to 740[Formula: see text]nm when the refractive index varies from 1.25 to 2.05.

scholarly journals Theoretical Study of the Local Surface Plasmon Resonance Properties of Silver Nanosphere Clusters

Plasmonics ◽  
2013 ◽  
Vol 8 (3) ◽  
pp. 1351-1360 ◽  
Author(s):  
Ye-Wan Ma ◽  
Zhao-Wang Wu ◽  
Li-Hua Zhang ◽  
Jie Zhang ◽  
Guo-Shu Jian ◽  
...  
Keyword(s):  
Surface Plasmon Resonance ◽  
Surface Plasmon ◽  
Plasmon Resonance ◽  
Theoretical Study ◽  
Local Surface ◽  
Local Surface Plasmon Resonance ◽  
Resonance Properties

scholarly journals Highly Sensitive Local Surface Plasmon Resonance in Anisotropic Au Nanoparticles Deposited on Nanofibers

2015 ◽  
Vol 2015 ◽  
pp. 1-8 ◽  
Author(s):  
Masanari Saigusa ◽  
Kazuma Tsuboi ◽  
Yuichi Konosu ◽  
Minoru Ashizawa ◽  
Akihiko Tanioka ◽  
...  
Keyword(s):  
Surface Plasmon Resonance ◽  
Surface Plasmon ◽  
Plasmon Resonance ◽  
Au Nanoparticles ◽  
Vinylidene Fluoride ◽  
High Surface ◽  
Close Correlation ◽  
Local Surface ◽  
Local Surface Plasmon Resonance ◽  
Highly Sensitive

This paper reports the facile and high-throughput fabrication method of anisotropic Au nanoparticles with a highly sensitive local surface plasmon resonance (LPR) using cylindrical nanofibers as substrates. The substrates consisting of nanofibers were prepared by the electrospinning of poly(vinylidene fluoride) (PVDF). The Au nanoparticles were deposited on the surface of electrospun nanofibers by vacuum evaporation. Scanning electron microscopy revealed the formation of a curved Au island structure on the surface of cylindrical nanofibers. Polarized UV-visible extinction spectroscopy showed anisotropy in their LPR arising from the high surface curvature of the nanofiber. The LPR of the Au nanoparticles on the thinnest nanofiber with a diameter of ~100 nm showed maximum refractive index (RI) sensitivity over 500 nm/RI unit (RIU). The close correlation between the fiber diameter dependence of the RI sensitivity and polarization dependence of the LPR suggests that anisotropic Au nanoparticles improve RI sensitivity.

scholarly journals High-Sensitivity Terahertz Refractive Index Sensor in a Multilayered Structure with Graphene

Nanomaterials ◽  
2020 ◽  
Vol 10 (3) ◽  
pp. 500 ◽  
Author(s):  
Jiao Tang ◽  
Yunyang Ye ◽  
Jiao Xu ◽  
Zhiwei Zheng ◽  
Xiangliang Jin ◽  
...  
Keyword(s):  
Refractive Index ◽  
High Sensitivity ◽  
Multilayered Structure ◽  
Monolayer Graphene ◽  
Refractive Index Sensor ◽  
Optical Resonance ◽  
Graphene Layers ◽  
Terahertz Band ◽  
Highly Sensitive ◽  
Terahertz Frequencies

In this paper, we propose a high-sensitivity optical sensor at terahertz frequencies based on a composite structure containing a one-dimensional photonic crystal (1D PC) coated with a layer of monolayer graphene. Between the 1D PC and the graphene there is a sensing medium. This high-sensitivity phenomenon originates from the excitation of optical resonance between the graphene and the 1D PC. The proposed sensor is highly sensitive to the Fermi energy of graphene, the thickness and refractive index of the sensing medium, and the number of graphene layers. By selecting appropriate parameters, the maximum sensitivity ( 407.36 ∘ / RIU ) is obtained. We believe the proposed configuration is promising for fabricating graphene-based biosensor- or gas-sensor devices and other related applications in the terahertz band.

scholarly journals Highly Sensitive D-Shaped Plasmonic Refractive Index Sensor for a Broad Range of Refractive Index Detection

2021 ◽  
Vol 13 (1) ◽  
pp. 1-11
Author(s):  
Emranul Haque ◽  
Abdullah Al Noman ◽  
Md. Anwar Hossain ◽  
Nguyen Hoang Hai ◽  
Yoshinori Namihira ◽  
...  
Keyword(s):  
Refractive Index ◽  
Refractive Index Sensor ◽  
Highly Sensitive ◽  
Refractive Index Detection
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