scholarly journals Plasmonic Refractive Index Sensors Based on One- and Two-Dimensional Gold Grating on a Gold Film

2020 ◽  
Vol 10 (4) ◽  
pp. 375-386 ◽  
Author(s):  
Jiankai Zhu ◽  
Xiangxian Wang ◽  
Yuan Wu ◽  
Yingwen Su ◽  
Tianxu Jia ◽  
...  
Keyword(s):  
Refractive Index ◽  
Composite Structure ◽  
Composite Structures ◽  
Gold Film ◽  
Grating Period ◽  
Two Dimensional ◽  
Period Range ◽  
Refractive Index Sensing ◽  
Resonance Modes ◽  
Comparison Results

Abstract In this paper, we propose two kinds of composite structures based on the one- and two-dimensional (1D&2D) gold grating on a gold film for plasmonic refractive index sensing. The resonance modes and sensing characteristics of the composite structures are numerically simulated by the finite-difference time-domain method. The composite structure of the 1D gold semi-cylinder grating and gold film is analyzed first, and the optimized parameters of the grating period are obtained. The sensitivity and figure of merit (FOM) can reach 660RIU/nm and 169RIU−1, respectively. Then, we replace the 1D grating with the 2D gold semi-sphere particles array and find that the 2D grating composite structure can excite strong surface plasmon resonance intensity in a wider period range. The sensitivity and FOM of the improved composite structure can reach 985RIU/nm and 298 RIU−1, respectively. At last, the comparison results of the sensing performance of the two structures are discussed. The proposed structures can be used for bio-chemical refractive index sensing.

Atomically flat symmetric elliptical nanohole arrays in a gold film for ultrasensitive refractive index sensing

Lab on a Chip ◽  
2013 ◽  
Vol 13 (13) ◽  
pp. 2541 ◽  
Author(s):  
Gabriela Andrea Cervantes Tellez ◽  
Sa'ad Hassan ◽  
R. Niall Tait ◽  
Pierre Berini ◽  
Reuven Gordon
Keyword(s):  
Refractive Index ◽  
Gold Film ◽  
Refractive Index Sensing ◽  
Nanohole Arrays ◽  
Atomically Flat

Ultra-narrow band near infrared tunable two-dimensional perfect absorber for refractive index sensing

2021 ◽  
Author(s):  
xing huang ◽  
Tao Wang ◽  
Ruoqin Yan ◽  
Xiaoyun Jiang ◽  
Xinzhao Yue ◽  
...  
Keyword(s):  
Refractive Index ◽  
Near Infrared ◽  
Narrow Band ◽  
Perfect Absorber ◽  
Two Dimensional ◽  
Refractive Index Sensing

scholarly journals Polarized holographic lithography system for high-uniformity microscale patterning with periodic tunability

2021 ◽  
Vol 7 (1) ◽  
Author(s):  
Gaopeng Xue ◽  
Qihang Zhai ◽  
Haiou Lu ◽  
Qian Zhou ◽  
Kai Ni ◽  
...  
Keyword(s):  
Dimensional Space ◽  
Three Dimensional ◽  
Grating Period ◽  
Polarization Modulation ◽  
Holographic Lithography ◽  
Two Dimensional ◽  
Period Range ◽  
High Uniformity ◽  
Polarization States ◽  
Lithography System

AbstractPeriodic microscale array structures play an important role in diverse applications involving photonic crystals and diffraction gratings. A polarized holographic lithography system is proposed for patterning high-uniformity microscale two-dimensional crossed-grating structures with periodic tunability. Orthogonal two-axis Lloyd’s mirror interference and polarization modulation produce three sub-beams, enabling the formation of two-dimensional crossed-grating patterns with wavelength-comparable periods by a single exposure. The two-dimensional-pattern period can also be flexibly tuned by adjusting the interferometer spatial positioning. Polarization states of three sub-beams, defining the uniformity of the interference fringes, are modulated at their initial-polarization states based on a strict full polarization tracing model in a three-dimensional space. A polarization modulation model is established considering two conditions of eliminating the unexpected interference and providing the desired identical interference intensities. The proposed system is a promising approach for fabricating high-uniformity two-dimensional crossed gratings with a relatively large grating period range of 500–1500 nm. Moreover, our rapid and stable approach for patterning period-tunable two-dimensional-array microstructures with high uniformity could be applicable to other multibeam interference lithography techniques.

Multispectral Refractive Index Sensing Using Surface Plasmon Resonance on Gold Nanoslits

2010 ◽  
Vol 1253 ◽  
Author(s):  
Pei-Yu Chung ◽  
Kuang-Li Lee ◽  
Gregory Schultz ◽  
Pei-Kuen Wei ◽  
Christopher Batich
Keyword(s):  
Refractive Index ◽  
Surface Plasmon Resonance ◽  
Surface Plasmon ◽  
Plasmon Resonance ◽  
Signal To Noise Ratio ◽  
High Sensitivity ◽  
Peak Shift ◽  
Refractive Index Sensing ◽  
Resonance Modes ◽  
Multispectral Analysis

AbstractSurface plasmon resonance (SPR) biosensors are widely used in sensitive chemical, biological and environmental sensing. Recently, the studies of nano-plasmonics in metallic structures have shown that surface plasmons can also be excited by the metallic nanostructures films which can be used for high-throughput and chip-based SPR type sensing. We developed a class of plasmonic crystal-like structures consisting of a film with arrays of periodic nanoslit geometry. Because the engineered array ensures multiple resonance modes, we use the multispectral analysis to evaluate the refractive index sensing capability. Different from the common method monitoring a single peak shift, the multispectral analysis, observing all the peak shifts and intensity changes in the multiple plasmonic resonances in the spectra, can improve the signal-to-noise ratio of the system and enhance the sensing capabilities. In this investigation, we studied the best condition for the gold nanoslit arrays by testing their ability for refractive index sensing, and a high sensitivity of up to 28586 %T nm/RIU was obtained by multispectral analysis (RIU = refreactive index unit, and T= transmission).

scholarly journals Transmissive Refractive Index Sensing Based on Frequency-Sensitive Responses of Two-Dimensional Photonic Crystals

2016 ◽  
Vol 8 (5) ◽  
pp. 1-7 ◽  
Author(s):  
Xulin Lin ◽  
Haiwen Fang ◽  
Lin Wang ◽  
Guo Ping Wang ◽  
Xunya Jiang
Keyword(s):  
Refractive Index ◽  
Photonic Crystals ◽  
Two Dimensional ◽  
Refractive Index Sensing

FIRE RESISTACE OF SHEAR CONNECTORS FOR COMPOSITE BEAMS

2020 ◽  
Vol 92 (6) ◽  
pp. 59-65
Author(s):  
G.P. TONKIH ◽  
◽  
D.A. CHESNOKOV ◽  
◽  
Keyword(s):  
Fire Resistance ◽  
Composite Structure ◽  
Composite Structures ◽  
Composite Beams ◽  
Design Codes ◽  
Connection Strength ◽  
Shear Connectors ◽  
Shear Connection ◽  
Capacity Reduction ◽  
Russian Research

Most of Russian research about composite structure fire resistance are dedicated to the composite slab behavior. The composite beams fire resistance had been never investigated in enough volume: the temperature evaluation within the scope of the actual Russian design codes leads to the significant reduction in the shear connection strength. Meanwhile, there no correlation between the strength decreasing and type of the shear connection. The article provides an overview of the relevant researches and offers some approaches which could take into account bearing capacity reduction of the shear connectors within composite structures design.

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