Journal ArticleDOI
A theoretical study of a plasmonic sensor comprising a gold nano-disk array on gold film with a SiO 2 spacer
Xiangxian Wang,Jiankai Zhu,Huan Tong,Yang Xudong,Xiaoxiong Wu,Pang Zhiyuan,Hua Yang,Yunping Qi +7 more
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TLDR
In this article, a plasmonic refractive index (RI) sensor with high RI sensitivity based on a gold composite structure is proposed, where the incident light beam is partly coupled to the localized surface plasmons (LSP) of the single nano-disks and partly transferred to the propagating surface plasms (PSP) by grating coupling.Abstract:
A plasmonic refractive index (RI) sensor with high RI sensitivity based on a gold composite structure is proposed. This composite structure is constructed from a perfect gold nano-disk square array on a gold film, with a SiO2 spacer. The reflection spectra of the composite structure, with analyte RI in the range of 1.30 to 1.40, are theoretically studied using the finite-difference time-domain method. The incident light beam is partly coupled to the localized surface plasmons (LSP) of the single nano-disks and partly transferred to the propagating surface plasmons (PSP) by grating coupling. The reflectivity is nearly zero at the valley of the reflection spectrum because of the strong coupling between LSP and PSP. Also, the full width at half maximum (FWHM) of one of the surface plasmon polaritons (SPPs) modes is very narrow, which is helpful for RI sensing. An RI sensitivity as high as 853 nm/RIU is obtained. The influence of the structure parameters on the RI sensitivity and the sensor figure of merit (FOM) are investigated in detail. We find that the sensor maintains high RI sensitivity over a large range of periods and nano-disk diameters. Results of the theoretical simulation of the composite structure as a plasmonic sensor are promising. Thus, this composite structure could be extensively applied in the fields of biology and chemistry.read more
Citations
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Broadband solar energy absorber based on monolayer molybdenum disulfide using tungsten elliptical arrays
Jiakun Li,Xifang Chen,Zao Yi,Hua Yang,Yongjian Tang,Yong Yi,Weitang Yao,Junqiao Wang,Yougen Yi +8 more
TL;DR: In this paper, the authors proposed a new type of broadband solar energy absorber based on monolayer molybdenum disulfide (MoS2) and tungsten elliptical arrays.
Journal ArticleDOI
High Quality Factor, High Sensitivity Metamaterial Graphene-Perfect Absorber Based on Critical Coupling Theory and Impedance Matching.
Chunlian Cen,Zeqiang Chen,Danyang Xu,Liying Jiang,Xifang Chen,Zao Yi,Pinghui Wu,Gongfa Li,Yougen Yi +8 more
TL;DR: Through the critical coupling effect and impedance matching, a perfect single-band absorption of the monolayer graphene is studied and high quality factor is obtained which has an absorbance close to 100% in the near infrared region.
Journal ArticleDOI
Surface plasmon resonance (SPR) infrared sensor based on D-shape photonic crystal fibers with ITO coatings
Chao Liu,Jianwei Wang,Famei Wang,Weiquan Su,Lin Yang,Jingwei Lv,Guanglai Fu,Xianli Li,Qiang Liu,Tao Sun,Paul K. Chu +10 more
TL;DR: In this article, a surface plasmon resonance sensor based on D-shaped photonic crystal fiber (PCF) is designed for sensing low refractive indexes, and its performance is investigated numerically by the finite element method (FEM).
Journal ArticleDOI
A dual-band metamaterial absorber for graphene surface plasmon resonance at terahertz frequency
Chunlian Cen,Yubin Zhang,Xifang Chen,Hua Yang,Zao Yi,Weitang Yao,Yongjian Tang,Yougen Yi,Junqiao Wang,Pinghui Wu +9 more
TL;DR: In this paper, a dual-band metamaterial absorber for graphene surface plasmon resonance at terahertz frequency is presented, where the authors use the finite difference time domain (FDTD) method to study the absorption characteristics of homocentric graphene ring and disk nanostructure.
Journal ArticleDOI
Ultra-broadband perfect absorber utilizing refractory materials in metal-insulator composite multilayer stacks
TL;DR: The polarization insensitivity is demonstrated by analyzing the absorption performance over arbitrary polarization angles, and the ultra-broadband absorption remains more than 80% over a wide incident angle up to 50°, for both transverse electric (TE) and transverse magnetic (TM) modes.
References
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P. B. Johnson,R. W. Christy +1 more
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A Review of Surface Plasmon Resonance‐Enhanced Photocatalysis
Wenbo Hou,Stephen B. Cronin +1 more
TL;DR: In the past decade, surface plasmon resonance of Ag and Au nanoparticles has been investigated to improve the efficiency of photocatalytic processes as discussed by the authors, which is particularly interesting for its ability to store the sun's energy in chemical bonds that can be released later without producing harmful byproducts.
Journal ArticleDOI
Label-free detection and molecular profiling of exosomes with a nano-plasmonic sensor
Hyungsoon Im,Huilin Shao,Yong Il Park,Vanessa M. Peterson,Cesar M. Castro,Ralph Weissleder,Hakho Lee +6 more
TL;DR: The nano-plasmonic exosome (nPLEX) assay is based on transmission surface plasmon resonance through periodic nanohole arrays and offers improved sensitivity over previous methods, enables portable operation when integrated with miniaturized optics and allows retrieval of exosomes for further study.
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