Proceedings ArticleDOI
Sensitivity improvement of the surface plasmon resonance optical sensor by using a gold-silver transducing layer
Shu-Yuen Wu,Ho-Pui Ho +1 more
- pp 63-68
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TLDR
In this article, the spectral characteristics of spectral surface plasmon resonance (SPR) sensors that use composite silver/gold films for the transducing layer have been studied by using Fresnel formulas.Abstract:
It is well established that the surface plasmon resonance (SPR) optical sensor based on a metal-dielectric configuration can provide high sensitivity for many applications such as chemical and biological sensing. In fact the gold-dielectric configuration is most commonly used in the SPR sensor because of the fact that the thin gold layer can provide stable performance and good chemical resistance. In this paper, the characteristics of spectral SPR sensors that use composite silver/gold films for the transducing layer have been studied by using Fresnel formulas. Our simulations indicate that the optimal layer configuration for spectral SPR sensors should be gold(2 nm)-silver(48 nm)-dielectric for achieving best sensitivity.read more
Citations
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Journal ArticleDOI
Optimised film thickness for maximum evanescent field enhancement of a bimetallic film surface plasmon resonance biosensor
TL;DR: In this article, a double-layer configuration of a surface plasmon resonance (SPR) optical biosensor with a bimetallic silver-gold configuration is presented, which integrates the better evanescent field enhancement of silver, the higher resolution in the reflectivity minimum of silver and the high chemical resistance of gold.
Journal ArticleDOI
Surface plasmon sensor with enhanced sensitivity using top nano dielectric layer
TL;DR: In this paper, the authors used a 10-15 nm top layer of dielectric film with a high value of the real part'e of the Dielectric function, on top of an SPR sensor in the Kretschmann configuration.
Journal ArticleDOI
Metallic film optimization in a surface plasmon resonance biosensor by the extended Rouard method.
TL;DR: The extended Rouard method is applied to the computation of a multi-absorbing-layer system for the optimization of surface plasmon resonance (SPR) sensors and the effect of the properties of a metallic layer on the shape of the reflectivity and sensitivity curve is demonstrated in the case of a Kretschmann configuration.
Journal ArticleDOI
Bimetallic structure fabricated by laser interference lithography for tuning surface plasmon resonance
TL;DR: It is observed that for gold thin film on quartz substrate, the optical spectral peak is blue shifted when a silver thin film is coated over it, and the bimetallic nanodot array shows a similar blue shift in its spectral peak.
Journal ArticleDOI
Experimental Comparison of Fiber-Optic Surface Plasmon Resonance Sensors with Multi Metal Layers and Single Silver or Gold Layer
Abstract: Fiber-optic surface plasmon resonance sensors with multi metal layers (Ti/Ag/Au) and single silver or gold layer are presented. In comparison with widely used single-layer sensors, the multi-layer sensor shows a wider refractive index measurement range (in a range of 1.3344 to 1.4111 RIU) and a better resolution in the high refractive index region (refractive index over 1.3697 RIU). In addition, the sensitivity of multi-layer sensor is between those of sensors with silver and gold layers, the chemical stability, and the film adhesion capability of multi-layer sensor are much better than those of silver layer sensor.
References
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Journal ArticleDOI
Surface plasmon resonance sensors: review
TL;DR: Main application areas are outlined and examples of applications of SPR sensor technology are presented and future prospects of SPR technology are discussed.
Journal ArticleDOI
Formation of monolayer films by the spontaneous assembly of organic thiols from solution onto gold
Colin D. Bain,E. Barry Troughton,Yu-Tai Tao,Joseph Evall,George M. Whitesides,Ralph G. Nuzzo +5 more
TL;DR: In this paper, the authors used contact angles and optical ellipsometry to study the kinetics of adsorption of monolayer films and to examine the experimental conditions necessary for the formation of high-quality films.
Book
Optical Waves in Layered Media
Pochi Yeh,Michael Hendry +1 more
TL;DR: In this article, the Electromagnetic Field and its interaction with Matter are discussed, and a matrix formulation for Isotropic Layered Media is proposed. But it is not shown how to apply it to a single homogeneous and isotropic layer.
Book
Optical waves in layered media
TL;DR: Optics of Semiconductor Quantum Wells and Superlattice Structures: Optics of A Single Homogeneous and Isotropic Layer and some Applications of Isotropic Layered Media.
Journal ArticleDOI
Optical properties of the metals Al, Co, Cu, Au, Fe, Pb, Ni, Pd, Pt, Ag, Ti, and W in the infrared and far infrared
TL;DR: The data for the noble metals and Al, Pb, and W can be reasonably fit using the Drude model and it is shown that -epsilon1(omegas) = epsilon2(omega) approximately omega(2)(p)/(2omega( 2)(tau) at the damping frequency omega = omega(tau), where the plasma frequency is omega(p).