Properties and sensing characteristics of surface-plasmon resonance in infrared light (original) (raw)
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Surface plasmon resonance sensor with silicon-based prism coupling
Advanced Biomedical and Clinical Diagnostic Systems, 2003
We study possibilities of implementation of Surface Plasmon Resonance (SPR) sensors on purely silicon platform, in which SPR-supporting Au film is used with a silicon prism in the Kretschmann-Raether geometry. Based on theoretical and experimental analyses we have determined the conditions and parameters of SPR excitations on such a platform in the infrared light for configurations of bio-and gas sensing. The approach enables one to apply well-developed silicon microfabrication and integration methods for SPR technique, opening up the possibilities to miniaturize SPR bio-and chemical sensors.
Enhancement of Optical Coupling Efficiency of Surface Plasmon Resonance based Sensors
IEEE Access
The optical coupling efficiency of surface plasmon resonance (SPR) based sensors is theoretically investigated from the first principle. Analytical expressions for the instantaneous electric flux lines associated with the TM modes of a three-layer dielectric-metal-dielectric (DMD) waveguide structure are calculated. It is shown that these electric flux lines appear in the form of dis-continuous loops at the metal-dielectric interfaces. A careful investigation of the electric flux loops reveals that the transverse component of the electric flux dominates at the interface, and away from the interface the longitudinal electric flux component takes over. It is hence shown that in the incident p-polarized optical light which is used to excite the surface plasmon (SP) modes in SPR sensors, if the transverse component of the electric field is increased then a significant increase in the input optical coupling efficiency is observed. The increased input optical coupling increases the real part of the effective index of the SP mode of the sensor yielding an increased sensitivity of the SPR sensor. Calculations are done to optimize various design parameters of an SPR sensor in a typical prism coupling Kretschmann configuration in an angle interrogation setup. It is shown that there is an increase of 64.33% per RIU in optical coupling efficiency with a decrease in the refractive index of the high index input coupling prism, and an increase of 58.787% per RIU with an increase in the refractive index of the affinity layer. Enhancement of optical coupling efficiency due to the thickness of the metal film as well as the wavelength of the input optical light has also been evaluated. The corresponding improvement in the sensitivity and changes in full width at half maxima (FWHM), figure of merit (FOM), and signal to noise ratio (SNR) of the SPR sensor are also reported.
2012 IEEE 27th Convention of Electrical and Electronics Engineers in Israel, 2012
It is demonstrated theoretically and experimentally that, by using the guided-wave surface-plasmon sensor configuration with a top layer of dielectric thin film ͑10-15 nm͒ having a high value of the real part of the dielectric function, it is possible to improve the sensitivity of the sensor up to 1 order of magnitude. The stability is improved because the thin nanolayer acts as a protection layer for the metal. The enhancement is due to the increase in the interaction volume and the evanescent field enhancement near the top layeranalyte interface.
Optical Materials, 2005
A Si-based surface plasmon resonance (SPR) system is examined in conditions of the nanoparticle-enhanced sensing. The system is equipped with near IR pumping light and a silicon coupling prism, used with SPR-supporting gold film in the Kretschmann-Raether geometry. Using Maxwell-Garnett (MG) effective medium theory, we modeled the SPR-related response of the system to the absorption of colloidal nanoparticles of different materials (Au, Cu, Pt, Ag, Al, Ti, Pd) on gold. We show that this response strongly depends on the nanoparticle fill factor, associated with a relative volume of nanoparticles in the absorbed layer. For low fill factors (f m $ 0.1), corresponding to relatively low concentrations of small nanoparticles, the absorption of nanoparticles of different materials leads to almost identical angular shifts of the SPR dip, but to a quite different intensity damping at the dip point. In contrast, the increase of the fill factor results in quite different angular and intensity SPR characteristics for the materials used, with the most pronounced sensing responses for Pt, Pd and Ti. The proposed analysis enables to estimate the efficiency of nanoparticles of different materials as markers in nanoparticle-enhanced SPR sensing.
Tuning and sensitivity enhancement of surface plasmon resonance sensor
Sensors and Actuators B-chemical, 2007
The performance of a surface plasmon resonance (SPR) sensor depends on its design properties. In this paper, we described, both theoretically and experimentally, the role of the prism material in sensor design. The analyses were carried out by employing three prisms of different refractive indices and the reflection spectra were studied under the angular interrogation mode. The results proved that the choice of prism material can tailor the resonance condition and thus can effectively tune the working region of the sensor. Also, the experimental value of angular sensitivity increased from 94.46 • /RIU to 204.41 • /RIU on changing the refractive index of the prism from 1.597 to 1.456, without changing the other parameters. The variation of the angular sensitivity was in accordance with the analytical and numerical results. The dynamic range decreased and the full width at half maximum (FWHM) of the reflection spectra increased as the refractive index of the prism was lowered, thereby affecting the sensor's performance.
Optics letters, 2009
A high-accuracy aluminum-based surface plasmon resonance (SPR) chalcogenide sensor is proposed for IR. The structure is based on widely used 2S2G chalcogenide glass with aluminum as the SPR active metal. The angular interrogation method has been used to study the performance of the sensor in terms of intrinsic sensitivity (IS) that includes the width and shifts of the SPR curve for a given refractive index of sensing layer. The IS of Al-based chalcogenide glass sensor is almost 400% more as compared with an Au-based one, which is the most widely used SPR active metal. The oxidation problem of an Al-based SPR sensor has been addressed.
Science and innovation, 2017
An innovative project on the development of a method for manufacturing sensor chips with enhanced sensitivity for biosensors based on surface plasmon resonance (SPR) operating in the Kretschmann scheme has been completed. An increase in sensitivity of such sensor has been achieved by forming high-frequency periodic grating on the sensor chip surface using the interference photolithography technique. All processes have been optimized. A pilot sample of modernized SPR refractometer as well as a pilot batch of nanostructured sensor chips with spatial frequencies up to 3400 mm-1 have been manufactured and tested. The use of nanostructured chips has resulted in a 4.7-time increase in the SPR refractometer sensitivity.
Design and Construction of Surface Plasmon Resonance Sensor
Optics and Photonics Society of Iran, 2017
surface plasmon resonance (SPR) sensors have become a central tool for characterizing and quantifying bimolecular and drugs interactions. In this article first we have reported the processes of designing and manufacturing of our new homemade SPR sensor. Then by means of constructed sensor the refractive index of three mediums have been measured. Based on both experimental and simulated results, our SPR sensor can be used as refractive index sensor for liquid mediums (gas mediums) with sensitivity of 8×10 RIU (1.5×10 RIU).
Development and Application of Devices Based on Surface Plasmon Resonance
Cybernetics and Computer Technologies, 2020
Introduction. The purpose of the SPR sensor is to quickly and accurately determine the refractive index of the environment with the ability to diagnose the presence of a specific substance. SPR devices and biosensor diagnostic methods for laboratory diagnostics in medicine, veterinary medicine, determination of environmental pollution, for food quality control are being developed. The work is devoted to the development of devices based on the surface plasmon resonance of the “Plasmontest” series, which can be used for refractometric and biosensor applications. The purpose of the paper is to present the development of “Plasmontest” series devices that can be used for laboratory applications, as portable field-research devices and to carry out a comparison of optical circuits of SPR devices, their capabilities and operational characteristics during biochemical and physical experiment. Results. Specific features of the design of devices "Plasmontest" with discrete and apertur...
Current Trends in Technology and Materials of Sensors Based on Surface Plasmon Resonance
Advances in Materials Science and Engineering
Considered in this review are main directions of developing technology and construction of the available sensors based on surface plasmon resonance phenomenon to increase their sensitivity and accuracy of measurements. It has been shown that reducing roughness of the plasmon carrying layer in the sensor as well as application of an additional covering dielectric layer with developed surface enables two-fold increase in the sensitivity due to the twice increased surface of interaction between the sensor and studied substance. The main technical way enabling to diminish surface roughness is thermal annealing, and the best result is usually reached for the annealing temperature 120 °С. In most cases, as a dielectric layer they use metal oxides Al2 O3 , TiO2 , SiOx and ZnO, which allows attaining the detection limit in changes of the studied substance refraction index close to 1 • 10–9, what is one order better than that in available commercial analytic devices based on SPR phenomenon. ...