Complex dielectric constant of various biomolecules as a function of wavelength using surface plasmon resonance

2014 ◽  
Vol 116 (2) ◽  
pp. 023109 ◽  
Author(s):  
Ayushi Paliwal ◽  
Monika Tomar ◽  
Vinay Gupta
Keyword(s):  
Dielectric Constant ◽  
Surface Plasmon Resonance ◽  
Surface Plasmon ◽  
Plasmon Resonance ◽  
Complex Dielectric Constant

Thickness Dependent Optical Properties of WO3 Thin Film using Surface Plasmon Resonance

2013 ◽  
Vol 1494 ◽  
pp. 233-238
Author(s):  
Ayushi Paliwal ◽  
Monika Tomar ◽  
Vinay Gupta
Keyword(s):  
Thin Film ◽  
Dielectric Constant ◽  
Refractive Index ◽  
Surface Plasmon Resonance ◽  
Surface Plasmon ◽  
Plasmon Resonance ◽  
Rf Magnetron Sputtering ◽  
Complex Dielectric Constant ◽  
Thin Film Thickness ◽  
Bilayer Films

ABSTRACTThe effect of tungsten oxide (WO3) thin film thickness on the surface plasmon resonance (SPR) properties have been investigated. WO3 films of varying the thickness (36 nm, 60 nm, 80 nm, 100 nm, 150 nm and 200nm) have been deposited onto Au coated prism (Au/prism) by radio frequency (RF) magnetron sputtering technique. The SPR responses of bilayer films were fitted with the Fresnel’s equations in order to calculate the dielectric constant of WO3 thin film. The variation of complex dielectric constant and refractive index with the thickness of WO3 thin film was studied.

Formation of photo-functional spiroxazine monolayers and their dielectric constant determination using surface plasmon resonance

2005 ◽  
Vol 80 (2) ◽  
pp. 207-211
Author(s):  
Gunwook Park ◽  
Sung-Wook Choi ◽  
Jae-Ho Kim ◽  
Sung-Hoon Kim ◽  
Sam-Rok Keum ◽  
...  
Keyword(s):  
Dielectric Constant ◽  
Surface Plasmon Resonance ◽  
Surface Plasmon ◽  
Plasmon Resonance ◽  
Constant Determination

scholarly journals Kinetic theory of surface plasmon resonance in metal nanoparticles

Surface ◽  
2020 ◽  
Vol 12(27) ◽  
pp. 3-19
Author(s):  
O. Yu. Semchuk ◽  
◽  
O. O. Havryliuk ◽  
A. A. Biliuk ◽  
◽  
...  
Keyword(s):  
Dielectric Constant ◽  
Surface Plasmon Resonance ◽  
Laser Radiation ◽  
Kinetic Equation ◽  
Metal Nanoparticles ◽  
Surface Plasmon ◽  
Plasmon Resonance ◽  
Conductivity Tensor ◽  
Metal Nanoparticle ◽  
Conduction Electrons

In recent years, interest in studying the optical properties of metallic nanostructures has grown. This interest is primarily related to the possibility of practical application of such nanostructures in quantum optical computers, micro- and nanosensors. These applications are based on the fundamental optical effect of surface plasmon excitation. The consequence of this phenomenon is surface plasmon resonance (SPR) - an increase in the cross section of energy absorption by a metal nanoparticle as the frequency of incident light (laser radiation) approaches the SPR frequency of the nanoparticle. Plasmon structures are used to improve the efficiency of thin-film SC. In such structures, metal nanoparticles can primarily act as additional scattering elements for the long-wavelength component of sunlight illuminating SC. As a collective phenomenon, SPR can be described using kinetic approaches, ie using the Boltzmann kinetic equation for the conduction electrons of metal nanoparticles. In this work, the theory of SPR based on the kinetic equation for the conduction electrons of nanoparticles is constructed. to the well-known results derived from the Drude-Sommerfeld theory. Second, the kinetic method makes it possible to study metal nanoparticles with sizes larger or ptical conductivity tensor for spheroidal metal nanoparticles. It is shown that the effect of nanoparticle asymmetry on the ratio of the components of the optical conductivity tensor differs not only smaller than the average electron free path length. The developed theory is used to calculate the oquantitatively but also qualitatively in high-frequency and low-frequency surface scattering. It was found that in metal nanoparticles in a dielectric matrix, under SPR conditions, the full width of the SPR line in a spherical metal nanoparticle depends on both the radius of the particle and the frequency of the electromagnetic (laser) radiation exciting this SPR. It is shown that oscillations of the SPR line width with a change in the dielectric constant of the medium in which they are located can be observed in metal nanoparticles. The magnitude of these oscillations is greater the smaller the size of the nanoparticle and increases significantly with increase. As the radius of the spherical nanoparticle increases, the width of the SPR line decreases significantly and prevails around a certain constant value in media with a higher value of dielectric constant.

Surface Plasmon Resonance Effect of the MoS2/Ag System

2017 ◽  
Vol 898 ◽  
pp. 1857-1861
Author(s):  
Xi Ying Ma ◽  
Hong Ming Mao ◽  
Miao Fei Meng
Keyword(s):  
Dielectric Constant ◽  
Surface Plasmon Resonance ◽  
Surface Plasmon ◽  
Plasmon Resonance ◽  
Incident Angle ◽  
Resonance Effect ◽  
Suitable Material ◽  
Wide Range ◽  
Spr Effect ◽  
Ag Film

Detection of organic materials or heavy ions using the surface plasmon resonance (SPR) effect of the MoS2/Ag system was studies. We found that the reflectivity of the SPR system was sensitive to the incident angle of light, dielectric constant of the detected samples, wavelength of light, and thickness of the Ag film. It reached an extreme minimal value (EMV) at an extreme angle θ. As the dielectric constant of the samples was increased from 1.0 to 3.25, θ increased, enabling high-resolution detection. θ slightly decreased with the thickness of the Ag film changed from 300 to 700 nm for a given detected sample while the EMV of reflectivity increased. Moreover, the reflectivity curves were overlapped when the wavelength of light and the thickness, d of the Ag film both increased from 400 to 700 nm, showing synchronous effect. The results showed that MoS2 was a suitable material for the detection of a wide range of samples and could replace the prism.

scholarly journals Experimental Investigation of the Dielectric Constants of Thin Noble Metallic Films Using a Surface Plasmon Resonance Sensor

Sensors ◽  
2020 ◽  
Vol 20 (5) ◽  
pp. 1505 ◽  
Author(s):  
Longbiao Tao ◽  
Shuo Deng ◽  
Hongyun Gao ◽  
Haifei Lv ◽  
Xiaoyan Wen ◽  
...  
Keyword(s):  
Dielectric Constant ◽  
Refractive Index ◽  
Surface Plasmon Resonance ◽  
Noble Metal ◽  
Surface Plasmon ◽  
Relative Error ◽  
Imaginary Part ◽  
Plasmon Resonance ◽  
Metal Film ◽  
Dielectric Constants

Gold and silver have an extremely low refractive index value of about 0.04 in the visible to near infrared (NIR) regions, and this induces a relative error of about 50% in refractive index measurements. This can lead to a large uncertainty in the imaginary part of the dielectric constants. A large difference exists between the experimental results and the classic models. The surface plasmon resonance (SPR) sensors, which use tens of nanometer thick noble metal film as the sensing layer, show ultra-high sensitivity (reaching 10−8 RIU) in this spectral range. As the spectral sensitivity and amplitude of SPR curves depend on the thickness and the dielectric constant of the sensing layer, we obtained high precision optical constants of the noble metal film using a multi-wavelength angle-modulated SPR sensing technology. The dielectric constant inferred from the parameters of the SPR curves, rather than from the refractive index and absorption ratio of noble metals, introduced a relative error within 10% of the resonance angle measurement. The measurement results demonstrate that the dielectric constants of gold and silver nano-films are more consistent with the widely used experimental results than with the classical theoretical model and always fall in the upper half of the imaginary part of the uncertainty range in the spectra of 500–900 nm.

scholarly journals Study of plasmonic properties of copper monosulfide nanoparticles depending on their dielectric constant

2021 ◽  
Vol 4 (3(60)) ◽  
pp. 9-13
Author(s):  
Iryna Yaremchuk ◽  
Tetiana Bulavinets
Keyword(s):  
Dielectric Constant ◽  
Refractive Index ◽  
Surface Plasmon Resonance ◽  
Surface Plasmon ◽  
Plasmon Resonance ◽  
Localized Surface Plasmon Resonance ◽  
Surrounding Medium ◽  
Localized Surface Plasmon ◽  
Surface Plasmon Resonance Peak ◽  
Plasmon Resonance Peak

The object of research is plasmonic properties copper of monosulfide nanoparticles. One of the most problematic areas is that there is still no unambiguous answer to which main copper monosulfide nanoparticles parameters have a decisive effect on their resonance absorption, scattering or electric field enhancement. It is necessary to study the plasmonic properties of copper monosulfide nanoparticles depending on their main parameter, namely the dielectric constant. The principle of dipole equivalence and Mee-Gans theory for the modeling of the optical nanoparticle characteristics is used. It is found that dielectric constant is a crucial parameter determining the resulting optical response of such nanoparticles. The surrounding medium refractive index affects the position and magnitude of the nanoparticles maximum plasmonic absorption. The nonspherical nanoparticles are characterized by two plasmon peaks corresponding to transverse and longitudinal localized surface plasmon resonance if the ratio between the axes is higher than 1.5. The ellipsoidal nanoparticles exhibit higher sensitivity to changes in the refractive index of the surrounding medium in comparison to the spherical ones. The obtained research results are primarily the basis for further comprehensive research of plasmonic copper monosulfide nanoparticles for their specialized applications. Second, knowledge of the influence of the nanoparticle dielectric constant on their resulting spectral characteristics allow tuning of the localized surface plasmon resonance peak position in a wide wavelength range, from 500 to 1200 nm, using the nanoparticle synthesis technique. Thus, the material under study is promising for sensor applications in a wide spectral range.

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