Mr. Mykola Biednov Profile

Mykola Biednov

at National Taras Shevchenko Univ of Kyiv

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Proceedings Article | 5 May 2015 Paper

Gold and aluminum based surface plasmon resonance biosensors: sensitivity enhancement

Mykola Biednov, Tatyana Lebedeva, Pavel Shpilovuy

Proceedings Volume 9506, 95061P (2015) https://doi.org/10.1117/12.2177992

KEYWORDS: Sensors, Dielectrics, Oxides, Waveguide modes, Spectral resolution, Gold, Refractive index, Aluminum, Metals, Reflectivity

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In this work we considered Gold and Aluminum thin films coated with additional dielectric layers as sensing platforms. Operation of these sensors is based on measuring shift in the position of the reflectivity dip in angular reflectivity spectrum of the sample. Shift can be caused by changes in the refraction index of either liquid that interacts with sensors surface (refractometric measurements) or thin adjacent biolayer on top of the sensor due to immobilization of the target molecules (biosensing). Calculations based on Fresnel equations and transfer matrix formalism allowed us to make comprehensive analysis of the angular sensitivity, shape of the reflectivity dip and dynamic range of the sensors with different dielectric coatings. Calculations were performed for both cases of bio and refractometric sensing. Results showed different dependence of the sensitivity of Au an Al based sensors upon refraction index of the dielectric coating. For Au-based surface Plasmon resonance sensor up to two times increased sensitivity can be achieved using dielectric coating with high refraction index 2.3 of proper thickness. For sensors based on aluminum we were able to achieve 50% increased angular sensitivity. At the same time width of the reflectivity dip increased proportionally to the optical thickness of the dielectric coating. For estimating sensors quality we analyzed ratio of the angular sensitivity to the width of the reflectivity dip. This ratio decreased with increase in optical thickness of the dielectric, however angular sensitivity of the sensor increased significantly. Deposition of the additional dielectric layer with high refraction index such as Niobium Oxide can also improve chemical and mechanical stability of the sensor.

Proceedings Article | 10 October 2012 Paper

Peculiarities of optical response of silver-based metal-dielectric thin films

Mykola Biednov, Leonid Poperenko, Irina Yurgelevych

Proceedings Volume 8465, 84651D (2012) https://doi.org/10.1117/12.950718

KEYWORDS: Silver, Dielectrics, Particles, Nanoparticles, Absorption, Plasmons, Metals, Refraction, Optical properties, Composites

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Optical properties and effective dielectric function of nanostructured materials consisting of silver nanoparticles embed in dielectric matrix were studied. Experimental part was performed by means of angular and spectroscopic ellipsometry. Measured angular dependences reveal, that optical conductivity changes from metallic to dielectric with decrease of silver volume fraction. Complex effective dielectric function of the samples was measured within 295-825 nm wavelength range. Dispersion of optical constants of the samples with high silver volume fractions f<0.53 appears to be qualitatively similar to bulk silver. With decrease of Ag concentration influence of plasmon resonance on optical properties of the samples is observed. Measured spectral dependences reveal redshift and significant broadening of plasmon resonance peak of sample with f=0.28 in comparison to those with f=0.06-0.15 which can be explained within framework of surface plasmon resonance theory. Calculations show, that experimental data can’t be described using standard Maxwell-Garnett and Bruggeman effective-medium theories. Effective dielectric function of such composite films can be tuned by varying silver concentration, size and shape of the metal particles. We show that measured values of complex index of refraction for samples with f=0.08-0.2 can guarantee a strong light absorption for 400 nm film thickness according to Fresnel equations and demonstrate, that a considerable fraction of light can be trapped in the film due to total internal reflection of the light, scattered by noble metal nanoparticles.

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