Biosensing applications of all-dielectric SiO₂-PDMS meta-stadium grating nanocombs

Abstract

Thin film grating meta-stadium nanocombs were fabricated and experimentally investigated for the purpose of glucose monitoring. The method of ellipsometry was used to study the sensitivity of the structure to the alterations in glucose concentration in aqueous solution. The existence of Tamm surface waves was demonstrated at the interface of two dielectric mediums (PDMS and SiO2) with acceptable resolution. The results revealed the best sensitivity achieved at a 48° angle of incidence over 350 − 450 nm visible wavelength span when the glucose concentration was varied in the range of 50 mg/l to 100 mg/l. Though the present work emphasizes on the monitoring of glucose, the structure can be used for sensing applications of other biological fluids as well.

Wideband Microwave Absorber Comprising Metallic Split-Ring Resonators Surrounded With E-Shaped Fractal Metamaterial

“…Metamaterials (MMs) are the artificially engineered mediums, wherein periodically repeated subwavelength-sized metallic or dielectric unit cells are arranged to exhibit unique and exotic electromagnetic (EM) properties [1]- [4]. These find potentials in optical imaging [5], cloaking mediums [6], antennas [7], holography [8], ultra-sensitive sensors [9]- [12], filters [13], [14], perfect absorbers [15]- [18], etc. [19]- [21].…”

Elliptical metallic rings-shaped fractal metamaterial absorber in the visible regime

“…In recent years, optical metamaterials have gained considerable attention in both the engineering and scientific lexicons owing to the exotic electromagnetic (EM) response, that led to varieties of technological applications 1 – 6 . As has been in reports, these artificially engineered materials allow the versatile utility to manipulate the amplitude, phase, and polarization of the incidence radiation at a deep subwavelength scale 7 .…”

“…Within the context, the negative refractive index (RI)-based metasurfaces enable intriguing applications in super lensing 8 , planar filters 3 , optical cloaking 9 , 10 , wavefront manipulation 11 , 12 , optical chirality 13 , medical imaging 14 , and perfect absorption 15 – 17 . These are also tremendously exploited in various other EM applications, namely asymmetric transmission, plasmon-induced transparency, holography, and bio-sensing 6 , 17 – 19 .…”

On the Scattering and Absorption by the SiO2-VO2Core-Shell Nanoparticles Under Different Thermal Conditions

“…Recently, the investigations pivoted to scattering and absorption of waves by specially designed core-shell nanoparticles have become of great attraction [2]- [4]. In general, the use of nanostructured mediums exhibit intriguing changes in the optical, magnetic, electronic, and biomedical properties for different dimensionality conditions, thereby allowing these to be prudent in biosensing, catalytic reactions, biology, material chemistry etc., [5]- [12]. Within the context, their use in bio-imaging and targeted drug delivery, gene delivery etc., [13]- [17] would be of special mention.…”