0000000000352628

AUTHOR

Kārlis Grundšteins

showing 4 related works from this author

Development of optical WGM resonators for biosensors

2017

Whispering Gallery Mode (WGM) resonators are very sensitive to nanoparticles attaching to the surface. We simulate this process using COMSOL Wave Optics module. Our spherical WGM resonators are produced by melting a tip of an optical fiber and we measure optical Q factors in the 105 range. Molecular oxygen lines of the air in the 760 nm region are used as reference markers when looking for the shifts of the WGM resonance lines. We demonstrate WGM microresonator surface coating with a layer of ZnO nanorods as well as with polystyrene microspheres. Coatings produce increased contact surface. Additional layer of antigens/antibodies will be coated to make high-specificity biosensors.

Optical fiberMaterials sciencebusiness.industryResonancePhysical opticslaw.inventionResonatorSurface coatinglawOptoelectronicsNanorodWhispering-gallery wavebusinessBiosensorBiophotonics—Riga 2017
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Influence of PDA Coating on the Structural, Optical and Surface Properties of ZnO Nanostructures

2020

Polydopamine (PDA) is a new biocompatible material, which has prospects in biomedical and sensor applications. Due to functional groups, it can host wide range of biomolecules. ZnO nanostructures are well known templates for optical sensors and biosensors. The combination of ZnO and PDA results in a change of optical properties of ZnO&ndash

optical sensorsMaterials sciencePhotoluminescenceNanostructureNanocompositeGeneral Chemical Engineeringengineering.materialArticlelcsh:Chemistryfundamental propertiessymbols.namesakeAdsorptionlcsh:QD1-999CoatingChemical engineeringengineeringsymbolsGeneral Materials ScienceDiffuse reflectionZnO–polydopamine nanocompositesFourier transform infrared spectroscopyRaman spectroscopyNanomaterials
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Cavity Ring-Down Spectroscopy measurements of Acetone concentration

2017

This research has been partly supported by the National Research Programme "The next generation of information and communication technologies" (NexIT).

History010308 nuclear & particles physicsHigh reflectivityAnalytical chemistryPulse duration01 natural sciencesSystem a3. Good healthComputer Science ApplicationsEducationCavity ring-down spectroscopychemistry.chemical_compoundchemistry0103 physical sciencesDiode-pumped solid-state laserAcetone:NATURAL SCIENCES:Physics [Research Subject Categories]010306 general physicsSpectroscopy
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Mode family analysis for PMMA WGM micro resonators using spot intensity changes

2021

The whispering gallery modes (WGM) micro resonators are based on elliptical objects, which can be made from optically transparent materials, The geometry of the object enables optical wave circulating inside the ellipse using total internal reflection. If there is a monochromatic light source with constant intensity to the ellipse, constructive interference may be observed. Poly methyl methacrylate acrylic (PMMA) WGM micro resonators are commercially available with typical optical quality factor of 103-104. These could limit problems with WGM micro resonator expensive manufacturing. Thanks to advances in high resolution image processing, read-outs using spectroscopy (single photo detector) …

WavelengthResonatorTotal internal reflectionMaterials scienceOpticsbusiness.industryPhotodetectorImage processingWhispering-gallery wavebusinessRefractive indexVertical-cavity surface-emitting laserLaser Resonators, Microresonators, and Beam Control XXIII
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