Author:
Ivanina A I,Agafonova D S,Roshina N V,Lamkin I A
Abstract
Abstract
In this paper, by means of numerical simulations in the COMSOL Multiphysics software it’s demonstrated that Raman scattering enhancement can be achieved for the diagnosis of metal oxide films using spherical particles made of barium titanate with a 10-micron diameter sphere. The formation of photonic nanojet in the sphere/film/substrate system at different radiation wavelengths and microsphere refractive index, film, and substrate was studied. The optimal interval of the particle refractive index is n≈1.8-2 was determined, at which the gain occurs directly at the particle/film interface. It is shown that for the UV wavelength range of wavelengths and film thicknesses from 50 to 200 nm, the gain is maximum. For ZnO and PZT films in the perovskite phase, sitall and quartz are preferred as the substrate material, while for PZT in the pyrochlore phase, sapphire is preferred.
Subject
General Physics and Astronomy
Reference18 articles.
1. Photonic nanojets and their applications;Darafsheh;J. Phys. Photonics,2021
2. Super-resolution imaging of a dielectric microsphere is governed by the waist of its photonic nanojet;Yang;Nano Lett.,2016
3. Photonic nanojet enhancement of backscattering of light by nanoparticles: a potential novel visible-light ultramicroscopy technique;Chen;Opt. Express.,2004
4. Enhancement of Raman scattering by individual dielectric microspheres;Du;J. Raman Spectrosc.,2011
5. Photonic nanojet-mediated SERS technique for enhancing the Raman scattering of a few molecules;Das,2016