Microellipsometric investigation of ordered plasmonic nanostructures
Final Report Abstract
The project aimed at addressing pending scientific challenges, namely interactions between localized and surface plasmons and lattice modes. This includes the conditions of mode splitting and creation of Fano lines in the spectra, particularly: the influence of the form-factor and orientation of lattices on the optical properties of the investigated systems; deviation of optical properties of ordered nanostructures from ones predicted by effective-medium approximations; and looking for modes most effective for sensing and field enhancement purposes. All these issues were addressed and investigated by micro-ellipsometry and other darkfield and brightfield optical spectroscopic methods as well as theoretical modelling. Sequential account of all dipolar interactions in the systems of interest allowed shining light on the evolution of optical properties of plasmonic nanostructures due to different interactions. Also, it was demonstrated that the optical properties of ordered layers of nanoparticles depend on the angle of incidence of the exciting light as well as the mutual orientation of the plane of incidence and the lattice. Comparison of the theory with experiment reveals the influence of surface plasmons on interparticle interactions. Analysis of the resonances in ellipsometric spectra allowed proposing a way of qualitative interpretation of ellipsometric spectra. Direct measurement of surface-enhanced Raman scattering clearly demonstrates the main mechanism of the enhancement by plasmons of the system.
Publications
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Microellipsometry study of plasmonic properties of metal–insulator–metal structures with ordered lattices of nanoparticles. Journal of Applied Physics, 129(12).
Bortchagovsky, E.; Demydenko, Yu.; Bogoslovskaya, A.; Tang, J.; Dai, F.; Fleischer, M.; Milekhin, I.; Sharma, A.; Salvan, G. & Zahn, D. R. T.
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Erratum: “Microellipsometry study of plasmonic properties of metal-insulator-metal structures with ordered lattices of nanoparticles” [J. Appl. Phys. 129, 123104 (2021)]. Journal of Applied Physics, 131(4).
Bortchagovsky, E.; Demydenko, Yu.; Bogoslovskaya, A.; Tang, J.; Dai, F.; Fleischer, M.; Milekhin, I.; Sharma, A.; Salvan, G. & Zahn, D. R. T.
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Exhibition of a film’s resonances in ellipsometric spectra and the Berreman effect. Applied Optics, 62(4), 904.
Bortchagovsky, Eugene & Mishakova, Tetiana
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Micro-ellipsometry of square lattices of plasmonic nanodiscs on dielectric substrates and in metal-insulator-metal configurations. Micro and Nano Engineering, 18, 100172.
Bortchagovsky, Eugene; Simo, P. Christian; Milekhin, Ilya; Tang, Jia; Zahn, Dietrich R.T. & Fleischer, Monika
