Peculiarities of backscattering from plasmonic dipole nanoantennas embedded in a metallic substrate

Dyshlyuk A.V., Vitrik O.B., Inogamov, N.A.

For Russian citation (Opticheskii Zhurnal):

Дышлюк А.В., Витрик О.Б., Иногамов Н.А. Особенности обратного рассеяния света плазмонными дипольными наноантеннами, утопленными в металлическую подложку // Оптический журнал. 2026. Т. 93. № 4. С. 7–17. http://doi.org/10.17586/1023-5086-2026-93-04-07-17

Dyshlyuk A.V., Vitrik O.B., Inogamov N.A. Peculiarities of backscattering from plasmonic dipole nanoantennas embedded in a metallic substrate [in Russian] // Opticheskii Zhurnal. 2026. V. 93. № 4. P. 7–17. http://doi.org/10.17586/1023-5086-2026-93-04-07-17

For citation (Journal of Optical Technology):

Abstract:

Subject of study. Optical properties of noble metal spherical dipole nanoantenna embedded in a substrate with a hollow gap between the nanoantenna and the substrate material. Aim of study. To study the light scattering properties of the substrate-embedded nanoantenna. Method. Numerical modeling by the finite difference in time domain method. Main results. The backscattering power spectra and radiation patterns of gold spherical nanoantennas, embedded in a gold substrate, were studied as functions of immersion depth, radius, gap width, and ambient refractive index. It was shown that embedding the nanoantenna 90% into the substrate results in a red shift of its dipole resonance by about 400 nm, accompanied by an increase in the backscattered light angular divergence from 34°to 55°. The refractometric sensitivity of the embedded nanoantenna was found to be more than five times higher than that of an isolated nanoantenna in a homogeneous medium. Practical significance. The obtained results can be used to design novel refractometric sensors, as well as in the development of other functional elements of nanophotonics for concentration, amplification and redistribution of the electromagnetic field.

Keywords:

localized plasmon resonance, spherical dipole nanoantenna, scatterer on substrate, refractometery

Acknowledgements:

the work is carried out partly within the state task of IACP FEB RAS (FWFW-2026-0006), and partly within the state task FFWR-2027-0004

OCIS codes: 026.5740, 290.4020, 290.5850

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