Surface-enhanced optical absorption and induced heating in tapered silicon nanoprobe

Izbasarova, E.А., Gazizov, A.R., Kharintsev S.S.

Publication in Journal of Optical Technology

For Russian citation (Opticheskii Zhurnal):

Избасарова Э.А., Газизов А.Р., Харинцев С.С. Поверхностноусиленное оптическое поглощение и индуцированный нагрев конического кремниевого нанозонда // Оптический журнал. 2024. Т. 91. № 5. С. 43–53. http://doi.org/10.17586/1023-5086-2024-91-05-43-53

Izbasarova E.A., Gazizov A.R., Kharintsev S.S. Surface-enhanced optical absorption and induced heating in tapered silicon nanoprobe [in Russian] // Opticheskii Zhurnal. 2024. V. 91. № 5. P. 43–53. http://doi.org/10.17586/1023-5086-2024-91-05-43-53

For citation (Journal of Optical Technology):

Abstract:

Subject of study. The relationship of the heating temperature with the mesoscopic shape of the silicon probe of an atomic force microscope under the influence of medium-intensity laser radiation (5 MW/cm2) and the presence of a rough metal substrate. Aim of study. Quantitative evaluation of a dependence of both the optical field enhancement and induced heating of the tip of a tapered silicon nanoprobe under laser irradiation on the radius of curvature and cone angle of the probe tip, the distance between it and the substrate, and the surface roughness parameter of the gold substrate. Method. The localization of the electromagnetic field in the gap between the vicinity of a silicon nanoantenna and an inhomogeneity on the surface of a gold substrate is simulated using finitedifference time-domain method. As a plasmonic surface, a thin gold coating (thickness up to 50 nm) on the glass substrate is used. Such a coating, due to the excitation of the surface plasmon resonance, enhances the absorption of light and increases the heating temperature of the silicon optical antenna. Main results. The influence of the polarization angle of incident laser radiation on the distribution of the electric field near the tip of the probe is studied. It is found that only the component of the incident light field strength along the direction of the probe axis is enhanced near the tip of the silicon cantilever. The influence of various parameters, including the radius of curvature, the cone angle of the tip of the silicon nanoantenna, the distance between the probe and the substrate, as well as the presence of roughness on the surface of the gold substrate, on the maximum temperature in the region of the tip of the silicon probe is investigated. The probe temperature was found to be decreasing with decreasing cone angle of the probe. Also, the temperature of the tip of the cantilever decreased as the cone angle of the tip of the probe increased. The temperature dependence on the radius of curvature of the tip of a silicon nanoantenna in the presence of a gold substrate was found. With an increase in the size of the roughness of the gold film, the temperature of the tip of the silicon antenna increases, gradually approaching the limit value. Practical significance. The results of the study can be used for optimal selection of the parameters of an experiment using a heated probe. Controlled heating of a silicon probe can be used to study phase transitions in various types of nanomaterials, as well as for local thermochemical nanocatalysis in order to create new structural materials with specified properties.

Keywords:

thermoplasmonics, optical heating, silicon cantilever, plasmon resonance

Acknowledgements:

this work was supported by the Russian Science Foundation, project № 19–12–00066

OCIS codes: 350.5340, 250.5403, 240.6680

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