Simulation of an optimal radiation injection/extraction optical system for effective tip enhancement of the electromagnetic field in opaque samples

M. A. Trusov^a, A. E. Efimov^b, D. O. Solovyeva^c, I. S. Vaskan^cd, V. A. Oleĭnikov^c, K. E. Mochalov<sup>c

a</sup> State Scientific Center of the Russian Federation - Institute for Theoretical and Experimental Physics, Moscow
^b Research Institute of Transplantology and Artificial Organs
^c M. M. Shemyakin and Yu. A. Ovchinnikov Institute of Bioorganic Chemistry of the Russian Academy of Sciences, Moscow
^d Moscow Institute of Physics and Technology (National Research University), Dolgoprudny, Moscow Region

Abstract: Competitive schemes for constructing an optical system for combining a scanning probe microscope and optical microspectrometer, allowing the study of opaque samples by the method of tip enhancement of the Raman scattering intensity, are considered. Optimal objectives for the implementation of each scheme, taking into account the presence of a scanning microscope probe, are selected. The efficiency of usage of each optical scheme is estimated quantitatively for both excitation of a Raman scattering signal and collecting secondary radiation. As a result, the most effective optical system in terms of "excitation/collection" parameter is revealed.

Keywords: scanning probe microscopy, microspectroscopy, tip enhancement of Raman scattering intensity.

Received: 09.10.2020
Revised: 23.11.2020
Accepted: 27.11.2020

DOI: 10.21883/PJTF.2021.05.50677.18576

 English version: Technical Physics Letters, 2021, 47:3, 252–254

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