Nanoplasmonics and surface enhanced spectroscopy
Design and characterization of substrates for surface-enhancement Raman spectroscopy 
O.M. Hreshchuk1, N.V. Mazur1, O.F. Isaeva1, V.M. Rubish2, V.M. Dzhagan1, V.O. Yukhymchuk1
1 V. Lashkaryov Institute of Semiconductor Physics of NAS of Ukraine, 45, Nauky Avenue, Kyiv-03028, Ukraine.

E-mail: hreshchuk@gmail.com
2 Institute of Information Registration Problems of the National Academy of Sciences of Ukraine, 88000, Uzhhorod, Zamkovi shody Street, Ukraine.

Surface-enhanced Raman spectroscopy (SERS) draws the attention of scientists worldwide by its outstanding opportunities for the detection of ultra-small quantities of molecules, up to single-molecule detection. The core of SERS is a SERS-substrate that possesses numerous near-field antennas for local EM field enhancement by excitation of surface plasmon oscillations.

Fig. 1. Transmission spectra of developed SERS-substrates  and their typical image obtained by AFM.	
Here, effective SERS substrates were developed by using thermal vacuum deposition of gold with in-situ fast, flash annealing for forming of nanoparticles. Precise control of the spectral position of surface-plasmon resonance (Fig. 1), was achieved in-situ during deposition and flash annealing. A comprehensive characterization of surface morphology of developed SERS-substrates was done using microscopy methods, such as SEM and AFM. Thus obtained SERS-substrates allow to obtain the amplification of the Raman signal from organic standard molecules films up to 106 times. 
Acknowledgment’s
Work was supported by the project of National Academy of Science of Ukraine, order of the Presidium of the NAS of Ukraine dated 16.06.2021 №308. Young scientists project “Investigation of ultrathin chalcogenide films by Surface-enhanced Raman spectroscopy”, 2021-2022. This work was partially funded by NRFU (grant # 2020.02-0204) and by NAS of Ukraine project #59/КТ-20-05.