Bulg. J. Phys. vol.52 no.4 (2025), pp. 422-434


Aluminum Nanostructures: A New Approach for 355 nm Surface-Enhanced Raman Spectroscopy

P.A. Atanasov1, N.N. Nedyalkov1, A.O. Dikovska1, N. Fukata2, W. Jevasuwan2
1Institute of Electronics, Bulgarian Academy of Sciences, Sofia, Bulgaria
2International Center for Materials for NanoArchitectonics (MANA), National Institute for Materials Science (NIMS), Tsukuba, Japan
Abstract. The ability for surface-enhanced Raman spectroscopy (SERS) study of fluorescent-rhodamine 6G (R6G) and methylene blue (MB) — as well as nonfluorescent (coconut milk) probing chemicals with 355 nm excitation wavelength was demonstrated according to our knowledge for the first time. Aluminum nanostructures (NSs) arrays used were produced by direct pulsed deposition either with ps laser on fused silica substrate or with ns laser decomposition of AlN ceramic surface — all active substrates were produced for the first time. The efficiency of the Al active nanostructures produced on AlN for 355 nm SERS was simulated using the finite difference time domain (FDTD) method. 355 nm SERS was used as an alternative instead of excitation with more high-energetic ultraviolet (UV) or deep ultraviolet (DUV) wavelengths. The increase of the sensitivity of the active alumina substrates was discussed.

doi: https://doi.org/10.55318/bgjp.2025.52.4.422

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