Deep Subwavelength Laser-Induced Periodic Surface Structures on Silicon as a Novel Multifunctional Biosensing Platform

• DOI: 10.1021/acsami.1c16249
• Publication Date: 2021-11-02T21:53:42Z
• Authors: Yulia Borodaenko; Sergey Syubaev; Stanislav Gurbatov; Alexey Zhizhchenko; Aleksey Porfirev; Svetlana Khonina; Eugeny Mitsai; Andrey V. Gerasim...; Alexander Shevlyagin; Evgeny Modin; Saulius Juodkazis; Evgeny L. Gurevich; Aleksandr A. Kuch...
• Keywords: Laser Ablation

Strong light localization inside the nanoscale gaps provides remarkable opportunities for creation of various medical and biosensing platforms stimulating an active search inexpensive easily scalable fabrication at a sub-100 nm resolution. In this paper, self-organized laser-induced periodic surface structures (LIPSSs) with shortest ever reported periodicity 70 ± 10 were directly imprinted on crystalline Si wafer upon its direct femtosecond-laser ablation in isopropanol. Appearance such morphology was explained by formation topography photoexcited driven interference phenomena as well subsequent down-scaling grating period via Rayleigh-Taylor hydrodynamic instability. The produced deep subwavelength LIPSSs demonstrate strong anisotropic anti-reflection performance, ensuring efficient delivery incident far-field radiation to electromagnetic "hot spots" localized nanogaps. This allows realization optical operating interactions quantum emitters fields. demonstrated 80-fold enhancement spontaneous emission from attached nanolayer organic dye molecules situ tracing catalytic molecular transformations substantiate bare metal-capped promising multifunctional platform.