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Abstract_Venugopal Rao SOMA
Ultrashort (femtosecond/picosecond) laser pulses have demonstrated a strong potential in ablation/processing/nanofabrication of various materials, including metals, semiconductors, polymers, etc. We have utilized the ultrashort pulse laser ablation (in air/liquids) technique for creating diverse nanoparticles/nanostructures of Ag, Au, Ag-Au, Au-Cu, Ag-Au-Cu, Si, Ge, GaAs, SiC, InP, high-entropy alloys, two-dimensional materials (TMDCs, MXenes, few-layer graphene), along with hybrid nanomaterials (e.g., Ag-Au/Si, Ag-Au/Ge nanostructures, etc.) [1-21]. We could engineer several surface nanostructures and achieve diverse nanocolloids using these short pulses by varying the focusing conditions (Gaussian, Bessel, Vortex, etc.), surrounding atmosphere, pulse duration, input energies, and the number of incident pulses. We have also investigated the utility of these versatile nanostructures for detecting trace explosives (AN, PA, RDX, HMX, NTO, TNT, etc.), biomolecules, pesticides (thiram, thiabendazole), and organic dyes using the surface-enhanced Raman scattering (SERS) technique. We will discuss the physics of these processes also present other potential applications of these versatile nanomaterials in photonics, optoelectronics, wetting, etc.