Publications by authors named "George Kourmoulakis"
Article Synopsis
- Nanoscale-engineered surfaces can create controlled strain in 2D materials, like WS, which may enhance photonic applications and quantum information processing.
- This study explores how texture-induced strain in single-layer WS on a specific substrate (Si/SiO) affects its optical properties, using techniques such as Atomic Force Microscopy and Raman spectroscopy.
- Findings reveal that suspended WS areas maintain circular polarization at higher temperatures compared to supported regions, emphasizing the importance of substrate choice for the performance of 2D materials in optoelectronic devices.
Article Synopsis
- Two-dimensional graphene and graphene-related materials show potential for future electronics due to their unique properties that can be enhanced through substrate-induced strain.
- Strain affects interatomic distances and electronic properties, leading to the emerging field of straintronics, which allows for new functionalities in devices.
- The study employs Polarization-resolved Second Harmonic Generation (P-SHG) imaging to map strain distribution in a WS monolayer on a specially patterned substrate, confirming findings with atomic force microscopy and Raman mapping.
Experimental results are presented on laser-assisted synthesis of composite nanoparticles of perovskite BaTiO with gold nanoparticles using the technique of laser ablation in water and aqueous solution of hydrogen peroxide. Nanoparticles of BaTiO are generated by near IR laser radiation with pulse durations of 170 fs, 1 ps, and 200 ns. Nanoparticles of barium titanate BaTiO (BTO) have tetragonal structure for all used pulse durations.
View Article and Find Full Text PDFStacked atomically thin transition metal dichalcogenides (TMDs) exhibit fundamentally new physical properties compared to those of the individual layers. The twist angle between the layers plays a crucial role in tuning these properties. Having a tool that provides high-resolution, large area mapping of the twist angle, would be of great importance in the characterization of such 2D structures.
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