2016/10/13 by Samuel M. Hornett, Rayko I. Stantchev, Martha Z. Vardaki +3
Engineering · Materials Science · Physics and Astronomy · #Far-infrared laser #Graphene #Graphene research and applications #Laser #Materials science #Molecular Junctions and Nanostructures #Nanotechnology #Nanowire Synthesis and Applications #Optics #Optoelectronics #Photoconductivity #Physics #Terahertz metamaterials #Terahertz radiation #cond-mat.mes-hall #physics.optics
paper · pdf · doi:10.1021/acs.nanolett.6b03168
openalex publication_date 2016/10/13 · arxiv created 2016/10/21 · arxiv updated 2016/10/24 · openalex created_date 2025/10/10 · openalex updated_date 2026/08/06
Using a spatially structured, optical pump pulse with a terahertz (THz) probe pulse, we are able to determine spatial variations of the ultrafast THz photoconductivity with subwavelength resolution (75 μm ≈ λ/5 at 0.8 THz) in a planar graphene sample. We compare our results to Raman spectroscopy and correlate the existence of the spatial inhomogeneities between the two measurements. We find a strong correlation with inhomogeneity in electron density. This demonstrates the importance of eliminating inhomogeneities in doping density during CVD growth and fabrication for photoconductive devices.