Spatial modulation spectroscopy of graphene sheets

Autor:	Gregory V. Hartland, Shun S. Lo, Vaishnav Murthy, Zhongming Li, Nicolas Havard
Rok vydání:	2014
Předmět:	chemistry.chemical_classification Materials science business.industry Graphene General Physics and Astronomy Polymer Spatial modulation Signal Reflectivity law.invention Optics chemistry law Optoelectronics Physical and Theoretical Chemistry Thin film business Spectroscopy Graphene nanoribbons
Zdroj:	The Journal of Chemical Physics. 140:074203
ISSN:	1089-7690 0021-9606
DOI:	10.1063/1.4865833
Popis:	Two different samples of graphene, multi-layer flakes on Si/SiO2 substrates and single layer graphene on glass, have been examined by reflectivity contrast and spatial modulation spectroscopy measurements. For the multi-layer graphene flakes, the reflectivity contrast and spatial modulation spectroscopy measurements are in good agreement, validating the application of spatial modulation spectroscopy to two-dimensional samples. The measurements for single layer graphene on glass show features that correspond to increases and decreases in reflectivity. The features with increased reflectivity are assigned to small regions of multilayer graphene or polymer, and the features with decreased reflectivity are assigned to holes in the graphene film. Using a model for thin film reflectivity we calculate the size dependent spatial modulation signal for the holes, and find that a significant number of holes have a larger than expected signal. This could arise from the presence of multi-layers of graphene in the sample, or because of optical resonance effects for the holes.
Databáze:	OpenAIRE
Externí odkaz:	https://explore.openaire.eu/search/publication?articleId=doi_dedup___::5a4897baab111faf6e4c0c17b022bc09 https://doi.org/10.1063/1.4865833 Zobrazit plný text záznamu