Characterization of Nanomaterials by Locally Determining Their Complex Permittivity with Scattering-Type Scanning Near-Field Optical Microscopy
Source abstract
Abstract
Scattering-type scanning near-field optical microscopy (s-SNOM) is currently regarded as a powerful tool for exploring important optical properties at nanoscale resolutions depending only on the size of a sharp tip that is scanned across the sample surface while being excited with a focused laser beam. Recently, it was shown that, among others, s-SNOM can quantitatively map the complex permittivity of materials and biological samples and hence other intrinsic related optical properties, such as the refractive index. In this work we apply this capability, previously demonstrated only at proof-of-concept level, in an experiment dealing with three distinct types of nanostructured materials: microcapsules for drug delivery assembled with layer-by-layer strategies, ultrathin optical coatings with controllable color properties, and plasmonic ceramic nanoparticles. We show that complex permittivity mapping with s-SNOM can contribute to the better understanding of such materials, providing information that is difficult or even impossible to assess with other techniques.
Source: openalex_inverted_index · Quality: baseline
Research context
OpenAlex topics: Near-Field Optical Microscopy · Quantum Dots Synthesis And Properties · Plasmonic and Surface Plasmon Research
SciVX discovery tags are terminology-based. OpenAlex topics are source-provided classifications.
Affiliations
Center for Microscopy-Microanalysis and Information Processing, Politehnica University of Bucharest, Bucharest 060424, Romania
Department of Informatics, Bioengineering, Robotics and Systems Engineering, University of Genoa, Genoa 16126, Italy
Gwangju Institute of Science and Technology, Gwangju, South Korea
International Center for Materials Nanoarchitectonics, National Institute for Materials Science, Tsukuba 305-0044, Japan
Cixi Institute of Biomedical Engineering, CAS Key Laboratory of Magnetic Materials and Devices & Key Laboratory of Additive Manufacturing Materials of Zhejiang Province, Ningbo Institute of Materials Technology and Engineering, Chinese Academy of Sciences, Ningbo 315201, P. R. China
Department of Physics, Politecnico di Milano, Milan 20133, Italy
Funding
Ministry of Science and Technology of the People's Republic of China · National Research Foundation of Korea · Japan Society for the Promotion of Science · Unitatea Executiva pentru Finantarea Invatamantului Superior, a Cercetarii, Dezvoltarii si Inovarii · TEPCO Memorial Foundation
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