Zobrazeno 1 - 10
of 162
pro vyhledávání: '"Fritz Keilmann"'
Publikováno v:
Scientific Reports, Vol 11, Iss 1, Pp 1-12 (2021)
Abstract Infrared fingerprint spectra can reveal the chemical nature of materials down to 20-nm detail, far below the diffraction limit, when probed by scattering-type scanning near-field optical microscopy (s-SNOM). But this was impossible with livi
Externí odkaz:
https://doaj.org/article/b8303eac027c4aaba15f72b7d6e69052
Autor:
Sergiu Amarie, Paul Zaslansky, Yusuke Kajihara, Erika Griesshaber, Wolfgang W. Schmahl, Fritz Keilmann
Publikováno v:
Beilstein Journal of Nanotechnology, Vol 3, Iss 1, Pp 312-323 (2012)
Methods for imaging of nanocomposites based on X-ray, electron, tunneling or force microscopy provide information about the shapes of nanoparticles; however, all of these methods fail on chemical recognition. Neither do they allow local identificatio
Externí odkaz:
https://doaj.org/article/30263c283f8d4090b1c591f5d4bc5203
Autor:
Andres de los Santos Pereira, Radoslava Sivkova, Adrian Cernescu, Jan Svoboda, Fritz Keilmann, Ognen Pop-Georgievski, Bogdana Bashta, Iryna Romanenko
Publikováno v:
Analytical Chemistry. 92:4716-4720
Polymer brush coatings are effective in preventing blood coagulation or bacterial attachment, but their chain conformation, while vital for this effect, was never characterized in high spatial resolution. Here, we report mid-infrared spectroscopic na
Publikováno v:
2021 46th International Conference on Infrared, Millimeter and Terahertz Waves (IRMMW-THz).
We report a breakthrough in observing living cells with infrared s-SNOM (scattering near-field microscope).(1, 2) To keep cells "happy" it is mandatory to avoid evaporation, oxygen attack, and mechanical distortion. We reported at IRMMW-THz 2019 that
Publikováno v:
Scientific Reports
Scientific Reports, Vol 11, Iss 1, Pp 1-12 (2021)
Scientific Reports, Vol 11, Iss 1, Pp 1-12 (2021)
Infrared fingerprint spectra can reveal the chemical nature of materials down to 20-nm detail, far below the diffraction limit, when probed by scattering-type scanning near-field optical microscopy (s-SNOM). But this was impossible with living cells
Publikováno v:
Physical Review Research. 2
This work presents a numerical method of analyzing near-field infrared nanospectroscopy experimental data and considers the probe geometry in sufficient detail. Previous methods of analysis in the literature rely on simplifying the probe geometry whi
Publikováno v:
2019 44th International Conference on Infrared, Millimeter, and Terahertz Waves (IRMMW-THz).
We report progress towards sealing alive cells in their native, wet environment by single-layer graphene, where graphene stabilizes the cell by tightly conforming with its surface and thus enables topographic AFM maps of the cell’s surface. Further
Autor:
Sabri Beldi, Mark D. Thomson, Fritz Keilmann, Nicolas Mecklenbeck, Matthias M. Wiecha, Frederik Walla, Hartmut G. Roskos
Publikováno v:
Nanophotonics, Vol 7, Iss 1, Pp 269-276 (2018)
We investigated the excitation of surface plasmon polaritons on gold films with the metallized probe tip of a scattering-type scanning near-field optical microscope (s-SNOM). The emission of the polaritons from the tip, illuminated by near-infrared l
Autor:
Andrés Ayuela, Daniela Priesack, Tobias Gokus, Stefan Wakolbinger, Yasin C. Durmaz, Fabian R. Geisenhof, Takashi Taniguchi, Kenji Watanabe, Marta Pelc, Felix Winterer, R. Thomas Weitz, Jakob Lenz, Raúl Guerrero-Avilés, Fritz Keilmann
Publikováno v:
Digital.CSIC. Repositorio Institucional del CSIC
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The crystal structure of solid-state matter greatly affects its electronic properties. For example, in multilayer graphene, precise knowledge of the lateral layer arrangement is crucial, since the most stable configurations, Bernal and rhombohedral s
Externí odkaz:
https://explore.openaire.eu/search/publication?articleId=doi_dedup___::2d3a357f92c8e2822644644e6d2ff832
http://hdl.handle.net/10261/203065
http://hdl.handle.net/10261/203065
Autor:
Fritz Keilmann
Publikováno v:
2018 43rd International Conference on Infrared, Millimeter, and Terahertz Waves (IRMMW-THz).
We demonstrate 50-nm resolved near-field imaging at λ=500 μm for the first time, using a high-harmonic microwave circuit for emitting/detecting via free space to a standard s-SNOM, and map conductivity contrasts at near single-charge sensitivity.