English   español  
Please use this identifier to cite or link to this item: http://hdl.handle.net/10261/235566
Share/Impact:
Statistics
logo share SHARE logo core CORE   Add this article to your Mendeley library MendeleyBASE

Visualizar otros formatos: MARC | Dublin Core | RDF | ORE | MODS | METS | DIDL | DATACITE
Exportar a otros formatos:

Title

Terahertz nanoimaging and nanospectroscopy of chalcogenide phase-change materials

AuthorsChen, Chao; Chen, Shu; Lobo, Ricardo P.S.M.; Maciel-Escudero, Carlos; Lewin, Martin; Taubner, Thomas; Xiong, Wei; Xu, Ming; Zhang, Xinliang; Miao, Xiangshui; Li, Peining; Hillenbrand, Rainer
Issue Date2020
PublisherACS Publications
CitationACS Photonics 7(12): 3499–3506 (2020)
AbstractChalcogenide phase-change materials (PCMs) exhibit optical phonons at terahertz (THz) frequencies, which can be used for studying basic properties of the phase transition and which lead to a strong dielectric contrast that could be exploited for THz photonics applications. Here, we demonstrate that the phonons of PCMs can be studied by frequency-tunable THz scattering-type scanning near-field optical microscopy (s-SNOM). Specifically, we perform spectroscopic THz nanoimaging of a PCM sample comprising amorphous and crystalline phases. We observe phonon signatures, yielding strong s-SNOM signals and, most important, clear spectral differences between the amorphous and crystalline PCM, which allows for distinguishing the PCM phases with high confidence on the nanoscale. We also found that the spectral signature can be enhanced, regarding both signal strength and spectral contrast, by increasing the radius of the probing tip. From a general perspective, our results establish THz s-SNOM for nanoscale structural and chemical mapping based on local phonon spectroscopy.
Publisher version (URL)https://doi.org/10.1021/acsphotonics.0c01541
URIhttp://hdl.handle.net/10261/235566
DOIhttp://dx.doi.org/10.1021/acsphotonics.0c01541
E-ISSN2330-4022
Appears in Collections:(CFM) Artículos
Files in This Item:
File Description SizeFormat 
accesoRestringido.pdf59,24 kBAdobe PDFThumbnail
View/Open
Show full item record
Review this work
 

Related articles:


WARNING: Items in Digital.CSIC are protected by copyright, with all rights reserved, unless otherwise indicated.