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Description:

It is known that swift heavy ion (SHI) irradiation induces shape elongation of metal nanoparti-cles (NPs) embedded in transparent insulators, which results in anisotropic optical absorption. Here, we report another type of the optical anisotropy induced in CaF2 crystals without including in-tentionally embedded metal NPs. The samples were irradiated with 200 MeV Xe^14+ ions with an incident angle of 45 deg from the surface normal. With increasing the fluence, an absorption band at ~550 nm, which is ascribed to Ca-aggregates, increases both the intensity and the anisotropy. XTEM observation clarified the formation of the continuous line-structures and the discontinu-ous NP chains parallel to the SHI beam.

Rights:

• Creative Commons BY Attribution 4.0 International
  

Keyword: swift heavy ion; CaF2; anisotropic optical absorption; nanoparticles; metal aggregate

Date published: 2024-11-07

Publisher: MDPI AG

Journal:

• Quantum Beam Science (ISSN: 2412382X) vol. 8 issue. 4 29

Funding:

• JSPS-KAKENHI 22K04990
• National Natural Science Foundation of China 12235009

Manuscript type: Publisher's version (Version of record)

MDR DOI:

First published URL: https://doi.org/10.3390/qubs8040029

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Updated at: 2024-11-11 16:30:13 +0900

Published on MDR: 2024-11-11 16:30:14 +0900