Metallic Ca Aggregates Formed Along Ion Tracks and Optical Anisotropy in CaF2 Crystals Irradiated with Swift Heavy Ions

Hiroshi Amekura; Norito Ishikawa; Nariaki Okubo; Feng Chen; Kazumasa Narumi; Atsuya Chiba; Yoshimi Hirano; Keisuke Yamada; Shunya Yamamoto; Yuichi Saitoh

doi:10.3390/qubs8040029

論文 Metallic Ca Aggregates Formed Along Ion Tracks and Optical Anisotropy in CaF2 Crystals Irradiated with Swift Heavy Ions

Hiroshi Amekura ; Norito Ishikawa ; Nariaki Okubo ; Feng Chen ; Kazumasa Narumi ; Atsuya Chiba ; Yoshimi Hirano ; Keisuke Yamada ; Shunya Yamamoto ; Yuichi Saitoh

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Hiroshi Amekura, Norito Ishikawa, Nariaki Okubo, Feng Chen, Kazumasa Narumi, Atsuya Chiba, Yoshimi Hirano, Keisuke Yamada, Shunya Yamamoto, Yuichi Saitoh. Metallic Ca Aggregates Formed Along Ion Tracks and Optical Anisotropy in CaF2 Crystals Irradiated with Swift Heavy Ions. Quantum Beam Science. 2024, 8 (4), 29. https://doi.org/10.3390/qubs8040029

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(abstract)

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.

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