Optical Properties and Optimization of LaB6 Thin Films for Photothermal Applications

The growth of highly crystalline LaB6 films with an excellent optical response and low loss is reported, which will be useful for high‐performance photothermal device applications when combined with their inherent refractory properties. Optimum growth parameters for realizing uniaxial and coherent L...

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Bibliographic Details
Published in:Advanced optical materials 2022-04, Vol.10 (8), p.n/a
Main Authors: Sugavaneshwar, Ramu Pasupathi, Handegård, Ørjan Sele, Doan, Anh Tung, Ngo, Thien Duc, Tran, Toan Phuoc, Ngo, Hai Dang, Dao, Thang Duy, Ishii, Satoshi, Otani, Shigeki, Nagao, Tadaaki
Format: Article
Language:English
Subjects:
ceramics
crystal growth
Electromagnetic fields
infrared plasmonics
lanthanum hexaboride
Materials science
Nanostructure
Optical properties
Optics
Optimization
Thin films
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Summary:The growth of highly crystalline LaB6 films with an excellent optical response and low loss is reported, which will be useful for high‐performance photothermal device applications when combined with their inherent refractory properties. Optimum growth parameters for realizing uniaxial and coherent LaB6 thin films, exhibiting an excellent plasmonic response for near‐ to mid‐infrared device applications, are established. Numerical electromagnetic simulations of the epitaxial LaB6 nanostructures revealed that the electromagnetic field at the LaB6 surface can be as high as that of the Au nanostructures. Furthermore, the LaB6 nanostructures show resonance in the visible (red) to mid‐infrared region comparable to those of Au with the added advantage of improved temperature stability that can withstand harsh photothermal device operations. Correlation between the optical properties and the growth conditions of LaB6 thin films is reported. Optimum growth parameters for realizing uniaxial and coherent LaB6 thin films with excellent plasmonic response in the infrared region is found. The LaB6‐based nanostructures exhibit performances close to those of Au with an added advantage of higher temperature stability suitable for photothermal device applications.
ISSN:2195-1071
2195-1071
DOI:10.1002/adom.202101787