Abstract
The optical property and the magneto-optical response were space-selectively modified in transparent Fe3+- and Au3+-doped glasses by using infrared femtosecond- (fs-) laser irradiation and subsequent annealing. This irradiation process induces the precipitation of not only magnetic spinel-type Fe-oxide nanoparticles but also Au nanoparticles inside the glasses, which shows localized surface plasmon resonance absorption at the wavelengths larger than 500 nm. As the annealing time and the temperature increases, the position of the LSPR peaks exhibits red shifts, which is due to the growth of Au nanoparticles. Faraday rotation angles as a function of wavelength were measured, and the difference spectra exhibit distinct positive peaks, indicating that the coupling between the LSPR due to the Au nanoparticles and the diamagnetism of the matrix glass is effective. To decrease the coupling with the diamagnetic glass, a two-step annealing process (at 450 °C for 90 min and at 550 °C for 30 min) was carried out after irradiation with fs-laser. The preliminary annealing at the lower temperature contributes to the precipitation of ferrimagnetic magnetite nanoparticles. Au nanoparticles were subsequently grown by annealing at 550 °C. In this case, effective coupling between the LSPR and ferrimagnetic nanoparticles has significantly suppressed the intensity of the positive peak in the Faraday spectra compared with the single annealing process.
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Acknowledgements
This work was financially supported by a Grant-in-Aid for Young Scientists (B) (No. 24760544) from the Ministry of Education, Culture, Sports, Science, and Technology (MEXT), Japan, and by the Murata Science Foundation, and by the Nippon Sheet Glass Foundation for Materials Science and Engineering.
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Nakashima, S., Sugioka, K., Midorikawa, K. et al. Spatially selective modification of optical and magneto-optical properties in Fe- and Au-doped glasses irradiated with femtosecond-laser. Appl. Phys. A 110, 765–769 (2013). https://doi.org/10.1007/s00339-012-7150-9
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DOI: https://doi.org/10.1007/s00339-012-7150-9