Optical Nonlinearity of Sputtered Co3O4-SiO2-TiO2 Thin Films
Abstract
Optical non-linearity of cobalt oxide with SiO2-TiO2 additives was investigated, and the change mechanism of the refractive index (n) and extinction coefficient (k), based on the relation between band structure and optical non-linearity of the thin films, was discussed. Refractive index and extinction coefficient of Co3O4 thin films in the ground state were 3.17 and 0.42, respectively. Both n and k decreased by irradiation from a pulse laser with 650 nm of wavelength (1.91 eV). These values in the excited state were 2.91 and 0.41, respectively. n estimated from the change of n and k was -2.8 x 10(exp 11) sq m/W. The film had a band gap corresponding to 2.06 eV, indicating that it was widened by the band filling effect during the laser irradiation at 1.91 eV, and this led to the decrease in absorption coefficient and refractive index.
Document Details
- Document Type
- Technical Report
- Publication Date
- Nov 01, 2001
- Accession Number
- ADP012251
Entities
People
- Hiroki Yamamoto
- Kazuyuki Hirao
- Takashi Naito
Organizations
- Kyoto University