Fabrication of Periodic Au nanoparticle array and its study of Nonlinear Optical properties
| Autor: | Tzeng-Tsong Wu, 吳政璁 |
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| Druh dokumentu: | 學位論文 ; thesis |
| Popis: | 97 In this thesis, we study nonlinear optical properties of different periodic metallic nanoparticle arrays by using Nanosphere Lithography (NSL). Nonlinear optical properties would be enhanced because of surface plasma resonance which is generated by AuFON (Au Film Over Nanosphere) structure. In experiments, AuFON structure was fabricated with different size (430nm~1500nm) and thickness (16nm~50nm). UV-Visible Spectrometer shows surface plasma resonance dip at 750nm when the Au film is 50nm thick and the polystyrene nanosphere is 500nm in diameter. The nonlinear optical properties of AuFON structure were observed by Z-Scan measurement with different wavelengths (710nm~790nm) under different laser powers, and we have used the Ti: sapphire femtosecond laser (pulse duration 70fs, repetition rate 80MHz.) as the light source. Large nonlinear absorption and refraction coefficients induced by AuFON due to surface plasma resonance of the excited wavelength is 790nm with laser average power of 0.1mw. The calculated nonlinear absorption coefficient β and nonlinear refraction coefficient γ are -8.8×10-4 (m/w) and -9.2×10-9 (m2/w). In addition, AuFON/ZnO structure was also measured with different incident wavelengths. The nonlinear absorption coefficient β and nonlinear refraction coefficient γ in wavelength 770nm are -6.3×10-4 (m/w) and 1.2×10-9 (m2/w). AuFON structure shows great potential in nonlinear optical devices in the future. |
| Databáze: | Networked Digital Library of Theses & Dissertations |
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