Actions for Femtosecond Laser Enabled Maskless Nanostructure Fabrications and Applications

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Femtosecond Laser Enabled Maskless Nanostructure Fabrications and Applications

Author
Wang, Chao
Published
[University Park, Pennsylvania] : Pennsylvania State University, 2015.
Physical Description
1 electronic document
Additional Creators
Yin, Shizhuo, 1963-
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Open Access.
Summary
Femtosecond laser ablation is quite different when compared to other laser ablation methods due to the ultra-short pulse duration. Two mechanisms, including thermal vaporization and Coulomb explosion, are responsible for femtosecond laser ablation. Nanostructures created by femtosecond laser ablation offer the advantages of having a high efficiency and low cost, which attracted us to investigate the application. The characteristic size of the nanostructures could be varied from several nanometers to several hundred nanometers. Surface enhanced Raman spectroscopy (SERS) was realized on nanostructured copper surface generated by femtosecond laser ablation. An enhancement factor of 863 was achieved, which agreed relatively well with the theoretical analyses found by finite-difference time-domain (FDTD) simulation. In addition, the anti-reflection effect of the nanostructured surface induced by femtosecond laser ablation was studied. The reflectance of the nanostructured silicon surface was reduced to 3% throughout the UV to near IR region (1.1 um) at a large field of view. The ultra-high transmittance of the nanostructured polydimethylsiloxane (PDMS) layer was also measured over the entire range of the visible spectrum and at a large incident angle range of 120 degrees. Finally, a super broadband InGaN/GaN-based light emitting diode (LED) was realized on a nanostructured sapphire substrate. Emission wavelength peaks covering the range between 433 and 519 nm were detected. Furthermore, super broadband emission with a bandwidth of 214 nm was achieved, which basically covered the entire visible spectrum.
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Dissertation Note
Ph.D. Pennsylvania State University 2015.
Reproduction Note
Microfilm (positive). 1 reel ; 35 mm. (University Microfilms 10-609617)
Technical Details
The full text of the dissertation is available as an Adobe Acrobat .pdf file ; Adobe Acrobat Reader required to view the file.
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