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Ordered YBCO sub-micron array structures induced by pulsed femtosecond laser irradiation
1Department of Electrophysics, National Chiao-Tung University, Hsinchu, Taiwan, ROC. cwluo@mail.nctu.edu.tw
Optics Express
|December 10, 2008
Summary
Femtosecond laser pulses create organized sub-micron Yttrium Barium Copper Oxide (YBCO) dots on YBCO films. The dot morphology is controllable by adjusting laser fluence, yielding arrays with a critical temperature of 89.7 K.
Area of Science:
- Materials Science
- Nanotechnology
- Superconductivity
Background:
- Yttrium Barium Copper Oxide (YBCO) is a high-temperature superconductor.
- Controlling the morphology of thin films is crucial for device applications.
Purpose of the Study:
- To investigate the formation of organized sub-micron YBCO dots using femtosecond laser irradiation.
- To determine the influence of laser fluence on the morphology of YBCO films.
Main Methods:
- YBCO films prepared by pulse laser deposition were irradiated with femtosecond laser pulses.
- Laser fluences ranged from 0.21 to 0.53 J/cm(2).
- Surface morphology was analyzed using scanning electron microscopy (SEM) and atomic force microscopy (AFM).
Main Results:
- At a laser fluence of approximately 0.21 J/cm(2), periodic ripples with sub-micrometer spacing were observed.
- Increasing the laser fluence to 0.26 J/cm(2) resulted in organized sub-micron dots (100-800 nm diameter, 150 nm height).
- Higher fluences (over 0.32 J/cm(2)) led to massive melting and irregular morphology.
Conclusions:
- Femtosecond laser irradiation offers a method for controlled fabrication of YBCO sub-micron dots.
- The study demonstrates tunable morphology control of YBCO films by laser fluence.
- Arrays of YBCO sub-micron dots with a critical temperature (Tc) of 89.7 K were successfully fabricated.
