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논문 기본 정보
- 자료유형
- 학술저널
- 저자정보
- 발행연도
- 2014.12
- 수록면
- 457 - 466 (10page)
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This paper presents an analytic and numerical simulation of the generation and propagation of pico-second ultrasound with nano-scale wavelength, enabling the production of bulk waves in thin films. An analytic model of laser-matter interaction and elasto-dynamic wave propagation is introduced to calculate the elastic strain pulse in microstructures. The model includes the laser-pulse absorption on the material surface, heat transfer from a photon to the elastic energy of a phonon, and acoustic wave propagation to formulate the governing equations of ultra-short ultrasound. The excitation and propagation of acoustic pulses produced by ultra-short laser pulses are numerically simulated for an aluminum substrate using the finite-difference method and compared with the analytical solution. Furthermore, Fourier analysis was performed to investigate the frequency spectrum of the simulated elastic wave pulse. It is concluded that a pico-second bulk wave with a very high frequency of up to hundreds of gigahertz is successfully generated in metals using a 100-fs laser pulse and that it can be propagated in the direction of thickness for thickness less than 100 ㎚.
목차
Abstract
1. Introduction
2. Thermo-Dynamic Equations for Laser Induced Acoustic Pulse
3. Numerical Calculation of 1-D Elastic Wave Propagation
4. Simulation Results and Discussion
5. Conclusions
References
참고문헌 (14)
참고문헌 신청
1. [학술지(정기간행물)] - 김정석 / 2012 / 마이크로/나노 비파괴평가 기술(Ⅰ): 표면 및 표면직하 검사 / 비파괴검사학회지 32 (2) : 198 ~ 209
2. [학술지(정기간행물)] - 김정석 / 2012 / 마이크로/나노 비파괴평가 기술(Ⅱ): 음향특성계측 / 비파괴검사학회지 32 (4) : 418 ~ 430
3. [학술지(정기간행물)] - S. Anisimov. / 1974 / Electron emission from metal surfaces exposed to ultrashort laser pulses / Soviet Phys. JETP 39 (2) : 375 ~ 377
4. [학술지(정기간행물)] - T. Q. Qiu. / 1992 / Short-pulse laser heating on metals / International Journal of Heat and Mass Transfer 35 (3) : 719 ~ 726
5. [학술지(정기간행물)] - B. Bonello. / 1997 / Application of the picosecond ultrasonic technique to the study of elastic and time-resolved thermal properties of materials / Ultrasonics 35 : 223 ~ 231
2. [학술지(정기간행물)] - 김정석 / 2012 / 마이크로/나노 비파괴평가 기술(Ⅱ): 음향특성계측 / 비파괴검사학회지 32 (4) : 418 ~ 430
3. [학술지(정기간행물)] - S. Anisimov. / 1974 / Electron emission from metal surfaces exposed to ultrashort laser pulses / Soviet Phys. JETP 39 (2) : 375 ~ 377
4. [학술지(정기간행물)] - T. Q. Qiu. / 1992 / Short-pulse laser heating on metals / International Journal of Heat and Mass Transfer 35 (3) : 719 ~ 726
5. [학술지(정기간행물)] - B. Bonello. / 1997 / Application of the picosecond ultrasonic technique to the study of elastic and time-resolved thermal properties of materials / Ultrasonics 35 : 223 ~ 231
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UCI(KEPA) : I410-ECN-0101-2016-530-000941440