Insight into the thermionic emission regimes under gold film thermal relaxation excited by a femtosecond pulse |
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| Authors: | Guangqing DuQing Yang Feng Chen Jinhai SiXun Hou |
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| Institution: | a Key Laboratory for Physical Electronics and Devices of the Ministry of Education and Key Laboratory of Photonics Technology for Informations, Shaanxi Province, School of Electronics and Information Engineering, Xi’an Jiaotong University, No.28, Xianning West Road, Xi’an 710049, PR China
b State Key Laboratory for Manufacturing Systems Engineering, Xi’an Jiaotong University, No. 28, Xianning West Road, Xi’an 710049, PR China |
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| Abstract: | We theoretically investigated different thermal relaxation participating in the ultrafast thermionic emission processes on gold film surface with a femtosecond pulse excitation. The thermionic emission regimes under the two temperature relaxation and the thermal diffusion relaxation were demonstrated. The simulations showed that the thermionic emission properties can be defined in the regime under two temperature relaxation by reducing the laser fluence, or widening the pulse duration or increasing the laser wavelength. It was also found that there exists a transition between the two distinct thermionic emission regimes under peculiar laser parameters of laser fluence, pulse duration and laser wavelength. The results were explained as significant intervene of laser irradiation parameters into gold film thermal relaxation processes. |
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| Keywords: | Femtosecond laser pulse Thermionic emission regimes Two temperature relaxation Thermal diffusion relaxation |
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