| Numerical solutions of Green's integral equation for the diffraction of femtosecond laser pulses through a subwavelength aperture |
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| 作者姓名： | 任晓荣 程传福 刘春香 宋洪胜 张宁玉 徐至展 |
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| 作者单位： | Shanghai Institute of Optics and Fine Mechanics，Chinese Academy of Sciences，Shanghai 201800 Department of Physics，Shandong Normal University，Ji'nan 250014，Shanghai Institute of Optics and Fine Mechanics，Chinese Academy of Sciences，Shanghai 201800 Department of Physics，Shandong Normal University，Ji'nan 250014，Department of Physics，Shandong Normal University，Ji'nan 250014，Department of Physics，Shandong Normal University，Ji'nan 250014，Shandong Institute of Architecture and Engineering，Ji'nan 250014，Shanghai Institute of Optics and Fine Mechanics，Chinese Academy of Sciences，Shanghai 201800 |
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| 摘 要： | In this letter, we propose a method for the numerical calculations of the femtosecond laser pulse passed through a subwavelength aperture. The time-dependent laser pulse is decomposed into a series of monochromatic simple harmonic waves. For the light field of the harmonic wave with a single frequency, the numerical calculation is made based on the solution of the Green's integral equation set of the electromagnetic waves. Such numerical solution is iterated for all the waves with different frequencies, and all the numerical solutions are transformed into the light fields in the time domain by inverse Fourier transform. The light intensity distributions transmitted the subwavelength aperture are calculated and the results show the propagation of the light field is along the direction of the medium interface.
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