| Summary: | 碩士 === 國立清華大學 === 光電工程研究所 === 104 === In this work, we used finite-difference time-domain (FDTD) numerical analysis to investigate the generation of nonlinear response (second harmonic generation, SHG) by surface plasmonics on the two-wire transmission line (TWTL), including the mode type of propagating nonlinear signals, the effect of different input fundamental mode type on the generation of SHG.
We used focused ion beam milling to fabricate the samples which deposited on the glass substrate, and in the experiment, we used our home-made confocal microscope and the other optical system. A pulse laser with center wavelength 1560 nm and about 60 fs pulse duration is focused on the spot at the end of TWTL and NIR CCD camera is used to observe the position of fundamental emission spot. As for SHG signal, we used EMCCD to observe it, and we also used the spectrometer to detect the spectrum of SHG signal. Finally, we found that despite the input fundamental mode is different, the mode type of generated SHG signals are both TM mode.
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