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Characterization of the CAuBPs (a) SEM and (b) TEM image of the CAuBPs nanoparticles sample. (c) The geometry of the CAuBPs particle, middle cross-sectional view (left) and side view (right). (d) Extinction spectrum of the CAuBPs.
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Concave gold bipyramids (CAuBPs) exhibit enhanced saturable absorption characteristics due to their large electromagnetic-field enhancement, large third order nonlinearity and fast recovery time. In this paper, the CAuBPs are synthetized through a seed-mediated wet-chemical growth method, and a 1018 nm passively Q-switched fiber laser exploiting CA...
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... electron microscopy (SEM, FEI250, FEI company) and transmission electron mi- croscopy (TEM, Tecnai F20, FEI company) were used to char- acterize the morphology of CAuBPs. Samples for TEM and SEM measurements were drop-dried on carbon coated copper girds and silicon wafers, respectively. The SEM image with a scale bar of 100 nm is shown in Fig. 1(a), the length of the CAuBPs sample along the longitudinal direction is 315 ± 11 nm and 67 ± 3 nm along the transverse direction. The TEM image is shown in Fig. 1(b). To give a more visualized view, geometry of the middle cross-sectional view and side view of the CAuBPs are presented in Fig. 1(c). The middle cross-sectional view is a ...
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... of CAuBPs. Samples for TEM and SEM measurements were drop-dried on carbon coated copper girds and silicon wafers, respectively. The SEM image with a scale bar of 100 nm is shown in Fig. 1(a), the length of the CAuBPs sample along the longitudinal direction is 315 ± 11 nm and 67 ± 3 nm along the transverse direction. The TEM image is shown in Fig. 1(b). To give a more visualized view, geometry of the middle cross-sectional view and side view of the CAuBPs are presented in Fig. 1(c). The middle cross-sectional view is a concave pentagon, and the angle between two adjacent ridges is about 150°. UV-vis spectroscopy (Lambda 750) was used to record extinction spectrum of CAuBPs sample ...
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... The SEM image with a scale bar of 100 nm is shown in Fig. 1(a), the length of the CAuBPs sample along the longitudinal direction is 315 ± 11 nm and 67 ± 3 nm along the transverse direction. The TEM image is shown in Fig. 1(b). To give a more visualized view, geometry of the middle cross-sectional view and side view of the CAuBPs are presented in Fig. 1(c). The middle cross-sectional view is a concave pentagon, and the angle between two adjacent ridges is about 150°. UV-vis spectroscopy (Lambda 750) was used to record extinction spectrum of CAuBPs sample after being washed one time and redispersed to initial volume. The extinc- tion spectrum is depicted in Fig. 1(d), and there exists ...
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... of the CAuBPs are presented in Fig. 1(c). The middle cross-sectional view is a concave pentagon, and the angle between two adjacent ridges is about 150°. UV-vis spectroscopy (Lambda 750) was used to record extinction spectrum of CAuBPs sample after being washed one time and redispersed to initial volume. The extinc- tion spectrum is depicted in Fig. 1(d), and there exists relatively high extinction from 1000 nm to 1200 nm, which covers our operating ...
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... However, the SESAMs suffer from the complicated fabrication procedures and limited operation bandwidth. With the evolving of the low-dimensional materials, different types of SAs have been proposed and adopted in lasers successfully to obtain the pulsed laser output [9][10][11][12][13][14][15][16][17][18][19][20][21][22][23][24][25][26][27]. However, the preparation and transfer processes inevitably lead to poor repeatability and reliability, which will be challenging to find the robust broadband SAs to modulate the pulsed lasers, especially towards the mid-infrared regime. ...
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