A 22-stage 4 MV laser-triggered multistage multi-channel switch （LTS） was designed according to the hypothesis that the well-proportioned electrical field distribution is helpful in reducing the jitter of delay. Fie...A 22-stage 4 MV laser-triggered multistage multi-channel switch （LTS） was designed according to the hypothesis that the well-proportioned electrical field distribution is helpful in reducing the jitter of delay. Field distribution in the switch section is regulated by a metal field regulation ring and several gradient rings. In order to reduce the jitter further, a SFB/N2 mixture is chosen as the switching medium. The generalized standard deviation of the self-breakdown voltage and the deviation of the average value from the prediction is less than 4.4% and 13% respectively. Linearity of the self-breakdown voltage is better than 0.95. Triggered by a laser pulse of 35 mJ/3 ns, the delay is about 26 ns at a working voltage of 85±3% USB （Self-breakdown Voltage）. Maximum deviation of delay is less than =t=2.5 ns. Jitter is less than 1.5 ns. The delay and jitter decrease with the increase in the working ratio （the ratio of working voltage to USB）, pressure or voltage.展开更多
Shape memory materials possess programmable complex and large deformations towards external stimuli,which are particularly essential for their potential applications.For the transformation of planar two-dimensional(2D...Shape memory materials possess programmable complex and large deformations towards external stimuli,which are particularly essential for their potential applications.For the transformation of planar two-dimensional(2D)structures into complex 3D structures,the design of asymmetric or bilayer thin sheets is usually required.In this paper,we propose a facile strategy to achieve these complex 3D structures that can be transformed to various pre-determined shapes sequentially by laser-triggered site-specific deformations.The response of shape memory polycaprolactone(PCL)to laser is realized by physically dopingW18O49 nanowires into the cross-linked PCL diacrylate matrix.When irradiated by 98 mW cm^(−2)laser,the pre-stretched PCL/W_(18)O_(49)film shows an out-of-plane bending deformation due to the temperature gradient and single-domain orientation on the thickness between the upper layer and lower layer.The bending rates and amplitudes of the film can be tailored by adjusting the parameters of irradiation time,the film thickness as well as the pre-stretch strain.Remarkably,the pre-stretched film can automatically bend in more intricate complex deformations by integration with kirigami cuts in planar.Finally,we demonstrate that by activating the dynamic transesterification reaction within the same film,it can also achieve the 2D-to-3D transformations.With these decent features,this kind of novel PCL//W_(18)O_(49)film shows great potential in the field of biomedical devices or soft robotics.展开更多
文摘A 22-stage 4 MV laser-triggered multistage multi-channel switch （LTS） was designed according to the hypothesis that the well-proportioned electrical field distribution is helpful in reducing the jitter of delay. Field distribution in the switch section is regulated by a metal field regulation ring and several gradient rings. In order to reduce the jitter further, a SFB/N2 mixture is chosen as the switching medium. The generalized standard deviation of the self-breakdown voltage and the deviation of the average value from the prediction is less than 4.4% and 13% respectively. Linearity of the self-breakdown voltage is better than 0.95. Triggered by a laser pulse of 35 mJ/3 ns, the delay is about 26 ns at a working voltage of 85±3% USB （Self-breakdown Voltage）. Maximum deviation of delay is less than =t=2.5 ns. Jitter is less than 1.5 ns. The delay and jitter decrease with the increase in the working ratio （the ratio of working voltage to USB）, pressure or voltage.
文摘Shape memory materials possess programmable complex and large deformations towards external stimuli,which are particularly essential for their potential applications.For the transformation of planar two-dimensional(2D)structures into complex 3D structures,the design of asymmetric or bilayer thin sheets is usually required.In this paper,we propose a facile strategy to achieve these complex 3D structures that can be transformed to various pre-determined shapes sequentially by laser-triggered site-specific deformations.The response of shape memory polycaprolactone(PCL)to laser is realized by physically dopingW18O49 nanowires into the cross-linked PCL diacrylate matrix.When irradiated by 98 mW cm^(−2)laser,the pre-stretched PCL/W_(18)O_(49)film shows an out-of-plane bending deformation due to the temperature gradient and single-domain orientation on the thickness between the upper layer and lower layer.The bending rates and amplitudes of the film can be tailored by adjusting the parameters of irradiation time,the film thickness as well as the pre-stretch strain.Remarkably,the pre-stretched film can automatically bend in more intricate complex deformations by integration with kirigami cuts in planar.Finally,we demonstrate that by activating the dynamic transesterification reaction within the same film,it can also achieve the 2D-to-3D transformations.With these decent features,this kind of novel PCL//W_(18)O_(49)film shows great potential in the field of biomedical devices or soft robotics.
