期刊
PHOTONICS RESEARCH
卷 9, 期 4, 页码 514-520出版社
CHINESE LASER PRESS
DOI: 10.1364/PRJ.416633
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资金
- National Natural Science Foundation of China [91850109, 61775021, 12004052, 62005022, 11474040]
- Education Department of Jilin Province [JJKH20181104KJ, JJKH20190549KJ, JJKH20190555KJ]
- Changchun University of Science and Technology [XQNJJ-2018-02]
- 111 Project of China [D17017]
The study achieved ultrafast spatiotemporal control of the launch direction of SPP through a plasmonic nano directional coupler; experimental results showed that the extinction ratio of the SPP directional coupler can be optimized by adjusting the amplitude and time delay of the incident light pulses; by adjusting the polarization state of the excitation light, the launch direction of the SPP field can be switched on the femtosecond timescale.
Ultrafast spatiotemporal control of a surface plasmon polariton (SPP) launch direction is a prerequisite for ultrafast information processing in plasmonic nanocircuit components such as ultrafast on -off of plasmonic switching and information recording. Here we realize for the first time, to the best of our knowledge, ultrafast spatiotemporal control of the preferential launch direction of an SPP at the nano-femtosecond scale via a plasmonic nano directional coupler. The spatiotemporal switching of the SPP field was revealed using time-resolved photoemission electron microscopy (TR-PEEM). Experimental results show that the extinction ratio of the SPP directional coupler can be substantially optimized by properly selecting the amplitude and time delay of the two incident light pulses in the experiment. More importantly, we demonstrate a solution for the launch direction of the SPP field, switched in a plasmonic nano directional coupler on the femtosecond timescale, by adjusting the instantaneous polarization state of the excitation light. The TR-PEEM images are supported by finite-difference timedomain (FDTD) simulations. We believe the results of this study can be used to develop high-speed, miniaturized signal processing systems. (C) 2021 Chinese Laser Press.
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