Plasmon-shaped polarization gating for high-order-harmonic generation

被引:4
|
作者
Wang, Feng [1 ,2 ]
He, Lixin [1 ,2 ]
Chen, Jiawei [1 ,2 ]
Wang, Baoning [1 ,2 ]
Zhu, Xiaosong [1 ,2 ]
Lan, Pengfei [1 ,2 ]
Lu, Peixiang [1 ,2 ,3 ]
机构
[1] Huazhong Univ Sci & Technol, Sch Phys, Wuhan 430074, Hubei, Peoples R China
[2] Huazhong Univ Sci & Technol, Wuhan Natl Lab Optoelect, Wuhan 430074, Hubei, Peoples R China
[3] Wuhan Inst Technol, Lab Opt Informat Technol, Wuhan 430205, Hubei, Peoples R China
基金
中国国家自然科学基金;
关键词
BROAD-BAND; PULSES; FIELD;
D O I
10.1103/PhysRevA.96.063418
中图分类号
O43 [光学];
学科分类号
070207 ; 0803 ;
摘要
We present a plasmon-shaped polarization gating for high-order-harmonic generation by using a linearly polarized laser field to illuminate two orthogonal bow-tie nanostructures. The results show that when these two bow-tie nanostructures have nonidentical geometrical sizes, the transverse and longitudinal components of the incident laser field will experience different phase responses, thus leading to a time-dependent ellipticity of laser field. For the polarizing angle of incident laser field in the range from 45 degrees to 60 degrees, the dominant harmonic emission is gated within the few optical cycles where the laser ellipticity is below 0.3. Then sub-50-as isolated attosecond pulses (IAPs) can be generated. Such a plasmon-shaped polarization gating is robust for IAP generation against the variations of the carrier-envelope phases of the laser pulse. Moreover, by changing the geometrical size of one of the bow-tie nanostructures, the electron dynamics can be effectively controlled and the more efficient supercontinuum as well as IAP can be generated.
引用
收藏
页数:6
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