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2022 ◽  
Vol 151 ◽  
pp. 106872
Yan Song ◽  
Bodong Peng ◽  
Qing Xu ◽  
Guzhou Song ◽  
Zhiqin Yue ◽  

2022 ◽  
Vol 149 ◽  
pp. 107821
Xiaolan Li ◽  
Changping Xu ◽  
Yuanzheng Li ◽  
Feng Wu ◽  
Kailiang Zhang ◽  

ACS Photonics ◽  
2022 ◽  
Lu He ◽  
Furong Zhang ◽  
Huizhen Zhang ◽  
Ling-Jun Kong ◽  
Weixuan Zhang ◽  

2022 ◽  
Yiwei Li ◽  
Ning An ◽  
Zheyi Lv ◽  
Yucheng Wang ◽  
Bing Chang ◽  

Abstract Surface plasmons in graphene provide a compelling strategy for advanced photonic technologies thanks to their tight confinement, fast response and tunability. Recent advances in the field of all-optical generation of graphene’s plasmons in planar waveguides offer a promising method for high-speed signal processing in nanoscale integrated optoelectronic devices. Here, we use two counter propagating frequency combs with temporally synchronized pulses to demonstrate deterministic all-optical generation and electrical control of multiple plasmon polaritons, excited via difference frequency generation (DFG). Electrical tuning of a hybrid graphene-fiber device offers a precise control over the DFG phase-matching, leading to tunable responses of the graphene’s plasmons at different frequencies and provides a powerful tool for high-speed logic operations. Our results offer new insights for plasmonics on hybrid photonic devices based on layered materials and pave the way to high-speed integrated optoelectronic computing circuits.

2022 ◽  
Vol 5 (1) ◽  
Jie Zhao ◽  
Yan-Ting Hu ◽  
Yu Lu ◽  
Hao Zhang ◽  
Li-Xiang Hu ◽  

AbstractGeneration of energetic electron-positron pairs using multi-petawatt (PW) lasers has recently attracted increasing interest. However, some previous laser-driven positron beams have severe limitations in terms of energy spread, beam duration, density, and collimation. Here we propose a scheme for the generation of dense ultra-short quasi-monoenergetic positron bunches by colliding a twisted laser pulse with a Gaussian laser pulse. In this scheme, abundant γ-photons are first generated via nonlinear Compton scattering and positrons are subsequently generated during the head-on collision of γ-photons with the Gaussian laser pulse. Due to the unique structure of the twisted laser pulse, the positrons are confined by the radial electric fields and experience phase-locked-acceleration by the longitudinal electric field. Three-dimensional simulations demonstrate the generation of dense sub-femtosecond quasi-monoenergetic GeV positron bunches with tens of picocoulomb (pC) charge and extremely high brilliance above 1014 s−1 mm−2 mrad−2 eV−1, making them promising for applications in laboratory physics and high energy physics.

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