The photonic crystal structure has attracted much attention due to its ability to confine light.In this paper,we present our study on an improved Smith-Purcell radiation from a simple metal photonic crystal excited by moving electrons.Dif-ferent from the wide-band Smith-Purcell radiation from a single metal grating,the results show that the injected electrons could induce more dipole oscillations inside the multi-grating structure,and it leads to the enhancement of the radiation intensity.In addition,there are strong resonances in metal multi-grating structure,and the resonance characteristics may narrow the radiation band,which leads to a radiation with an obvious peak in the spectrum.Therefore,the multi-grating structure has the ability to enhance the radiation intensity and shape the radiation frequency band.By optimizing the struc-ture parameters,coherent and tunable Smith-Purcell radiation can be realized,and it provides a potential way to develop band-controllable light or THz radiation source.

Jing Shu;Ping Zhang;Man Liang;Sheng-Peng Yang;Shao-Meng Wang;Yu-Bin Gong

School of Electronic Science and Engineering,University of Electronic Science and Technology of China,Chengdu 610054,China

中国物理B（英文版）

[1]Jing Shu;Ping Zhang;Man Liang;Sheng-Peng Yang;Shao-Meng Wang;Yu-Bin Gong-.Smith-Purcell radiation improved by multi-grating structure)[J].中国物理B（英文版）,2022(04):362-367

Smith,Purcell,radiation,improved,by,multi,grating,structure,photonic,crystal,has,attracted,much,attention,due,its,ability,confine,light,In,this,paper,we,present,study,from,simple,metal,excited,moving,electrons,Dif,ferent,wide,band,single,results,show,that,injected,could,induce,more,dipole,oscillations,inside,leads,enhancement,intensity,addition,there,are,strong,resonances,characteristics,may,narrow,which,obvious,peak,spectrum,Therefore,shape,frequency,By,optimizing,parameters,coherent,tunable,can,be,realized,provides,potential,way,develop,controllable,THz,source

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