Chiral structures are promising in many applications,such as biological sensing and analytical chemistry,and have been extensively explored.In this paper,we theoretically investigate the chiral response of twisted bilayer α-MoO3.Firstly,the analytical formula for the transmissivity is derived when the structure is illuminated with circularly polarized plane waves.Furthermore,the results demonstrate that the twisted bilayer α-MoO3 can excite the strong chirality with the maximum circular dichroism(CD)of 0.89.In this case,the chirality is due to the simultaneous breaking the rotational symmetry and mirror symmetry,which originates from the relative rotation of two α-MoO3 layers.To better understand the physical mechanism,the polarization conversion between the left-hand circular polarization(LCP)and right-hand circular polarization(RCP)waves is discussed as well.Moreover,it is found that the structure can maintain the strong chirality(CD＞0.8)when the twisted angle varies from 69° to 80°,which effectively reduces the strictness in the requirement for rotation angle.In addition,the CD can be larger than 0.85 when the incidence angle of circularly polarized plane wave is less than 40°,implying that the chirality is robust against the angle of incidence.Our work not only provides an insight into chirality induced by the twisted bilayer α-MoO3,but also looks forward to applications in biological sensing.

Bi-Yuan Wu;Zhang-Xing Shi;Feng Wu;Ming-Jun Wang;Xiao-Hu Wu

School of Automation and Information Engineering,Xi'an University of Technology,Xi'an 710048,China;Shandong Institute of Advanced Technology,Jinan 250100,China;School of Optoelectronic Engineering,Guangdong Polytechnic Normal University,Guangzhou 510665,China;School of Physics and Telecommunications Engineering,Shaanxi University of Technology,Hanzhong 723001,China

中国物理B（英文版）

[1]Bi-Yuan Wu;Zhang-Xing Shi;Feng Wu;Ming-Jun Wang;Xiao-Hu Wu-.Strong chirality in twisted bilayer α-MoO3)[J].中国物理B（英文版）,2022(04):345-352

transmissivity,strictness

Strong,chirality,twisted,bilayer,MoO3,Chiral,structures,are,promising,many,applications,such,biological,sensing,analytical,chemistry,have,been,extensively,explored,In,this,paper,theoretically,investigate,response,Firstly,formula,derived,when,illuminated,circularly,polarized,plane,waves,Furthermore,results,demonstrate,that,can,excite,strong,maximum,dichroism,CD,case,due,simultaneous,breaking,rotational,symmetry,mirror,which,originates,from,relative,two,layers,To,better,understand,physical,mechanism,polarization,conversion,between,left,hand,LCP,right,RCP,discussed,well,Moreover,found,maintain,angle,varies,effectively,reduces,requirement,addition,larger,than,incidence,less,implying,robust,against,Our,work,not,only,provides,insight,into,induced,by,but,also,looks,forward

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