摘要：

Depolarization of light backscattered by randomly oriented nonspherical particles. The theory to calculate circular dichroism (CD) of chiral molecules in a finite cluster with arbitrarily disposed objects has been developed by means of T-matrix method. The interaction between chiral molecules and nanostructure has been investigated. Our study focuses

on  the  case  of  chiral  molecules  inserted  into plasmonic  hot  spots  of  nanostructures.  Our

calculations show that the total CD of the system with two chiral molecules is not sum for two

cases when two chiral molecules inserted respectively into the hot spots of nanoparticle clusters

under  the  condition  of  strong  coupling,  although  the  relationship  is  established  at  the  case  of

weak coupling. The structure chirality generally plays a leading role in the CD spectrum for a

hybrid system consisting of molecules and chiral structures. Therefore, the structure chirality has

to  be  overcome  in  order  to  realize  ultrasensitive  probe  of  chiral  information  of  molecules  by

plasmon-based  nanotechnology.  However,  we  find  that  the  structure  chirality  is  very  small  at

plasmon coupling resonance regions for some special chiral structures, the CD spectrum for such

a case can exhibit molecule-induced plasmon chirality. It is very beneficial for the ultrasensitive