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物理学院“博约学术沙龙”系列报告第84期

发布日期:2014年05月06日

  间:   201458日(星期四)下午4:10

  点:   中心教学楼610
报告一:博士生报告
时间:16:10-16:40

  目:手性分子探测的研究

报告人:吴桐              
 
指导老师: 张向东


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

probe of chiral molecules. 

报告二:博士生报告
时间:16:40-17:10

  目:    高采样速率近红外单光子探测

报告人:       朱阁                        
指导老师:赵清

摘要:
使
InGaAs/InP雪崩光电二极管工作在正弦门控模式下,实现了对1550 nm单光子的高速探测。为了减少后脉冲,我们采用带阻滤波器结合自差分的方法抑制门控信号产生的传输噪声,从而提取出非常小的雪崩信号。在门控信号频率为1 GHz时,单光子探测效率达到10%,同时暗计数概率率为10-5

联系方式:物理学院办公室(
68913163
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