Circular Dichroism Enhancement: Symmetric Meta‐Absorber‐Induced Superchirality (Advanced Optical Materials 21/2019)

Abstract

Strongly localized chiral optical fields can enhance the chiral light–matter interaction. In article number 1901038, Qiaoqiang Gan, Qiwen Zhan and co‐workers present a design for the generation of superchiral optical field using symmetric metamaterial superabsorber structures and demonstrate its application in enhanced circular dichroism (CD) spectroscopy. Simulations reveal that the optical chirality density and the CD signal can be enhanced by 80‐ and 1300‐fold, respectively, revealing a strategy to develop scalable platforms for chiroptical applications.

Induced circular dichroism of achiral dielectric elliptical hole arrays with a monolayer borophene film

“…ICD effects are attributed to the electromagnetic coupling between chiral molecules and artificial plasmon nanostructures. [15][16][17][18][19] ICD can be achieved by immersing achiral nanostructure gaps with hot spots 20 or chiral nanostructures with super chiral fields 21 into a solution of chiral molecules. The silver nanoparticles in the aqueous solution of chiral molecules can realize ICD effects in the visible light band.…”

Surface Enhanced Circular Dichroism by Quadrilateral Arranged Nanoholes

“…In past decades, many experimental and theoretical efforts have been carried out to enhance detection limit of molecular chirality by surface enhanced technique [14][15][16][18][19][20]. On one hand, the enhanced local optical chiral field from nanostructure is considered for enhancing the molecular inherent MCD which is useful in chirality detection [11,18,21] and enantioselective septation of enantiomers [5,6], while on the other hand, ICD by chiral molecules in achiral nanostructure extensively enhances the MCD signal [14,15,[22][23][24][25][26][27][28]. Different shapes such as spheres, crosses, cubes and cylinders [14,15,[22][23][24][25][26][27], and materials such as gold, silver and dielectric [25][26][27][28] have been put forward for enhancing the MCD.…”