2020/12/09 by Abuduwaili Abudukelimu, Abudukelimu, Abuduwaili., Tursunay Yibibulla +5
Biochemistry, Genetics and Molecular Biology · Chemistry · Engineering · #78-10 #DNA and Nucleic Acid Chemistry #F.2.1 #FOS: Physical sciences #Molecular spectroscopy and chirality #Optics (physics.optics) #Plasmonic and Surface Plasmon Research
paper · pdf · doi:10.48550/arxiv.2012.04931
openalex publication_date 2020/12/09 · openalex created_date 2025/10/10 · openalex updated_date 2026/07/28
Circular dichroism (CD) is absorption difference of right-hand and left-hand circularly polarized light by components. CD spectroscopy technique is an important tool for detecting molecular chirality, but the molecular circular dichroism (MCD) is weak and always appears in the ultraviolet (UV) region that is more noisy than visual range (VR). Induced circular dichroism (ICD) arisen from near-field interaction of plasmonic nanostructures and chiral molecules enhances the detection limit of molecular chirality and usually appears in VR. In this study, quadrilateral arranged nanoholes (QAN) are proposed for enhancing the MCD. The maximum enhancement achieved by the structure is about 200 folds of the MCD. Furthermore, we explained the mechanism of ICD which is generated by symmetry breaking of electric field QAN by molecular dipole. We investigated the effect of surface plasmon resonance (SPR) mode on ICD through analyzing the electric dipole (ED) and magnetic dipole (MD) resonance modes. ICD was found to get enhanced as a result of overlapping of ED and MD resonance around QAN. Besides this investigation, we probed the effects of thickness of structure, length of holes and length of periods on the MCD enhancement