Second-Harmonic Generation Optical Rotation Solely Attributable to Chirality in Plasmonic Metasurfaces

ACS Nano
Joel T CollinsVentsislav K Valev

Abstract

Chiral plasmonic nanostructures, those lacking mirror symmetry, can be designed to manipulate the polarization of incident light resulting in chiroptical (chiral optical) effects such as circular dichroism (CD) and optical rotation (OR). Due to high symmetry sensitivity, corresponding effects in second-harmonic generation (SHG-CD and SHG-OR) are typically much stronger in comparison. These nonlinear effects have long been used for chiral molecular analysis and characterization; however both linear and nonlinear optical rotation can occur even in achiral structures, if the structure is birefringent due to anisotropy. Crucially, chiroptical effects resulting from anisotropy typically exhibit a strong dependence on structural orientation. Here we report a large second-harmonic generation optical rotation of ±45°, due to intrinsic chirality in a highly anisotropic helical metamaterial. The SHG intensity is found to strongly relate to the structural anisotropy; however, the angle of SHG-OR is invariant under sample rotation. We show that by tuning the geometry of anisotropic nanostructures, the interaction between anisotropy, chirality, and experimental geometry can allow even greater control over the chiroptical properties of plasm...Continue Reading

References

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Feb 1, 2017·Advanced Materials·David C HooperVentsislav K Valev

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Citations

May 18, 2019·Light, Science & Applications·Yang ChenJie Gao
Oct 24, 2020·The Journal of Chemical Physics·Nicole R FamularoDouglas H Werner
Feb 18, 2021·Advanced Materials·Junjun LiuZhifeng Huang
Jul 11, 2021·The Review of Scientific Instruments·S H KimY Ishida
Jan 21, 2022·Nanoscale·Anamaria TrandafirAdelina Ilie
Aug 10, 2019··E. A. MamonovT. V. Murzina
Oct 1, 2019··T. V. MurzinaE. A. Mamonov

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