Berlin 2024 – scientific programme

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O: Fachverband Oberflächenphysik

O 66: Poster: Nanostructures at Surfaces

O 66.2: Poster

Wednesday, March 20, 2024, 18:00–20:00, Poster C

Enhancing Chiroptical Sensitivity: Exploring Chirality with Second Harmonic Generation-Circular Dichroism Spectroscopy — •Charitini Panagiotopoulou, Kevin Liang, Changseop Jeong, Ueli Heiz, and Aras Kartouzian — Chair of Physical Chemistry, School of Natural Sciences & Catalysis Research Center, Technische Universität München, Lichtenbergstr. 4, 85748 Garching, Germany

Chirality holds significance in a variety of molecules, playing a fundamental role in chemical, biological, and material processes. Circular Dichroism (CD) spectroscopy, utilizing circularly polarized light, discloses the differential in absorption between right and left circularly polarized light. Chiral molecules, featuring non-superimposable mirror images, necessitate CD for rapid, non-destructive analysis of their structural and electronic properties. Our study introduces a method to enhance CD sensitivity; Second Harmonic Generation (SHG) spectroscopy, known as SHG-CD spectroscopy. This approach uses the nonlinear response of SHG, which is particularly effective in non-centrosymmetric environments like thin film surfaces. Under UHV conditions, we investigate the structural aspects of chiral molecules on thin films and the chirality transfer to achiral counterparts, making a wide range of applications possible, from fundamental studies of surface properties to practical applications in fields such as materials science, biophysics, and catalysis.

Keywords: chirality; thin film; surface spectroscopy; circular dichroism; second harmonic generation