Freiburg 2024 – wissenschaftliches Programm

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Q: Fachverband Quantenoptik und Photonik

Q 57: Poster VIII

Q 57.8: Poster

Donnerstag, 14. März 2024, 17:00–19:00, Aula Foyer

Defect Dynamics and Microstructure in Colloidal Glasses Using Holographic Optical Tweezers — •Rhuthwik Sriranga^1,2, Ratimanasee Sahu¹, Diptabrata Paul¹, GV Pavan Kumar¹, Vijayakumar Chikkadi¹, and Patrick Windpassinger² — ¹Indian Institute of Science Education and Research Pune, India — ²Institute of Physics, Johannes Gutenberg-Universität Mainz

This study delves into the intricate relationship between plastic activity and microstructure in amorphous materials using optical tweezer techniques. Shear fields in a colloidal monolayer are generated using holographic optical tweezers with a Laguerre-Gaussian beam and a spatial light modulator. With this setup, we examine the relationships between defect dynamics and microstructure in a quasi-2D system of colloidal glasses, including the orientation of defects with respect to the shear direction. Using time-shared optical tweezers to trap more than 250 particles, we investigate the effect of random pinning on the phonon modes in colloidal crystals and glasses. Through these optical techniques, we aim to bridge the gap in understanding the behaviour of disordered solids and their response to external stimuli, providing valuable insights into the fundamental mechanics of amorphous substances.

Keywords: Holographic Optical Tweezers; Topological Vortex beams; Amorphous solids; Optical Traps; Microscopy