Bonn 2025 – scientific programme
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K: Fachverband Kurzzeit- und angewandte Laserphysik
K 6: Poster
K 6.3: Poster
Tuesday, March 11, 2025, 14:00–16:00, Tent
Ping-Pong with microparticles — •Krishna Kant Singh1,2, Ajitesh Singh2, Deepak Kumar2, and Debabrata Goswami2,3 — 1Department of Physics, University of Kassel, Germany — 2Department of Chemistry, Indian Institute of Technology Kanpur, India — 3Centre for Lasers and Photonics, Indian Institute of Technology Kanpur, India
Optical tweezers [1] have become a versatile and potent instrument in the realms of experimental physics, biology, and nanotechnology, allowing for the manipulation of particles ranging from micrometres to nanometres. While the use of high-repetition-rate ultrafast lasers has garnered significant attention, particularly in nanoparticle manipulation, low-repetition-rate lasers have not received comparable recognition due to challenges in achieving stable trapping. Seeking further insights, we employed an amplified kHz laser source in an optical tweezers setup for the first time, yielding intriguing findings. Our results demonstrated distinct particle behaviours compared to conventional optical tweezers, showcasing a ping-pong motion within an optically confined zone. Moreover, we achieved the successful dragging and trapping of particles from considerable distances by synergizing an amplified kHz beam with a MHz beam, a phenomenon not observed in traditional optical tweezers setups.
References [1]A. Ashkin, J. M. Dziedzic, J. E. Bjorkholm, and S. Chu, "Observation of a single-beam gradient force optical trap for dielectric particles," Opt. lett., vol. 11, no. 5, pp. 288-290, 1986.
Keywords: Optical Tweezers; kHz amplified laser tweezers; Ping-pong motion; Manipulation of particles