Optimizing the precision of the acquired optical tweezers stiffness with the FPGA-based PID algorithm

Shuo Liu; Xudong Fan; Zhelin Qu; Changfeng Fang; Xian Zhao; Jun-Lei Wang

doi:10.1117/12.2666251

4 April 2023 Optimizing the precision of the acquired optical tweezers stiffness with the FPGA-based PID algorithm

Shuo Liu, Xudong Fan, Zhelin Qu, Changfeng Fang, Xian Zhao, Jun-Lei Wang

Proceedings Volume 12617, Ninth Symposium on Novel Photoelectronic Detection Technology and Applications; 1261745 (2023) https://doi.org/10.1117/12.2666251
Event: 9th Symposium on Novel Photoelectronic Detection Technology and Applications (NDTA 2022), 2022, Hefei, China

Abstract

The stiffness of an optical tweezer is one of the most crucial parameters in virtually all related quantization experiments. Due to the limitation of instruments and the uncertainty of the measurement, the acquisition of the stiffness often takes place in a prolonged period and or requires additional data processing. Here, we demonstrate that with a PID power locking system made from a feedback loop consisting of a Field-Programmable Gate Array (FPGA) and Acoustic Optical Modulator (AOM), the stiffness calculated from the Quadrant Photodetector (QPD) signal shows a significantly reduced uncertainty compared to that of the unlocked situation, resulting in a much-reduced measurement time and an improved accuracy.

Citation Download Citation

Shuo Liu, Xudong Fan, Zhelin Qu, Changfeng Fang, Xian Zhao, and Jun-Lei Wang "Optimizing the precision of the acquired optical tweezers stiffness with the FPGA-based PID algorithm", Proc. SPIE 12617, Ninth Symposium on Novel Photoelectronic Detection Technology and Applications, 1261745 (4 April 2023); https://doi.org/10.1117/12.2666251

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