Detection of pitch rotation to high resolution in an optically trapped hexagonal shaped upconverting particle

Snigdhadev Chakraborty; Gokul Nalupurackal; Basudev Roy

doi:10.1117/12.3024704

2 October 2024 Detection of pitch rotation to high resolution in an optically trapped hexagonal shaped upconverting particle

Snigdhadev Chakraborty, Gokul Nalupurackal, Basudev Roy

Author Affiliations +

Proceedings Volume 13112, Optical Trapping and Optical Micromanipulation XXI; 1311207 (2024) https://doi.org/10.1117/12.3024704
Event: Nanoscience + Engineering, 2024, San Diego, California, United States

Abstract

A rigid body can have six degrees of freedom, of which three are with rotational origin. In the nomenclature of the airlines, the in-plane degree of rotational freedom can be called yaw, while the first out-of-plane degree of freedom can be called pitch, with the second one called roll. Among these, only the yaw sense has been studied extensively in the optical tweezers literature, while the pitch rotation is starting to be explored. In this paper, we show a way to detect the pitch rotation in a hexagonal-shaped particle using photonic force microscopy using the forward scattered light under crossed polarizers and making it incident on a split photodiode. In this way, the pitch angle can be detected at high resolution and bandwidth. We apply this technique to detect continuous pitch rotation and also exhibit a power spectral density for an anisotropic particle optically trapped in a linearly polarized light and exhibiting Brownian motion.

(2024) Published by SPIE. Downloading of the abstract is permitted for personal use only.

Citation Download Citation

Snigdhadev Chakraborty, Gokul Nalupurackal, and Basudev Roy "Detection of pitch rotation to high resolution in an optically trapped hexagonal shaped upconverting particle", Proc. SPIE 13112, Optical Trapping and Optical Micromanipulation XXI, 1311207 (2 October 2024); https://doi.org/10.1117/12.3024704

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