Exploiting dynamic nonlinearity in upconversion nanoparticles for super-resolution imaging
Abstract
Single-beam super-resolution microscopy, also known as superlinear microscopy, exploits the nonlinear response of fluorescent probes in confocal microscopy. The technique requires no complex purpose-built system, light field modulation, or beam shaping. Here, we present a strategy to enhance spatial resolution of superlinear microscopy by modulating excitation intensity during image acquisition. This modulation induces dynamic optical nonlinearity in upconversion nanoparticles (UCNPs), resulting in variations of higher spatial-frequency information in the obtained images. The high-order information can be extracted with a proposed weighted finite difference imaging algorithm from raw fluorescence images, to generate an image with a higher resolution than superlinear microscopy images. We apply this approach to resolve two adjacent nanoparticles within a diffraction-limited area, improving the resolution to 130 nm. This work suggests a new scope for developing dynamic nonlinear fluorescent probes in super-resolution nanoscopy.
Cite
@article{arxiv.2206.01375,
title = {Exploiting dynamic nonlinearity in upconversion nanoparticles for super-resolution imaging},
author = {Chaohao Chen and Lei Ding and Baolei Liu and Ziqin Du and Yongtao Liu and Xiangjun Di and Xuchen Shan and Chenxiao Lin and Min Zhang and Xiaoxue Xu and Xiaolan Zhong and Jianfeng Wang and Lingqian Chang and Ben J. Halkon and Xin Chen and Faliang Cheng and Fan Wang},
journal= {arXiv preprint arXiv:2206.01375},
year = {2022}
}
Comments
26 pages with 4 figures