Open AccessHighly stable measurement for nanoparticle extinction cross section by analyzing aperture-edge blurriness
Author(s) -
Qianwen Ying,
Jiahao Zhang,
Hongliang Zhang,
Max Yan,
Zhichao Ruan
Publication year - 2021
Publication title -
optics express
Language(s) - Uncategorized
Resource type - Journals
SCImago Journal Rank - 1.394
H-Index - 271
ISSN - 1094-4087
DOI - 10.1364/oe.426163
Subject(s) - optics , extinction ratio , modulation (music) , materials science , extinction (optical mineralogy) , chopper , sensitivity (control systems) , enhanced data rates for gsm evolution , physics , computer science , acoustics , electronic engineering , telecommunications , wavelength , quantum mechanics , voltage , engineering
In order to stabilize the extinction cross section measurement of a single nanoparticle, we propose to analyze the blurriness parameter of aperture edge images in real time, which provides a feedback to lock the sample position. Unlike the conventional spatial modulation spectroscopy (SMS) technique, a probe beam experiences both the spatial modulation by a piezo stage and the temporal modulation by a chopper. We experimentally demonstrate that the measurement uncertainty is one order magnitude less than that in the previous report. The proposed method can be readily implemented in conventional SMS systems and can help to achieve high stability for sensing based on light extinction by a single nanoparticle, which alleviate the impact from laboratory environment and increase the experimental sensitivity.