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Toward High‐Speed Nanoscopic Particle Tracking via Time‐Resolved Detection of Directional Scattering
Author(s) -
Beck Paul,
Neugebauer Martin,
Banzer Peter
Publication year - 2020
Publication title -
laser and photonics reviews
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 3.778
H-Index - 116
eISSN - 1863-8899
pISSN - 1863-8880
DOI - 10.1002/lpor.202000110
Subject(s) - optics , photodetector , ultrashort pulse , detector , bandwidth (computing) , wavelength , tracking (education) , temporal resolution , physics , image resolution , scattering , light beam , materials science , computer science , laser , telecommunications , psychology , pedagogy
Owing to their immediate relevance for high precision position sensors, a variety of different sub‐wavelength localization techniques has been developed in the past decades. However, many of these techniques suffer from low temporal resolution or require expensive detectors. Here, a method is presented that is based on the ultrafast detection of directionally scattered light with a quadrant photodetector operating at a large bandwidth, which exceeds the speed of most cameras. The directionality emerges due to the position dependent tailored excitation of a high‐refractive index nanoparticle with a tightly focused vector beam. A spatial resolution of 1.1 nm and a temporal resolution of 8 kHz is reached experimentally, which is not a fundamental but rather a technical limit. The detection scheme enables real‐time particle tracking and sample stabilization in many optical setups sensitive to drifts and vibrations.