All-Optical Quantum Sensing of Rotational Brownian Motion of Magnetic Molecules
Name
Li19b.pdf
Description
Accepted version
Size
6.87 MB
Format
Adobe PDF
Checksum (MD5)
a4dcffb566aa4848aed0c3e932678469
Author(s)
Li, Changhao
Chen, Mo
Lyzwa, Dominika
Cappellaro, Paola
Date Issued
September 24, 2019
Journal
Nano letters
Publisher
American Chemical Society (ACS)
Citation
Li, Changhao, Mo Chen, Dominika Lyzwa, and Paola Cappellaro. "All-Optical Quantum Sensing of Rotational Brownian Motion of Magnetic Molecules." Nano Letters Volume 19 (2019): 7342-7348 © 2019 The Author(s)
Version
Author's final manuscript
Abstract
Sensing the local environment through the motional response of small molecules lays the foundation of many fundamental technologies. The information on local viscosity, for example, is contained in the random rotational Brownian motions of molecules. However, detection of the motions is challenging for molecules with sub-nanometer scale or high motional rates. Here we propose and experimentally demonstrate a novel method of detecting fast rotational Brownian motions of small magnetic molecules. With electronic spins as sensors, we are able to detect changes in motional rates, which yield different noise spectra and therefore different relaxation signals of the sensors. As a proof-of-principle demonstration, we experimentally implemented this method to detect the motions of gadolinium (Gd) complex molecules with nitrogen-vacancy (NV) centers in nanodiamonds. With all-optical measurements of the NV centers' longitudinal relaxation, we distinguished binary solutions with varying viscosities. Our method paves a new way for detecting fast motions of sub-nanometer sized magnetic molecules with better spatial resolution than conventional optical methods. It also provides a new tool in designing better contrast agents in magnetic resonance imaging.
Subjects
Mechanical Engineering
General Materials Science
Bioengineering
General Chemistry
Condensed Matter Physics
MIT Department
Massachusetts Institute of Technology. Department of Nuclear Science and Engineering
Massachusetts Institute of Technology. Department of Mechanical Engineering
Terms of Use
Article is made available in accordance with the publisher's policy and may be subject to US copyright law. Please refer to the publisher's site for terms of use.
Persistent DSpace Link
DOI of Published Version
https://doi.org/10.1021/acs.nanolett.9b02960
