title: Two-photon imaging of a magneto-fluorescent indicator for 3D optical magnetometry.
abstract: We developed an optical method to visualize the three-dimensional distribution of magnetic field strength around magnetic microstructures. We show that the two-photon-excited fluorescence of a chained donor-bridge-acceptor compound, phenanthrene-(CH2)12-O-(CH2)2-N,N-dimethylaniline, is sensitive to ambient magnetic field strength. A test structure is immersed in a solution of the magneto-fluorescent indicator and a custom two-photon microscope maps the fluorescence of this compound. The decay kinetics of the electronic excited state provide a measure of magnetic field that is insensitive to photobleaching, indicator concentration, or local variations in optical excitation or collection efficiency.
authors.forename: Hohjai
authors.initials: H
authors.lastname: Lee
authors.forename: Daan
authors.initials: D
authors.lastname: Brinks
authors.forename: Adam E
authors.initials: AE
authors.lastname: Cohen