Abstract
In this paper, we demonstrate a facile far-field approach to quantify the near-field local density of optical states (LDOS) of a nanorod using CdTe quantum dot (QD) emitters tethered to the surface of the nanorods as beacons for optical read-outs. The radiative decay rate was extracted to quantify the LDOS; our analysis indicates that the LDOS of the nanorod enhances both the radiative and nonradiative decay of QDs, particularly the radiative decay of QDs at the end of a nanorod is enhanced by 1.17 times greater than that at the waist, while the nonradiative decay was enhanced uniformly over the nanorod. To the best of our knowledge, our effort constitutes the first to map the LDOS of a nanostructure via the far-field method, to provide clarity on the interaction mechanism between emitters and the nanostructure, and to be potentially employed in the LDOS mapping of high-throughput nanostructures.
Highlights
AuNR is deduced by recording and analyzing the spontaneous decay of the quantum dot (QD), and the radical local density of optical states (LDOS) of the AuNRs can be detected by controlling the distance between the quantum dots (QDs) and the AuNRs with a thin layer of silica
AuNR is deduced by recording and analyzing the spontaneous decay of the QDs, and the radical LDOS of the AuNRs can be detected by controlling the distance between the QDs and the AuNRs with a thin layer of silica
Spontaneous emissions of QDs are recorded by confocal fluorescence lifetime imaging microscopy (FLIM), which does not involve nanopositioning control and has the ability to record the signal in the far-field
Summary
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