Quantifying the local density of optical states of nanorods by fluorescence lifetime imaging

Jingjing Liu, Purdue University, Birck Nanotechnology Center, Bindley Bioscience Center
Xunpeng Jiang, Purdue University, Birck Nanotechnology Center, China Agricultural University
Satoshi Ishii, Purdue Univeristy, Birck Nanotechnology Center, National Institution of Information and Communication Technology Japan
V. M. Shalaev, Birck Nanotechnology Center and School of Electrical and Computer Engineering, Purdue University
Joseph Irudayaraj, Purdue University, Birck Nanotechnology Center, Bindley Bioscience Center

Date of this Version

6-30-2014

Comments

This is the Publisher PDF of Liu, J; Jiang, X; Ishiii, S; Shalaev, V; and Irudayaraj, J. "Quantifying the local density of optical states of nanorods by fluorescence lifetime imaging." New Journal of Physics, 16. 2014. Published by IOP Publishing, made available with a CC-BY license, available at http://dx.doi.org/10.1088/1367-2630/16/6/063069.

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 readouts. 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.

Discipline(s)

Nanoscience and Nanotechnology

 

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