@article{0010b6de7b6d477b942cee686ec7fd78,
title = "Wavelength-Dependent Differential Interference Contrast Inversion of Anisotropic Gold Nanoparticles",
abstract = "Gold nanorods are promising nanoparticle-orientation sensors because they exhibit wavelength and angle-dependent optical patterns in their differential interference contrast (DIC) microscopy images. In this paper, we report a finite-difference time-domain method to simulate DIC images using nanorods as model probes. First, we created a DIC image library of nanorods as a function of imaging wavelength and rotation angle that showed good agreement with experimental results. Second, we used this simulation tool to explain why the patterns inverted from bright to dark when the imaging wavelength increased from below to above the plasmon resonance of the nanorod. We found that this intensity inversion resulted from reversal in the electric field direction depending on wavelength relative to the nanorod plasmon resonance. Finally, we showed that this DIC contrast inversion is a general phenomenon by measuring and simulating DIC images from gold nanorods of different sizes and gold nanostars.",
author = "Priscilla Choo and Hryn, {Alexander J.} and Culver, {Kayla S.} and Debanjan Bhowmik and Jingtian Hu and Odom, {Teri W.}",
note = "Funding Information: This work was supported by the National Science Foundation (NSF) under NSF Award CHE-1507790 and NIH grant 1R01GM115763. We acknowledge government support under FA9550-11-C-0028 awarded by DoD, Air Force Office of Scientific Research, National Defense Science and Engineering Graduate (NDSEG) Fellowship, 32 CFR 168a. (A.J.H., K.S.C.), NIH grant 1R01GM115763 (P.C.). This work made use of the EPIC facility of the NUANCE Center at Northwestern University, which has received support from the Soft and Hybrid Nanotechnology Experimental (SHyNE) Resource (NSF NNCI-1542205); the MRSEC program (NSF DMR-1121262) at the Materials Research Center; the International Institute for Nanotechnology (IIN); the Keck Foundation; and the State of Illinois, through the IIN. This research was also supported in part through the computational resources and staff contributions provided for the Quest high-performance computing facility at Northwestern University, which is jointly supported by the Office of the Provost, the Office for Research, and Northwestern University Information Technology. Publisher Copyright: {\textcopyright} 2018 American Chemical Society.",
year = "2018",
month = nov,
day = "29",
doi = "10.1021/acs.jpcc.8b08995",
language = "English (US)",
volume = "122",
pages = "27024--27031",
journal = "Journal of Physical Chemistry C",
issn = "1932-7447",
publisher = "American Chemical Society",
number = "47",
}