Wavelength-Dependent Differential Interference Contrast Inversion of Anisotropic Gold Nanoparticles

Priscilla Choo, Alexander J. Hryn, Kayla S. Culver, Debanjan Bhowmik, Jingtian Hu, Teri W Odom

Research output: Contribution to journalArticle

2 Citations (Scopus)

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.

Original languageEnglish
JournalJournal of Physical Chemistry C
DOIs
Publication statusAccepted/In press - Jan 1 2018

Fingerprint

Nanorods
Gold
nanorods
inversions
gold
Nanoparticles
interference
Wavelength
nanoparticles
image contrast
wavelengths
Imaging techniques
Finite difference time domain method
finite difference time domain method
Microscopic examination
Electric fields
microscopy
electric fields
probes
sensors

ASJC Scopus subject areas

  • Electronic, Optical and Magnetic Materials
  • Energy(all)
  • Physical and Theoretical Chemistry
  • Surfaces, Coatings and Films

Cite this

Wavelength-Dependent Differential Interference Contrast Inversion of Anisotropic Gold Nanoparticles. / Choo, Priscilla; Hryn, Alexander J.; Culver, Kayla S.; Bhowmik, Debanjan; Hu, Jingtian; Odom, Teri W.

In: Journal of Physical Chemistry C, 01.01.2018.

Research output: Contribution to journalArticle

Choo, Priscilla ; Hryn, Alexander J. ; Culver, Kayla S. ; Bhowmik, Debanjan ; Hu, Jingtian ; Odom, Teri W. / Wavelength-Dependent Differential Interference Contrast Inversion of Anisotropic Gold Nanoparticles. In: Journal of Physical Chemistry C. 2018.
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