Dr. Jed I. Ziegler Profile

Dr. Jed I. Ziegler

Ph.D Student at Vanderbilt Univ

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Proceedings Article | 3 September 2009 Paper

Interface effects in hybrid gold/vanadium dioxide nanostructures

Jed Ziegler, Joyeeta Nag, Richard Haglund

Proceedings Volume 7394, 73940Q (2009) https://doi.org/10.1117/12.826578

KEYWORDS: Gold, Plasmonics, Particles, Annealing, Crystals, Surface enhanced Raman spectroscopy, Interfaces, Raman spectroscopy, Semiconductors, Dielectrics

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Gold/vanadium dioxide nanoparticles (NPs) were produced with the intention of creating a hybrid NP retaining the characteristic semiconductor-metal phase transition of VO₂ and the plasmonic properties of gold. The fabrication procedure for arrays of the hybrid structure is presented with optical characterization and analysis of the plasmonic structure. The high-temperature anneal required to insure the stoichiometry of the VO₂ leads to dewetting of the Au from the underlying VO₂ layer, and to dramatic reshaping of the gold NP. Surface enhanced Raman spectroscopy verifies the retention of the VO2 crystalline structure and phase transition; white light extinction measurements exhibit the polarization sensitive plasmonic resonance peaks that characterize the electronic signature of the phase transition. Together these techniques show that the composite system experiences no significant intermingling between the two materials during processing. Furthermore, the controllable nature of the extent of dewetting, via aspect ratio of the pre-annealed particle, suggests that the hybrid system will give insight into interface interactions between the optical and structural properties of the constituents. A second method is suggested to circumvent the annealing effect. The conclusions of our investigation suggest applications as both a thermally or optically tunable plasmonic structure.

Proceedings Article | 3 September 2009 Paper

Far-field coupling in arrays of gold and gold::vanadium dioxide nanodimers

D. Ferrara, J. Nag, E. MacQuarrie, K. Appavoo, R. Haglund

Proceedings Volume 7394, 73942Q (2009) https://doi.org/10.1117/12.826577

KEYWORDS: Neodymium, Particles, Dielectrics, Dielectric polarization, Gold, Metals, Finite-difference time-domain method, Nanostructures, Polarization, Nanoparticles

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Previous observations on arrays of single nanoparticles (NPs) have shown that particle separation and grating constant determine the peak extinction wavelength of the local surface plasmon resonance (LSPR). Recently, it has been predicted that the LSPR peak extinction wavelength in arrays of nanodimers (NDs) exhibit enhanced sensitivity to changes in the local dielectric function compared to single NPs. In order to test this prediction, arrays of NPs, NDs and heterodimers comprising three different NP sizes were fabricated by electron-beam lithography with various grating constants, particle diameters, and interparticle separations. Another set of arrays were also fabricated and coated with approximately 60-nm of vanadium dioxide, which undergoes an insulator to metal phase transition at a critical temperature near 68.C. By tuning the temperature of the samples through the strong-correlation region around the critical temperature, we varied the effective dielectric constant surrounding the NP arrays over a significant range. Linear extinction measurements on the arrays were made at temperatures above and below the critical temperature, with linear polarizers placed in the incident beam in order to distinguish between LSPR modes. Measurements show a clear dependence of LSPR sensitivity to interparticle separation as well as the dielectric function of the surrounding medium. Finally, finite-difference time-domain (FDTD) simulations were carried out for comparison with the experimental results.

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