skip to main content
OSTI.GOV title logo U.S. Department of Energy
Office of Scientific and Technical Information

Title: ZnO/Ag composite nanorod arrays for surface-plasmon-enhanced emission study

Abstract

The surface plasmon resonance enhanced emission through coupling of surface plasmons and exciton band energies is studied in hybrid ZnO/Ag nanostructure. The catalytic growth of ZnO nanorods is controlled in seed mediated growth by altering size distribution of Ag nanoislands. X-ray diffraction shows a predominant (002) crystal plane confirming the preferential growth of ZnO nanorods on as-deposited Ag. Increase of surface roughness in Ag film by post deposition annealing process enhances the light emission due to momentum matching between surface plasmons and excitons as well as a red shift of 32 meV occurs due to multi phonon and phonon-exciton interaction.

Authors:
;  [1]
  1. Department of Physics, School of Physical, Chemical and Applies Sciences, Pondicherry University, Pondicherry-605014 (India)
Publication Date:
OSTI Identifier:
22271079
Resource Type:
Journal Article
Resource Relation:
Journal Name: AIP Conference Proceedings; Journal Volume: 1591; Journal Issue: 1; Conference: 58. DAE solid state physics symposium 2013, Patiala, Punjab (India), 17-21 Dec 2013; Other Information: (c) 2014 AIP Publishing LLC; Country of input: International Atomic Energy Agency (IAEA)
Country of Publication:
United States
Language:
English
Subject:
75 CONDENSED MATTER PHYSICS, SUPERCONDUCTIVITY AND SUPERFLUIDITY; 77 NANOSCIENCE AND NANOTECHNOLOGY; ANNEALING; COMPOSITE MATERIALS; COUPLING; CRYSTALS; DEPOSITION; EXCITONS; HETEROJUNCTIONS; NANOSTRUCTURES; PHONONS; PHOTON EMISSION; PLASMONS; RED SHIFT; ROUGHNESS; SILVER; SURFACES; THIN FILMS; X-RAY DIFFRACTION; ZINC OXIDES

Citation Formats

Pal, Anil Kumar, E-mail: d.bharathimohan@gmail.com, E-mail: d.bharathimohan@gmail.com, and Mohan, D. Bharathi, E-mail: d.bharathimohan@gmail.com, E-mail: d.bharathimohan@gmail.com. ZnO/Ag composite nanorod arrays for surface-plasmon-enhanced emission study. United States: N. p., 2014. Web. doi:10.1063/1.4872826.
Pal, Anil Kumar, E-mail: d.bharathimohan@gmail.com, E-mail: d.bharathimohan@gmail.com, & Mohan, D. Bharathi, E-mail: d.bharathimohan@gmail.com, E-mail: d.bharathimohan@gmail.com. ZnO/Ag composite nanorod arrays for surface-plasmon-enhanced emission study. United States. doi:10.1063/1.4872826.
Pal, Anil Kumar, E-mail: d.bharathimohan@gmail.com, E-mail: d.bharathimohan@gmail.com, and Mohan, D. Bharathi, E-mail: d.bharathimohan@gmail.com, E-mail: d.bharathimohan@gmail.com. 2014. "ZnO/Ag composite nanorod arrays for surface-plasmon-enhanced emission study". United States. doi:10.1063/1.4872826.
@article{osti_22271079,
title = {ZnO/Ag composite nanorod arrays for surface-plasmon-enhanced emission study},
author = {Pal, Anil Kumar, E-mail: d.bharathimohan@gmail.com, E-mail: d.bharathimohan@gmail.com and Mohan, D. Bharathi, E-mail: d.bharathimohan@gmail.com, E-mail: d.bharathimohan@gmail.com},
abstractNote = {The surface plasmon resonance enhanced emission through coupling of surface plasmons and exciton band energies is studied in hybrid ZnO/Ag nanostructure. The catalytic growth of ZnO nanorods is controlled in seed mediated growth by altering size distribution of Ag nanoislands. X-ray diffraction shows a predominant (002) crystal plane confirming the preferential growth of ZnO nanorods on as-deposited Ag. Increase of surface roughness in Ag film by post deposition annealing process enhances the light emission due to momentum matching between surface plasmons and excitons as well as a red shift of 32 meV occurs due to multi phonon and phonon-exciton interaction.},
doi = {10.1063/1.4872826},
journal = {AIP Conference Proceedings},
number = 1,
volume = 1591,
place = {United States},
year = 2014,
month = 4
}
  • Here, we demonstrate that quasi self-standing Au nanorod arrays prepared with plasma polymerisation deposited SiO{sub 2} dielectric spacers support surface enhanced fluorescence (SEF) while maintaining high signal reproducibility. We show that it is possible to find a balance between enhanced radiative and non-radiative decay rates at which the fluorescent intensity is maximized. The SEF signal optimised with a 30 nm spacer layer thickness showed a 3.5-fold enhancement with a signal variance of <15% thereby keeping the integrity of the nanorod array. We also demonstrate the decreased importance of obtaining resonance conditions when localized surface plasmon resonance is positioned within the spectralmore » region of Au interband transitions. Procedures for further increasing the SEF enhancement factor are also discussed.« less
  • We report a 43-fold enhancement in the hard x-ray emission (in the 150-300 keV range) from copper nanorod arrays (compared to a polished Cu surface) when excited by 30-fs, 800-nm laser pulses with an intensity of 10{sup 16} W/cm{sup 2}. The temperature of the hot electrons that emit the x rays is 11 times higher. Significantly, the x-ray yield enhancement is found to depend on both the aspect ratio as well as the cluster size of the nanorods. We show that the higher yield arises from enhanced laser absorption owing to the extremely high local electric fields around the nanorodmore » tips. Particle-in-cell plasma simulations reproduce these observations and provide pointers to further optimization of the x-ray emission.« less
  • Large-scale Ag nanodisks (NDs) arrays fabricated using nanospherical-lens lithography (NLL) are embedded in p-GaN layer of an InGaN/GaN light-emitting diode (LED) for generating localized surface plasmon (LSP) coupling with the radiating dipoles in the quantum-well (QWs). Based on the Ag NDs with the controlled surface coverage, LSP leads to the improved crystalline quality of regrowth p-GaN, increased photoluminescence (PL) intensity, reduced PL decay time, and enhanced output power of LED. Compared with the LED without Ag NDs, the optical output power at a current of 350 mA of the LSP-enhanced LEDs with Ag NDs having a distance of 20 andmore » 35 nm to QWs is increased by 26.7% and 31.1%, respectively. The electrical characteristics and optical properties of LEDs with embedded Ag NPs are dependent on the distance of between Ag NPs and QWs region. The LED with Ag NDs array structure is also found to exhibit reduced emission divergence, compared to that without Ag NDs.« less
  • Tunable surface plasmon resonance (SPR) and dipole cavity plasmon modes of the scattering cross section (SCS) spectra on the single solid-gold/gold-shell nanorod have been numerically investigated by using the finite element method. Various effects, such as the influence of SCS spectra under x- and y-polarizations on the surface of the single solid-gold/gold-shell nanorod, are discussed in detail. With the single gold-shell nanorod, one can independently tune the relative SCS spectrum width by controlling the rod length and rod diameter, and the surface scattering by varying the shell thickness and polarization direction, as well as the dipole peak energy. These behaviorsmore » are consistent with the properties of localized SPRs and offer a way to optically control and produce selected emission wavelengths from the single solid-gold/gold-shell nanorod. The electric field and magnetic distributions provide us a qualitative idea of the geometrical properties of the single solid-gold/gold-shell nanorod on plasmon resonance.« less