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Proceedings Paper

Second harmonic excitation spectroscopy in studies of Fano-type coupling in plasmonic arrays (Presentation Recording)
Author(s): Gary F. Walsh; Jacob T. Trevino; Emanuele Francesco Pecora; Luca Dal Negro
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Paper Abstract

Scattering by plasmon resonances of metallic nanoparticles can be tailored by particle material, size, shape, and local as well as long-range order. In this presentation we discuss a series of experiments in which long-range Fano-type coupling between grating resonances and localized surface palsmon (LSP) resonances were studied using second harmonic excitation (SH-E) spectroscopy. By tuning the excitation wavelength of a femtosecond laser and measuring the relative second harmonic (SH) signal we demonstrated that when long-range grating resonances spectrally overlap with those of the LSPs, electromagnetic field enhancement occurs on the surface of the nanoparticles leading to an increase in nonlinear scattering. This effect has been demonstrated for periodic arrays of monomers and dimers, bi-periodic antenna arrays for multi-spectral focusing to a single point, and chirped nanoparticle structures for broadband field enhancement. Results are supported by finite difference time domain simulations showing that electromagnetic fields are enhanced close on the surface of the nanoparticles when long-range structural resonances are excited. These studies have revealed design principles for engineering the interplay of photonic and plasmonic coupling for future linear and nonlinear plasmonic devices.

Paper Details

Date Published: 5 October 2015
PDF: 1 pages
Proc. SPIE 9547, Plasmonics: Metallic Nanostructures and Their Optical Properties XIII, 95470Y (5 October 2015); doi: 10.1117/12.2188079
Show Author Affiliations
Gary F. Walsh, U.S. Army Natick Soldier Research, Development and Engineering Ctr. (United States)
Boston Univ. (United States)
Jacob T. Trevino, The City Univ. of New York Advanced Science Research Ctr. (United States)
Boston Univ. (United States)
Emanuele Francesco Pecora, Stanford Univ. (United States)
Boston Univ. (United States)
Luca Dal Negro, Boston Univ. (United States)

Published in SPIE Proceedings Vol. 9547:
Plasmonics: Metallic Nanostructures and Their Optical Properties XIII
Allan D. Boardman; Din Ping Tsai, Editor(s)

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