Tailored Fano resonance and localized electromagnetic field enhancement in Ag gratings

Li, Zhaozhu; Klopf, J. Michael; Wang, Lei; Yang, Kaida; Lukaszew, Rosa A.

doi:10.1038/srep44335

Title: Tailored Fano resonance and localized electromagnetic field enhancement in Ag gratings

Journal Article · Tue Mar 14 00:00:00 EDT 2017 · Scientific Reports

DOI:https://doi.org/10.1038/srep44335· OSTI ID:1423780

Li, Zhaozhu ^[1]; Klopf, J. Michael ^[2]; Wang, Lei ^[3]; Yang, Kaida ^[1]; Lukaszew, Rosa A. ^[1]

The College of William and Mary, Williamsburg, VA (United States). Department of Physics
The College of William and Mary, Williamsburg, VA (United States). Department of Physics; Helmholtz Zentrum Dresden-Rossendorf, Institute for Radiation Physics, Dresden (Germany)
The College of William and Mary, Williamsburg, VA (United States). Department of Physics; Univ. of Virginia, Charlottesville, VA (United States). Dept. of Mechanical & Aerospace Engineering

Metallic gratings can support Fano resonances when illuminated with EM radiation, and their characteristic reflectivity versus incident angle lineshape can be greatly affected by the surrounding dielectric environment and the grating geometry. By using conformal oblique incidence thin film deposition onto an optical grating substrate, it is possible to increase the grating amplitude due to shadowing effects, thereby enabling tailoring of the damping processes and electromagnetic field couplings of the Fano resonances, hence optimizing the associated localized electric field intensity. To investigate these effects we compare the optical reflectivity under resonance excitation in samples prepared by oblique angle deposition (OAD) and under normal deposition (ND) onto the same patterned surfaces. We observe that by applying OAD method, the sample exhibits a deeper and narrower reflectivity dip at resonance than that obtained under ND. This can be explained in terms of a lower damping of Fano resonance on obliquely deposited sample and leads to a stronger localized electric field. This approach opens a fabrication path for applications where tailoring the electromagnetic field induced by Fano resonance can improve the figure of merit of specific device characteristics, e.g. quantum efficiency (QE) in grating-based metallic photocathodes.

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Research Organization:: The College of William and Mary, Williamsburg, VA (United States)

Sponsoring Organization:: USDOE Office of Science (SC), High Energy Physics (HEP)

Grant/Contract Number:: SC0008546

OSTI ID:: 1423780

Journal Information:: Scientific Reports, Vol. 7; ISSN 2045-2322

Publisher:: Nature Publishing GroupCopyright Statement

Country of Publication:: United States

Language:: English

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Cited by: 3 works

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