Title: Switchable and non-switchable zero backscattering of dielectric nano-resonators

Abstract

Previous studies have shown that two-dimensional (2D) arrays of high-permittivity dielectric nanoparticles are capable of fully suppressing backward light scattering when the resonant frequencies of electrical and magnetic dipolar modes are coincident. In this paper, we numerically demonstrate that the zero-backscattering of 2D Si nanocuboid arrays can be engineered to be switchable or non-switchable in response to a variation in the environmental refractive index. For each cuboid width/length, there exist certain cuboid heights and orthogonal periodicity ratio for which the electrical and magnetic resonances exhibit similar spectra widths and equivalent sensitivities to the environmental index changes, so that the zero-backscattering is non-switchable upon environmental change. For some other cuboid heights and certain anisotropic periodicity ratios, the electric and magnetic modes exhibit different sensitivities to environmental index changes, making the zero-backscattering sensitive to environmental changes. We also show that by using two different types of nano-resonators in the unit cell, Fano resonances can be introduced to greatly enhance the switching sensitivity of zero-backscattering.

Authors:

Wang, Feng ^[1]; Wei, Qi -Huo ^[2]; Htoon, Han ^[1]

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+ Show Author Affiliations

1. Los Alamos National Lab. (LANL), Los Alamos, NM (United States)
2. Kent State Univ., Kent, OH (United States)

Publication Date:

Fri Feb 27 00:00:00 EST 2015

Research Org.:

Los Alamos National Lab. (LANL), Los Alamos, NM (United States)

Sponsoring Org.:

USDOE

OSTI Identifier:

1193787

Grant/Contract Number:  

ECCS-0824175

Resource Type:

Accepted Manuscript

Journal Name:

Optical Materials Express

Additional Journal Information:

Journal Volume: 5; Journal Issue: 3; Journal ID: ISSN 2159-3930

Publisher:

Optical Society of America (OSA)

Country of Publication:

United States

Language:

English

Subject:

77 NANOSCIENCE AND NANOTECHNOLOGY