title: Three-dimensional grating nanowires for enhanced light trapping.
abstract: We propose rationally designed 3D grating nanowires for boosting light-matter interactions. Full-vectorial simulations show that grating nanowires sustain high-amplitude waveguide modes and induce a strong optical antenna effect, which leads to an enhancement in nanowire absorption at specific or broadband wavelengths. Analyses of mode profiles and scattering spectra verify that periodic shells convert a normal plane wave into trapped waveguide modes, thus giving rise to scattering dips. A 200 nm diameter crystalline Si nanowire with designed periodic shells yields an enormously large current density of ∼28  mA/cm2together with an absorption efficiency exceeding unity at infrared wavelengths. The grating nanowires studied herein will provide an extremely efficient absorption platform for photovoltaic devices and color-sensitive photodetectors.
authors.forename: Hoo-Cheol
authors.initials: HC
authors.lastname: Lee
authors.forename: Jin-Young
authors.initials: JY
authors.lastname: Na
authors.forename: Yoon-Jong
authors.initials: YJ
authors.lastname: Moon
authors.forename: Jin-Sung
authors.initials: JS
authors.lastname: Park
authors.forename: Ho-Seok
authors.initials: HS
authors.lastname: Ee
authors.forename: Hong-Gyu
authors.initials: HG
authors.lastname: Park
authors.forename: Sun-Kyung
authors.initials: SK
authors.lastname: Kim