Enhancement of unidirectional forward scattering and suppression of backward scattering in hollow silicon nanoblocks

Abstract

Manipulating the light scattering direction and enhancing directivity are important research areas in integrated nanophotonic devices. Herein, a novel, to the best of our knowledge, nanoantenna composed of hollow silicon nanoblocks is designed to allow directional emission manipulation. In this device, forward scattering is enhanced and backward scattering is restrained substantially in the visible region. Owing to electric dipole resonance and magnetic dipole resonance in this nanoantenna, Kerker’s type conditions are satisfied, and the directionality of forward scattering G F B reaches 44.6 dB, indicating good characteristics in manipulating the light scattering direction.

Dual-Wavelength Forward-Enhanced Directional Scattering and Second Harmonic Enhancement in Open-Hole Silicon Nanoblock

“…These findings have practical applications in the area of magneto-optics generation and the design of nanoantenna devices [ 14 , 15 ]. The main reason for the wide interest in silicon is its relatively high refractive index, high thermal resistance, low absorption and optical losses in the visible to near-infrared region compared to metallic materials [ 16 , 17 ]. Because of the high refractive index and low absorption properties of silicon, nanostructures can support electromagnetic multipole resonances when light interacts with them.…”