Resonantly Enhanced Second-Harmonic Generation Using III–V Semiconductor All-Dielectric Metasurfaces

Abstract

Abstract:Nonlinear optical phenomena in nanostructured materials have been challenging our perceptions of nonlinear optical processes that have been explored since the invention of lasers. For example, the ability to control optical field confinement, enhancement, and scattering almost independently, allows nonlinear frequency conversion efficiencies to be enhanced by many orders of magnitude compared to bulk materials. Also, the subwavelength length scale renders phase matching issues irrelevant. Compared with plasmonic nanostructures, dielectric resonator metamaterials show great promise for enhanced nonlinear optical processes due to their larger mode volumes. Here, we present, for the first time, resonantly enhanced second-harmonic generation (SHG) using Gallium Arsenide (GaAs) based dielectric metasurfaces. Using arrays of cylindrical resonators we observe SHG enhancement factors as large as 10 4 relative to 2 unpatterned GaAs. At the magnetic dipole resonance we measure an absolute nonlinear conversion efficiency of ~2 × 10 −5 with ~3.4 GW/cm 2 pump intensity. The polarization properties of the SHG reveal that both bulk and surface nonlinearities play important roles in the observed nonlinear process.

Optically resonant dielectric nanostructures

“…This corresponds to 1.5 × 10 5 enhancement of the THG signal relative to that from an unstructured Si film with the same thickness. Recent demonstrations also include enhancement of SHG in resonant nanopillars made of the high-index noncentrosymmetric III-V semiconductors GaAs (60) and AlGaAs (61). An enhancement factor of 10 4 relative to unstructured GaAs films is shown with total conversion efficiency of 2 × 10 −5 at a pump intensity of 3.4 GW/cm 2 .…”

Nickel‐Substituted Copper Hexacyanoferrate as a Superior Cathode for Aqueous Sodium‐Ion Batteries

“…Electrochemical energy storage technologies consisting of alkali-ion batteries, [1][2][3] sulfur batteries, [4][5][6] zinc batteries, [7][8][9] and air batteries [10][11][12] are being extensively studied for large-scale application in the field of renewable energies such as wind and solar. Among those technologies, aqueous sodium-ion batteries have attracted wide interests due to their advantageous properties including earth-abundant sodium resources, environment-friendly aqueous electrolytes and reliable battery safety.…”

Nonlinear optics on nano/micro-hierarchical structures on metals: focus on symmetric and plasmonic effects

“…Nonlinear optical phenomena in nanostructured materials have been challenging our perceptions of nonlinear optical processes that have been explored since the invention of lasers [1]. The symmetry parameter is important because the symmetry of nanostructures should have an influence on their dielectric property through the electric wave function in their constituent atoms and bondings.…”