Chirality-selected second-harmonic holography with phase and binary amplitude manipulation

Abstract

<p>High-quality chirality-selected second-harmonic holography is achieved based on a Au–WS₂ interface by combining geometry phase and binary amplitude control.</p>

All-dielectric Phase-gradient Metasurface Performing High-efficiency Anomalous Transmission in the Near-infrared Region

“…What's more remarkable is that the anomalous transmission efficiency is as high as 96.1% at the central wavelength of 1504 nm. As far as we know, the value is far higher than most reported phase-gradient metasurfaces at present [2][3][4][5][6][7][8][9][10][11][12][13][14][15][16][22][23][24][25][26][27][28][29][30][31][32][33][34]. Fig.…”

“…In the past few years, because metasurface has the ability to modulate the characteristics of electromagnetic waves, such as polarization, phase, amplitude, and frequency through sub-wavelength microstructures. It has attracted a lot of attention in nanophotonics [1][2][3][4][5][6][7]. In 2005, Nicholas demonstrated a new class of metasurface optical devices based on the lo-cal phase modulation effect of Surface Plasma (SP) [8].…”

Control of light–valley interactions in 2D transition metal dichalcogenides with nanophotonic structures

“…Artificial anisotropic arrays in the 2D plane are also promising candidates that can modulate the phase gradient and thus the propagation of light. 46,47,90,97,98 All-dielectric photonic crystal (PhC) slabs without in-plane inversion symmetry (C2 symmetry) were employed for routing valley emissions from a WS 2 monolayer at room temperature (Fig. 5C).…”

“…5E-G). 46,90,98,100 The plasmonic metamaterials mainly play two roles in the process. First, the plasmonic metamaterials provide large local electric nearfields to enhance the nonlinear process, leading to a high second-harmonic conversion efficiency of 10 −6 .…”

“…First, the plasmonic metamaterials provide large local electric nearfields to enhance the nonlinear process, leading to a high second-harmonic conversion efficiency of 10 −6 . 98 Second, the plasmonic metamaterials modify the phase gradient of the fundamental-frequency light. The gradient further pumps the coherent SHG process and steers the paths of the nonlinear chiral photons (Fig.…”