Enhancement of the Second Harmonic Generation from WS₂ Monolayers by Cooperating with Dielectric Microspheres

Abstract

Herein, a 20‐fold enhancement of the optical second harmonic generation (SHG) from WS2 monolayers by cooperating with SiO2 dielectric microspheres (MSs) is reported. Detailed experiment and simulation studies indicate that the SHG enhancement is dominantly originated by the enhanced excitation intensity and enlarged collection efficiency produced by the SiO2 MSs. The size effect of the SiO2 MS on the SHG enhancement is also systematically investigated. Moreover, the SHG enhancement is found to be very sensitive to the surrounding refractive index of the SiO2 MS, which advocates great promise for the photonic sensing applications. This work provides a low‐cost and efficient approach to enhancing the SHG emission, and demonstrates great potential for functional nanodevices based on hybrid dielectric structures.

Influences of Ga Doping on Crystal Structure and Polarimetric Pattern of SHG in ZnO Nanofilms

“…[8,9]. For instance, SHG is a very sensitive and non-destructive technique for several applications in various fields, such as crystal structural detection, cancer cell diagnostics, optical switches in nano-devices [10,11,12,13,14,15]. Previous studies have demonstrated highly efficient SHG in different semi-conductor nanomaterials, such as CdS, GaAs, ZnO [16,17,18,19,20,21,22].…”

Carbon defect qubit in two-dimensional WS2

“…We estimate about 1 million counts per second total emission from a single neutral C defect based on radiative lifetime and estimated collection efficiency (19.1% in Ref. 43 ) which can be readily observed. The coherent ZPL emission would be in the order of 2500 counts per second which is still observable.…”

Lipid droplets as endogenous intracellular microlenses

“…2f , were much smaller than those of f 1 . The total enhancement factor f of the lipidic microlenses can then be calculated by f = f 1 × f 2 42 , and the results are presented by the red dots in Fig. 2f .…”