Manipulation of nonlinear optical responses in layered ferroelectric niobium oxide dihalides.

ABSTRACT: Realization of highly tunable second-order nonlinear optical responses, e.g., second-harmonic generation and bulk photovoltaic effect, is critical for developing modern optical and optoelectronic devices. Recently, the van der Waals niobium oxide dihalides are discovered to exhibit unusually large second-harmonic generation. However, the physical origin and possible tunability of nonlinear optical responses in these materials remain to be unclear. In this article, we reveal that the large second-harmonic generation in NbOX₂ (X = Cl, Br, and I) may be partially contributed by the large band nesting effect in different Brillouin zone. Interestingly, the NbOCl₂ can exhibit dramatically different strain-dependent bulk photovoltaic effect under different polarized light, o

SUBMITTER: Ye L 

PROVIDER: S-EPMC10516934 | biostudies-literature | 2023 Sep

REPOSITORIES: biostudies-literature