Abstract
We investigate the nonlinear optical properties of BiOBr nanoflakes—a novel two-dimensional (2D) layered material from the bismuth oxyhalide family. We measure the nonlinear absorption and Kerr nonlinearity of BiOBr nanoflakes at both 800 nm and 1550 nm via the Z-Scan technique. We observe a large nonlinear absorption coefficient β ∼ 10−7 m/W as well as a large Kerr coefficient n2 ∼ 10−14 m2/W. We also observe strong dispersion in n2, with it reversing sign from negative to positive as the wavelength varies from 800 nm to 1550 nm. In addition, we characterize the thickness-dependence of the nonlinear optical properties of BiOBr nanoflakes, observing that both the magnitudes of β and n2 increase for very thin flakes. Finally, we integrate BiOBr nanoflakes onto silicon integrated waveguides and characterize the linear optical properties of the resulting hybrid integrated devices, with the measurements agreeing with calculated parameters using independent ellipsometry measurements. These results verify the strong potential of BiOBr as an advanced nonlinear optical material for high-performance hybrid integrated photonic devices.
Highlights
All-optical signal processing based on nonlinear photonic devices has provided a competitive solution to realize ultrafast information processing in modern communications systems1–4 with its broad operation bandwidth, low power consumption, and potentially reduced cost
We investigate the nonlinear optical properties of BiOBr nanoflakes—a novel two-dimensional (2D) layered material from the bismuth oxyhalide family
Two-dimensional (2D) layered materials such as graphene,5,6 graphene oxide (GO),7–9 transition metal dichalcogenides (TMDCs),10–12 and black phosphorus (BP)13,14 have attracted significant interest in recent years. Their remarkable optical properties, such as ultrahigh Kerr optical nonlinearities, strong nonlinear absorption, significant material anisotropy, and layer-dependent material properties have already enabled diverse new photonic devices that are fundamentally different from those based on traditional bulk materials
Summary
All-optical signal processing based on nonlinear photonic devices has provided a competitive solution to realize ultrafast information processing in modern communications systems with its broad operation bandwidth, low power consumption, and potentially reduced cost. Two-dimensional (2D) layered materials such as graphene, graphene oxide (GO), transition metal dichalcogenides (TMDCs), and black phosphorus (BP) have attracted significant interest in recent years Their remarkable optical properties, such as ultrahigh Kerr optical nonlinearities, strong nonlinear absorption, significant material anisotropy, and layer-dependent material properties have already enabled diverse new photonic devices that are fundamentally different from those based on traditional bulk materials.. We integrate the BiOBr nanoflakes onto silicon integrated waveguides and measure the insertion loss of the hybrid integrated devices, with the extracted waveguide propagation loss showing good agreement with mode simulations based on ellipsometry measurements These results confirm the strong potential of BiOBr as a promising nonlinear optical material for high-performance hybrid integrated photonic devices
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