Regensburg 2025 – scientific programme

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CPP: Fachverband Chemische Physik und Polymerphysik

CPP 32: Poster Session II

CPP 32.13: Poster

Thursday, March 20, 2025, 09:30–12:00, P3

Second order nonlinear optical properties of hexagonal boron nitride nanosheets h-BNNs — •Dina Atwa Khalil and G. Omar — Laser Institute for Research and Applications, Beni-Suef University, Egypt

The superior optical characteristics of hexagonal boron nitride nanosheets (h-BNNs) have been drawing more attention in the past few years. However, scientists have not yet thoroughly studied the nonlinear optical (NLO) properties of such innovative material. Here, NLO characteristics of h-BNNs are investigated for the first time utilizing the Z-scan approach that had been irradiated with 100 fs laser pulses using different excitation wavelengths that started from 740 to 820 nm at a constant incident power of 1 W. The studied 2D nanomaterial was prepared by a straightforward and effective technique for producing (h-BNNs), which is mechanical exfoliation. Their morphology and crystal structure have been investigated using different techniques, including UV-vis spectroscopy, scanning electron microscopy (SEM), transmission electron microscopy (TEM), and Raman spectroscopy. The measurements of nonlinearity show that by increasing the excitation wavelength, the nonlinear absorption coefficient decreases in a linear trend. The as prepared h-BNNs performed fascinating optical limiting with excellent two-photon absorption. This innovative optical nanomaterial makes them promise for sensitive optical components and laser protection applications.

Keywords: Mechanical exfoliation; 2D nanomaterial; Nonlinear optical properties; Z-scan apparatus; h-BNNs