Working Paper Article Version 1 This version is not peer-reviewed

Large Negative Self-Defocusing Kerr Nonlinearity in 2D PdSe2 Dichalcogenide Films Measured by Z-Scan

Version 1 : Received: 1 May 2020 / Approved: 2 May 2020 / Online: 2 May 2020 (12:33:00 CEST)

How to cite: Jia, L.; Wu, J.; Yang, T.; Jia, B.; Moss, D.J. Large Negative Self-Defocusing Kerr Nonlinearity in 2D PdSe2 Dichalcogenide Films Measured by Z-Scan. Preprints 2020, 2020050009 Jia, L.; Wu, J.; Yang, T.; Jia, B.; Moss, D.J. Large Negative Self-Defocusing Kerr Nonlinearity in 2D PdSe2 Dichalcogenide Films Measured by Z-Scan. Preprints 2020, 2020050009

Abstract

We report a large third-order nonlinear optical response of palladium diselenide (PdSe2) films – a two-dimensional (2D) noble metal dichalcogenide material. Both open-aperture (OA) and closed-aperture (CA) Z-scan measurements are performed with a femtosecond pulsed laser at 800 nm to investigate the nonlinear absorption and nonlinear refraction, respectively. In the OA experiment, we observe optical limiting behaviour originating from large two photo absorption (TPA) in the PdSe2 film of β = 3.26 ×10-8 m/W. In the CA experiment, we measure a peak-valley response corresponding to a large and negative Kerr nonlinearity of n2 = -1.33×10-15 m2/W – two orders of magnitude larger than bulk silicon. We also characterize the variation of n2 as a function of laser intensity, observing that n2 decreases in magnitude with incident laser intensity, becoming saturated at n2 = -9.96×10-16 m2/W at high intensities. These results verify the large third-order nonlinear optical response of 2D PdSe2 as well as its strong potential for high performance nonlinear photonic devices.

Subject Areas

nonlinear optics

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