Finite-difference time-domain numerical study of ultrashort pulse propagation across sub-micron scale distances in Al:ZnO/ZnO at the epsilon near-zero spectral point

Priscilla Kelly; Lyuba Kuznetsova

doi:10.1117/12.2320830

19 September 2018 Finite-difference time-domain numerical study of ultrashort pulse propagation across sub-micron scale distances in Al:ZnO/ZnO at the epsilon near-zero spectral point

Priscilla Kelly, Lyuba Kuznetsova

Author Affiliations +

Proceedings Volume 10719, Metamaterials, Metadevices, and Metasystems 2018; 1071923 (2018) https://doi.org/10.1117/12.2320830
Event: SPIE Nanoscience + Engineering, 2018, San Diego, California, United States

Abstract

The epsilon-near-zero (ENZ) spectral region in metamaterials has shown unique opportunities for enhancing light-matter interactions, particularly due to the large variation of dielectric permittivity over a small frequency range. In this work, ultrashort pulse propagation at the ENZ point is investigated using both the split-step method approach to solving Nonlinear Schrödinger’s equation (NLSE) and the one-dimensional finite-difference time-domain (FDTD) method. We use an estimation for chromatic dispersion at the ENZ for the NLSE, and low input powers for the initial pulse to minimize nonlinearities for both methods. The permittivity for the AZO/ZnO structure was varied only in the AZO layer, which we estimated using Drude model. We found that the damping frequency, γ, in the Drude model has the most influence on pulse shaping during propagation as it relates to losses within the material. Results from our 1D FDTD simulations have shown soliton-like behavior for incoming ultrashort pulses with duration 100 fs in the ENZ region up to 300 nm lengths for γ = 1x10¹¹ and 1x10¹² Hz.

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Citation Download Citation

Priscilla Kelly and Lyuba Kuznetsova "Finite-difference time-domain numerical study of ultrashort pulse propagation across sub-micron scale distances in Al:ZnO/ZnO at the epsilon near-zero spectral point", Proc. SPIE 10719, Metamaterials, Metadevices, and Metasystems 2018, 1071923 (19 September 2018); https://doi.org/10.1117/12.2320830

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