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Proceedings Paper

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
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Paper 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.

Paper Details

Date Published: 19 September 2018
PDF: 6 pages
Proc. SPIE 10719, Metamaterials, Metadevices, and Metasystems 2018, 1071923 (19 September 2018); doi: 10.1117/12.2320830
Show Author Affiliations
Priscilla Kelly, San Diego State Univ. (United States)
Lyuba Kuznetsova, San Diego State Univ. (United States)

Published in SPIE Proceedings Vol. 10719:
Metamaterials, Metadevices, and Metasystems 2018
Nader Engheta; Mikhail A. Noginov; Nikolay I. Zheludev, Editor(s)

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