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Superluminal and slow femtosecond laser pulses in hyperbolic metamaterials in epsilon-near-zero regime

par Novikov, V. B.;Leontiev, A.P. ;Napolskii, K.S.;Murzina, T. V.
Référence Optics Letters, 46, 10, page (2276)
Publication Publié, 2021-05-01

Article révisé par les pairs

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Résumé :

Flourish of optics of hyperbolic metamaterials (HMMs) is stimulated by their exotic optical properties. Here, we demonstrate resonant changes of the group retardation and superluminal-like propagation of femtosecond laser pulses in nanorod-based HMMs in the vicinity of epsilon-near-zero spectral point responsible for the transition between topologically distinct elliptic and hyperbolic light dispersions. Resonant dynamics of ultrashort pulses appears in a unique case when their spectral components are in both dispersion regimes simultaneously. Our findings suggest HMMs as a powerful platform for future ultrafast photonics and are pivotal for growing nonlinear optics of hyperbolic media.