Deeply sub-wavelength epsilon near-zero (ENZ) films feature strong optical nonlinearities such as a giant Kerr effect and high four-wave mixing efficiency [1] , [2]. The enhanced nonlinear response is largely owed to the the slow-light effect consequent of the flat dispersion of the ENZ mode [3]. Here, we numerically investigate the hybridisation of this mode with plasmonic antennas decorated on top of the ENZ film. In this new regime, slow-light propagation can contribute significantly to the strong nonlinear response. However, unveiling the temporal dynam-ics necessitates use of time-resolved approaches which have not yet been undertaken. Therefore, we employed a finite-difference time-domain approach to study two representative ENZ media, namely Indium Tin Oxide (ITO) and Silicon Carbide (SiC) and with ENZ frequency ν ϵ0 = 211 × 10 12 Hz and ν ϵ0 = 29.1 × 10 12 Hz, respectively. In both cases, we quantify the slow-light effect by focusing on the group delay, δt (computed from the difference of electric field envelope centres of mass t in and t out at the input and output, respectively). As depicted in Fig. 1 , the delay depends on the excited mode (field polarisation) and shows maxima where strong coupling occurs.

Temporal Dynamics of Strongly Coupled Epsilon Near-Zero Plasmonic Systems

Faccio D.;Clerici M.
2021-01-01

Abstract

Deeply sub-wavelength epsilon near-zero (ENZ) films feature strong optical nonlinearities such as a giant Kerr effect and high four-wave mixing efficiency [1] , [2]. The enhanced nonlinear response is largely owed to the the slow-light effect consequent of the flat dispersion of the ENZ mode [3]. Here, we numerically investigate the hybridisation of this mode with plasmonic antennas decorated on top of the ENZ film. In this new regime, slow-light propagation can contribute significantly to the strong nonlinear response. However, unveiling the temporal dynam-ics necessitates use of time-resolved approaches which have not yet been undertaken. Therefore, we employed a finite-difference time-domain approach to study two representative ENZ media, namely Indium Tin Oxide (ITO) and Silicon Carbide (SiC) and with ENZ frequency ν ϵ0 = 211 × 10 12 Hz and ν ϵ0 = 29.1 × 10 12 Hz, respectively. In both cases, we quantify the slow-light effect by focusing on the group delay, δt (computed from the difference of electric field envelope centres of mass t in and t out at the input and output, respectively). As depicted in Fig. 1 , the delay depends on the excited mode (field polarisation) and shows maxima where strong coupling occurs.
2021
2021 Conference on Lasers and Electro-Optics Europe and European Quantum Electronics Conference, CLEO/Europe-EQEC 2021
978-1-6654-1876-8
2021 Conference on Lasers and Electro-Optics Europe and European Quantum Electronics Conference, CLEO/Europe-EQEC 2021
deu
2021
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Utilizza questo identificativo per citare o creare un link a questo documento: https://hdl.handle.net/11383/2172347
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