Complex Frequency Analysis of Coupled Plasmonic Systems (Invited)

Fig. 1. Schematic diagram and numerical simulation results of coupled plasmonic periodic structure. (a) Structural parameters; (b) transmission spectra of same polarization $T_{u u}$ and orthogonal polarization $T_{u v}$ under incident light with polarization angle $θ_{u}$ ; (c) transmission spectra of same polarization $T_{v v}$ and orthogonal polarization $T_{v u}$ under incident light with polarization angle $θ_{v}$ ; (d) transmission spectra of same polarization $T_{y y}$ and orthogonal polarization $T_{y x}$ under incident light with polarization angle $θ_{y}$

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Fig. 2. Comparison of numerical simulation and theoretical fitting results of transmission coefficient. (a) Transmission amplitude $|t_{u u}|$ ; (b) transmission amplitude $|t_{v v}|$ ; (c) transmission phase arg $t_{u u}$ ; (d) transmission phase arg $t_{v v}$

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Fig. 3. Transmission spectra of real frequency and complex frequency excitation. (a)(b) $T_{y y}$ and $T_{y x}$ under different virtual gain factors $τ$ conditions, $γ = γ_{u}$ ; (c)(d) $T_{y y}$ and $T_{y x}$ of real frequency excitation under different coupling intensity (different gap $d$ ) conditions; (e)(f) $T_{y y}$ and $T_{y x}$ of complex frequency excitation under different coupling intensity (different gap $d$ ) conditions, $τ = 1.4 γ_{u}$