Figure 2 | The wavelength-scanned and polarization-dependent nonlinear optical spectroscopy results are in excellent agreement with numerical simulations based on the hydrodynamic model. (IMAGE)
Caption
Figure 2 | The wavelength-scanned and polarization-dependent nonlinear optical spectroscopy results are in excellent agreement with numerical simulations based on the hydrodynamic model. a Wavelength-dependent SHG spectra under excitation with varying fundamental wavelengths. For x-polarized excitation along the dimer long axis, the SHG intensity reaches a maximum at ~970 nm, close to the MD resonance, in good agreement with numerical simulations based on a hydrodynamic model; under y-polarized excitation, the SHG remains weak and shows no pronounced resonance. b Polarization-resolved detection results further reveal that for x-polarized excitation the SHG signal polarized along x (dominated by the Lorentz term) exceeds the SHG signal polarized along y (dominated by the convective term) by more than an order of magnitude. Under y-polarized excitation the two detection polarizations are comparable, indicating that, in the absence of MD resonance, SHG is primarily governed by vertical electric dipoles (convective and Coulomb term).
Credit
Wang, Y., Razdolski, I. et al.
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CC BY