KEYWORDS: Polaritons, Phonons, Nanoantennas, Photon polarization, Free space optics, Near field optics, Dispersion, Near field scanning optical microscopy, Free space, Boron
In this study, by using numerical simulations and scanning near-field optical microscopy, we investigate the excitation of HPhPs in MoO3 with plasmonic nanoantennas. We find that the excitation efficiency is strongly dependent on the antenna length and orientation. By changing the size, shape and direction of the metal antenna, the excitation of the phonon Polariton mode can be controlled.
The third-order nonlinear optical properties of graphene oxide (GO) dispersion in distilled water were investigated in femtosecond regime, using a single beam z-scan technique. Induced by a focused Gaussian beam (λ~800 nm) with 150 fs pulse duration, the graphene oxide shows strong nonlinear absorption, which was dominated by reverse saturable absorption (RSA), originates from two-photon absorption (TPA) in GO. In addition, the optical limiting performance of GO was experimentally derived, indicating that the occurrence of RSA make GO a candidate for optical limiting. In addition, the further increasing of input intensity would enhance the nonlinear scattering effects in the sample so that the optical limiting threshold was reached.
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