Dipole plasmon resonance induced large third-order optical nonlinearity of Au triangular nanoprism in infrared region

作者: Ziyu Chen , Hongwei Dai , Jiaming Liu , Hui Xu , Zixuan Li

DOI: 10.1364/OE.21.017568

关键词: Materials sciencePlasmonRefractive indexZ-scan techniqueOpticsDipoleAbsorption (electromagnetic radiation)Attenuation coefficientWavelengthSurface plasmon

摘要: Au triangular nanoprisms with strong dipole plasmon absorption peak at 1240 nm were prepared by wet chemical methods. Both numerical calculations and experiments carried out to investigate the optical properties of samples. Finite difference time domain (FDTD) Local Density States (LDOS) demonstrate that electric field enhancement large LDOS can be obtained tip areas nanoprisms. Z scan techniques used characterize nonlinear absorption, refraction, as well one- two-photon figures merit (W T, respectively) sample. The results show maximum refractive index around resonance wavelength nm, detuning from will lead decrease n2, while coefficient β doesn’t change much wavelength. This dependence n2 small enable sample satisfy all-optical switching demand W> 1 T< easily in a range 1200-1300 nm. These significant imply nanoprism is good candidate for future switches infrared communication region.

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