作者: Ziyu Chen , Hongwei Dai , Jiaming Liu , Hui Xu , Zixuan Li
DOI: 10.1364/OE.21.017568
关键词: Materials science 、 Plasmon 、 Refractive index 、 Z-scan technique 、 Optics 、 Dipole 、 Absorption (electromagnetic radiation) 、 Attenuation coefficient 、 Wavelength 、 Surface 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.