Investigation on refractive index sensing of single silver nanoparticle at tightly focused light illumination

Based on the generalized Mie theory, refractive index sensing characteristics of single silver nanoparticle respectively illuminated by tightly focused linearly-polarized and radially-polarized light beams are investigated. The spectra for localized surface plasmon resonances (LSPR) under different dielectric environments demonstrate that distinct dipolar and quadrupolar resonances can be always observed for the case of radial polarization, while there is only strong dipolar resonance for the case of linear polarization. The dipolar mode has a higher sensitivity. However, the figure of merit (FOM) for the quadrupolar resonance is much higher than that for the dipolar resonance, because the quadrupolar resonance has a narrower width.     

Second harmonic generation of metal nanoparticles under tightly focused illumination

The near-field and far-field second harmonic(SH) responses of a metal spherical nanoparticle placed in the focal region of a highly focused beam are investigated by using the calculation model based on three-dimensional finite-difference time-domain(FDTD) method. The results show that off-axis backward-propagating SH response can be reinforced by tightly focusing, due to the increase of the relative magnitude of the longitudinal field component and the phase shift along the propagation direction.     

After Effects玻璃质感的表现

自然界中存在着各种各样的物质,每种不同的物质都有自己独特的质感,如金属、玻璃、木料等,我们在进行片头制作的过程中经常要对这些质感进行模拟.以丰富我们的片头要素。三维软件自然是模拟这些质感的首选软件,但是三维软件操作繁琐,参数众多,掌握起来有一定的难度,那么用其它软件是否能够做到这一点呢?现在我们就一起来探讨一下在After Effects中对于玻璃质感的制作,制作一个由液体慢慢演变成玻璃文字的例子。