To achieve this high-precision and three-dimensional beam shaping and detection, we propose an approach based on precise variation of indices in the superposition of higher-order Laguerre-Gaussian beams and cylindrical vector beams in a counter-propagation scheme. The superposition is analyzed ...
j. Each of the two azimuth detectors, which are perpendicular to each other, can reconstruct the angle of the beam incident at the centre of the two pixels. For example,α1,1andβ1,2can be used to calculate the 3D angle
Using the scattered field finite difference time domain (FDTD) formalism, equations for a plane wave incident from a dense medium onto lossy media are derived. The Richards-Wolf vector field equations are introduced into the scattered field FDTD formalism to model an incident focused beam. The res...
Assuming the Gaussian beam approximation to be valid, Eq. (2) can be rewritten as: N.A.∼n⋅λ/(π⋅ω0) (3) with λ being the wavelength of the laser. We filled our sample chamber with glycerol with a refractive index of 1.47. Laser illumination of 488 nm resulted then in ...
Through modulating the Bessel-Gaussian radially polarized vector beam by the cosine synthesized filter under a reflection paraboloid mirror system with maximum focusing semi-angle of π/2, arbitrary-length super-Gaussian optical needles are created with consistent beam size of 0.36λ (full width at ha...
When l = 1, Equation (5) describes the electric field of a radially or azimuthally polarized beam with annular intensity distribution. Light beams with radial and azimuthal polarizations are the most well-known cylindrical vector beams with phase (scalar) and polarization (vector) singularities. ...
Therefore, the vector light field generation method based on an SLM is widely used. For example, Ding’s research group [23] divided the incident beam into two beams from a computer-generated hologram (CGH) written to the SLM. Each beam is encoded using the specified complex field, and ...
printed microparticles for potential pharmaceutical applications. The critical high-quality micro-optical components of the setup, namely a diffractive optical element generating the 7 × 7 beamlets and a 7 × 7 lens array, are manufactured by using a commercial two-photon grayscale 3D laser ...
In this study, we demonstrate that any complex nanostructure that belongs to Cn, with n≥3, symmetry point group for along at least one dimension displays apolar linear response to light input when the incoming wave vector is parallel to the Cn axis. Triangle and star shaped gold nanoparticles...
Three-dimensional surface profile measurement using a beam scanning chromatic confocal microscope立体视觉3D成像立体视觉字面意思是用一只眼睛或两只眼睛感知三维结构,一般情况下是指从不同的视点获取两幅或多幅图像重构目标物体3D结构或深度信息. 深度感知视觉线索可分为 Monocular cues 和 Binocular cues(双目视差). ...