Journal of The Optical Society of America A-optics Image Science and Vision最新文献

Three-dimensional (3D) reconstruction using line-structured-light-based stereo vision is one key technique in the field of computer vision measurement. However, most existing stereo vision methods are static and have limited measurement range. To overcome the defect in static stereo vision, a 3D reconstruction method for sparsely textured surfaces via freely moving line-structured-light-based binocular stereo vision is proposed in this paper. The light stripes projected on the surface are captured by left and right cameras, and the pixel coordinates of the light strips are extracted by the Steger algorithm. The 3D coordinates of the light stripes at each position of the cameras are calculated based on the principle of binocular intersection measurement. Subsequently, at least six feature points are required to estimate the coarse relative rotation and translation between adjacent positions, and the corresponding precise values are computed based on minimization of pixel reprojection errors. The camera pose at each position is ultimately obtained through step-by-step backward propagation by using the relative rotation and translation between all adjacent positions. Thus, the 3D shape of the surface is obtained quickly once the light strips captured at different positions are unified to the reference position. Moreover, two metallic surfaces with different geometric configurations are used for the 3D reconstruction test, and the 3D shapes of the metallic surfaces are reconstructed effectively, which proves the generalizability of the proposed method to different surface types. To evaluate the accuracy of 3D reconstruction, the 3D point cloud of one metallic plane is fitted into a plane, and the average vertical distance of the 3D point cloud from the fitting plane is regarded as the evaluation criterion. The experimental results reflect that the average vertical distance in each experimental trial and the average value of the standard deviation of vertical distance do not exceed 1.52 and 0.97 mm, respectively.

We characterize the streamlines and polarization structure of the modified vector Mathieu-Gauss (mvMG) beams, a class of vector solutions to the paraxial Maxwell equations in elliptic cylindrical coordinates. We derive analytical expressions for the TE and TM modes and demonstrate that their streamlines can be obtained either exactly or via asymptotic and trigonometric approximations. Furthermore, we explore superpositions of the TE and TM modes, including circularly polarized helical beams, and provide closed-form expressions for the corresponding streamlines and Stokes parameters. Our results reveal the topological richness of mvMG beams and offer new tools for their description, with potential applications in structured light, optical singularities, and beam shaping in non-Cartesian coordinate systems.

Theoretical analysis revealed that the backscattering efficiency of an isotropic chiral sphere is independent of the polarization state of the incident plane wave, whereas the extinction, total scattering, absorption, and forward-scattering efficiencies are generally not. Furthermore, the handedness of the backscattered field in the far zone is the reverse of that of the incident plane wave. Finally, there can be non-zero values of the chirality parameter such that either the extinction, total scattering, absorption, or forward-scattering efficiency is also independent of the polarization state of the incident plane wave.

The present erratum is intended to make corrections to several equations in our paper [J. Opt. Soc. Am. A42, 362 (2025)JOAOD60740-323210.1364/JOSAA.547743]. The related numerical results are updated accordingly.

The probe serves as a pivotal component in scanning near-field optical microscopy, enhancing its imaging resolution by capturing high-frequency information within the sample's near-field region. However, a current limitation exists: a single probe can only respond to either the transverse or longitudinal vector field independently. This single polarization response not only escalates imaging costs but also leads to a loss of imaging information, thereby narrowing the application scope of scanning near-field microscopy. In this work, we propose a nano-plasmonic probe that has two transmission modes and can characterize the transverse and longitudinal near-fields using a single system. The proposed nano-plasmonic probe has a nanoparticle-on-aperture in the film structure that is designed on a tapered fiber tip. Finally, the feasibility of the fabrication of the nano-plasmonic probe using optical tweezers technology is analyzed and studied. This nano-plasmonic probe shows great potential for use in near-field optical microscopy applications.

This work introduces a wideband aberration-corrected high-resolution (WACHR) spectrometer. The design replaces the conventional collimating mirror and planar grating in the Czerny-Turner configuration with a toroidal diffraction grating. Theoretical modeling and optical simulations demonstrate that this configuration simultaneously suppresses astigmatism and wavelength-dependent coma across a broad spectral range. Compared with traditional designs, the proposed spectrometer exhibits superior imaging performance and higher spectral resolution, achieving 0.51-0.68 nm over 400-800 nm. A prototype was fabricated and experimentally validated, and the results confirm the theoretical predictions. These findings highlight the potential of the WACHR spectrometer for compact and high-precision spectral imaging applications.

With the rapid advancement of three-dimensional (3D) imaging technologies, 3D data has been increasingly utilized in areas such as medical diagnostics, digital heritage preservation, and virtual reality, where protecting sensitive spatial information is essential. To address this need, 3D information hiding aims to securely embed depth data into a host image without introducing perceptible visual distortions. Unlike conventional two-dimensional (2D) information hiding, which focuses on pixel-level planar data, 3D hiding must preserve spatial structure, geometric consistency, and depth fidelity-posing greater challenges in terms of capacity, imperceptibility, and robustness. In this work, we propose, to our knowledge, a novel 3D information hiding method that integrates single-pixel imaging with diffusion models. A dual-stage encryption framework is employed to enhance both confidentiality and imperceptibility. Additionally, we introduce an adaptive weight allocation strategy that prioritizes regions of interest, thereby improving both hiding performance and recovery accuracy. Experimental results demonstrate that the proposed method significantly outperforms existing approaches in terms of hiding and recovery performance, showing strong potential for practical deployment in secure 3D data transmission and storage.

A surface S is said to be an eigensurface of a mirror M if the reflection of S in M appears undistorted. In that case, M is the eigenmirror corresponding to the eigensurface S. Rotationally symmetric eigenmirror/eigensurface pairs are easy to construct, but the situation for freeform mirrors requires consideration of a partial differential equation, the anti-eikonal equation. Here, we investigate freeform quadric eigenmirrors, classifying them into five families. In each case, the eigensurfaces are biquadratic, i.e., they satisfy equations of the form ψ(x²,y²,z²)=0, where ψ is a quadric polynomial. Lastly, we investigate some more general hypotheses and a connection to dynamical systems.

In this paper, an ultra-low-loss hollow-core anti-resonant fiber (HC-ARF) operating in the near-infrared band is proposed. The ARF is based on six nested circular tubes made of silica. Then a straight rod is added to the nested inner circular tube to reduce the transmission loss. The low-loss transmission performance of the HC-ARF is analyzed in detail using the finite element method, and the structural parameters are further optimized. The results show that the confinement loss is lower than 7.91×10^-7dB/m in the range of 1.54-1.78 µm. Especially the confinement loss is as low as 1.31×10^-7dB/m at 1.55 µm. In addition, the HC-ARF has good bending resistance. The bending loss can be kept below 8.02×10^-5dB/m as the bending radius is larger than 5 cm. The performance of the designed ARF is significantly better than previously reported results, and the cladding structure of the ARF is simple and easy to process. It has great potential for commercial applications.

In this paper, we present a new optical device, to our knowledge, an axicon lens, which, for finite objects, sends the image radially to infinity. This axicon lens has a negative refractive index and is free from spherical aberration. Shown are several examples that, through ray tracing, confirm the functioning of this new artifact.