Xing Zhao

Bio: Xing Zhao is an academic researcher from Nankai University. The author has contributed to research in topics: Integral imaging & Image processing. The author has an hindex of 11, co-authored 39 publications receiving 259 citations. Previous affiliations of Xing Zhao include Hong Kong Polytechnic University.

A light-intensity-controlled microfiber-assisted Mach-Zehnder interferometer based on ethyl orange solution under 532 nm laser excitation

Abstract: A compact light-intensity-controlled Mach–Zehnder interferometer has been proposed by exploiting the photosensitivity of ethyl orange solution in combination with the evanescent field property of a microfiber-assisted Mach–Zehnder structure. We have experimentally investigated the influences of irradiation laser power density as well as weight percentage ratio of ethyl orange solution on the transmission spectral characteristics of the proposed microfiber-assisted fiber-optic interferometer. Experimental results indicate that the interference transmission spectra are highly sensitive to the applied excitation laser power density. An optimal ethyl orange weight percentage of 0.5 wt% has been experimentally acquired, with which the largest interference dip wavelength sensitivity reaches 0.02576 nm/(mW cm −2 ). Moreover, experimental observation on the transmission spectrum shows that the proposed MZI possesses good spectral reversibility, which ensures its applicability for practical applications.

Model of radial basis functions based on surface slope for optical freeform surfaces.

Abstract: The model fitting degree of optical freeform surfaces is of utmost design importance. We develop a model with radial basis functions based on the surface slope (RBF-slope) for optical freeform surfaces with asymmetric structures. The RBF-slope model improves the basis-function distribution for circular apertures and establishes a relationship between shape factor and local surface slope, which provides the model with better fitting ability than the conventional RBF model (RBF-direct); fitting experiments for off-axis conic surfaces, “bumpy” paraboloids, and the design of a single mirror magnifier demonstrate the efficacy of our approach. Our method can effectively improve aberration balancing of optical freeform surfaces, resulting in high-quality imaging.

Cross-lenticular lens array for full parallax 3-D display with crosstalk reduction

Abstract: As a 3-D display technology, stereoscopic imaging with lenticular lens sheet can only offer viewers the horizontal parallax. To reconstruct the 3-D image with parallax in both horizontal and vertical directions, the full parallax technique with micro-lens array was proposed. But due to the fabrication constraints and cost concerns of the micro-lens array, application of the full parallax technique is restricted in practice. In this paper we revisited the lenticular sheet method and cross-lenticular lens array formed by two lenticular sheets overlapped orthogonally. By analyzing the optical properties of this cross-lenticular lens array, we found that it has reasonable imaging qualities as a conventional micro-lens array. Besides, due to the poor optical property of the outskirt area of the cross-lenticular lens, the cross-lenticular lens array has better crosstalk suppression capability than the conventional one. Based on the analysis, in this paper, we used the proposed lens array to reconstruct a 3-D image and verified its practicability. The cross-lenticular lens array was found feasible to take the full parallax technique into commercial applications, with comparable advantages in terms of low-cost and easy fabrication over a large area.

Method and device for rapidly acquiring elemental image array based on camera array

Abstract: The invention discloses a method and a device for rapidly acquiring an elemental image based on a camera array, mainly aiming to solve the problem on acquiring an elemental image array and provide a simple and convenient elemental image array acquisition means for acquisition and application of the three-dimensional information of various scenes and naked-eye three-dimensional display At present, a lens array or a camera array are generally adopted for acquiring the elemental image array in an integrated imaging optical acquisition process For the traditional optical acquisition means, the elemental image array which is constituted by a large number of elemental images and is matched with the number of a lens array needs to be acquired, the defects of low acquisition speed, complex equipment and high manufacture cost are existent, and the traditional optical acquisition means cannot be popularized and applied in large scale The device disclosed by the invention comprises a 2*2 camera array of rectangular arrangement and an electronic computer According to the invention, by starting from the relevance among elemental images in an elemental image array acquired through integrated imaging, the elemental image array is acquired rapidly by using the camera array constituted by four cameras, and thus, the complexity and the cost of the device are reduced

I and i

Abstract: There is, I think, something ethereal about i —the square root of minus one. I remember first hearing about it at school. It seemed an odd beast at that time—an intruder hovering on the edge of reality. Usually familiarity dulls this sense of the bizarre, but in the case of i it was the reverse: over the years the sense of its surreal nature intensified. It seemed that it was impossible to write mathematics that described the real world in …

Generation of the "perfect" optical vortex using a liquid-crystal spatial light modulator

Abstract: We introduce the concept of the perfect optical vortex whose dark hollow radius does not depend on the topological charge. It is shown analytically and experimentally that such a vortex can be approximately generated in the Fourier transforming optical system with a computer-controlled liquid-crystal spatial light modulator.

Advances in ultra-precision machining of micro-structured functional surfaces and their typical applications

Abstract: Micro-structured functional surfaces have achieved widespread applications in various advanced scientific, technological, industrial, and engineered fields due to their excellent performances, which are vitally limited by their feasible fabrication. Currently, ultra-precision machining, typically including ultra-precision diamond turning, ultra-precision diamond milling, ultra-precision diamond scratching, ultra-precision grinding, and ultra-precision polishing, is developed as a very-promising solution for the micro-structured functional surface fabrication with high quality, high efficiency, high flexibility, and low cost. Therefore, this paper aims to briefly review the current state of the art in the investigation into ultra-precision machining characteristics of micro-structured functional surfaces with a focus on their typical advanced applications as the significant achievements of their ultra-precision machining fabrication, discuss the key challenges, and further provide new insights into ultra-precision machining of micro-structured functional surfaces for the future research and their further advanced applications.

Nanophotonic projection system.

Abstract: Low-power integrated projection technology can play a key role in development of low-cost mobile devices with built-in high-resolution projectors. Low-cost 3D imaging and holography systems are also among applications of such a technology. In this paper, an integrated projection system based on a two-dimensional optical phased array with fast beam steering capability is reported. Forward biased p-i-n phase modulators with 200MHz bandwidth are used per each array element for rapid phase control. An optimization algorithm is implemented to compensate for the phase dependent attenuation of the p-i-n modulators. Using rapid vector scanning technique, images were formed and recorded within a single snapshot of the IR camera.