Bessel beam

About: Bessel beam is a research topic. Over the lifetime, 1946 publications have been published within this topic receiving 42264 citations.

Optically controlled rotation of multibeam light field

Abstract: We propose a method of rotation of higher-order Bessel light beams based on controlling phase difference between the interfering Bessel beam and a super-Gaussian or annular beam coaxial with it. TO realize the optically-controlled rotation of light field, a phase modulator based on quadratic or cubic nonlinearities can be used.

Lens and method for generating Bessel beam carrying orbital angular momentum based on super surface

Abstract: The invention discloses a lens and a method for generating Bessel beam carrying orbital angular momentum based on a super surface, relates to a technology for generating the Bessel beam carrying the orbital angular momentum and solves the problems of high processing precision requirement, low energy utilization rate and poor integration effect of the conventional method for generating the Bessel beam The lens comprises m*n phase mutation units which are periodically arranged, wherein each phase mutation unit comprises a substrate and a metal layer located on the surface of the substrate; the metal layer comprises two parts, wherein one part is a square metal layer arranged at the center of the substrate and the other part is a rectangular metal frame surrounding the square metal layer; a notch is arranged at the center of each of one group of opposite sides of the metal frame; one side of the substrate is taken as an x axis, an inclined angle between the connecting line of the center of the notch and the center of the substrate and the forward direction of the x axis is theta, (formula), circular polarized wave is vertically incident, and the transmission cross polarization wave is the Bessel beam carrying the orbital angular momentum The lens and the method are suitable for generating the Bessel beam carrying the orbital angular momentum

An integrated single- and two-photon non-diffracting light-sheet microscope

Abstract: We describe a fluorescence optical microscope with both single-photon and two-photon non-diffracting light-sheet excitations for large volume imaging. With a special design to accommodate two different wavelength ranges (visible: 400-700 nm and near infrared: 800-1200 nm), we combine the line-Bessel sheet (LBS, for single-photon excitation) and the scanning Bessel beam (SBB, for two-photon excitation) light sheet together in a single microscope setup. For a transparent thin sample where the scattering can be ignored, the LBS single-photon excitation is the optimal imaging solution. When the light scattering becomes significant for a deep-cell or deep-tissue imaging, we use SBB light-sheet two-photon excitation with a longer wavelength. We achieved nearly identical lateral/axial resolution of about 350/270 nm for both imagings. This integrated light-sheet microscope may have a wide application for live-cell and live-tissue three-dimensional high-speed imaging.