Special beams, including the Airy beam and the vortex-embedded Airy beam, draw much attention due to their unique features and promising applications. Therefore, it is necessary to devise a straightforward method for measuring these peculiar features of the beams with ease. Hence we present the astigmatic transformation of Airy and Airy-vortex beam. The "acceleration" coefficient of the Airy beam is directly determined from a single image by fitting the astigmatically transformed beam to an analytic expression. In addition, the orbital angular momentum of optical vortex in Airy-vortex beam is measured directly using a single image.
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A Feasibility Study on 3-D Imaging of Intrahepatic Bile Ducts in Patients with Biliary Atresia Using Airy Beam Excited Two-Photon Microscopy.
Appl Biochem Biotechnol
December 2024
Department of General Surgery, Tianjin Children's Hospital, Beichen District, Longyan Road 238, Tianjin, 300134, China.
Article Synopsis
- This study aimed to use a two-photon microscope excitation Airy beam to create detailed 3D images of intrahepatic bile ducts in mice with bile duct ligation (BDL) and human patients with biliary atresia (BA).
- Ten BDL mice showed symptoms like jaundice and weight loss, with liver tissues sampled after 10 days, while 16 BA patients underwent either liver transplantation or Kasai portoenterostomy (KPE).
- The imaging revealed significant bile duct widening and hyperplasia in BDL mice and disorganized bile ducts in BA patients, particularly those who had liver transplants.
This work presents the generation of an Airy beam by a leaky-wave structure (LWS) designed from a substrate-integrated waveguide (SIW) with dimension-varying slots. The Airy beam is radiated by judiciously designing the length of the slots to modulate the phase distribution. Compared to Airy beams generated by phased array antennas or metasurfaces, no complex feeding network associated with phase shifters and no space-wave illumination is required, thus allowing one to reach a low-profile structure.
View Article and Find Full Text PDFIn this paper, the dynamics of the circular Airy beam (CAB) in the spatial fractional nonlinear Schrödinger equation (FNLSE) optical system are investigated. The propagation characteristics of CABs modulated by the quadratic phase modulation (QPM) in a Kerr (cubic) nonlinear medium under power function diffractive modulation modes and parabolic potentials are numerically simulated by using a step-by-step Fourier method. Specifically, the threshold for CABs to form solitons in the Kerr medium is controlled by the Lévy index and the QPM coefficient.
View Article and Find Full Text PDFElectron Airy beams and electron vortex beams are commonly generated using phase masks that imprint a transverse modulation on the particle wave function. Plasmons sustained by nanostructured conductors facilitate substantial interactions with free electrons, enabling considerable transverse modulation of the electron wave function. Consequently, electron Airy and vortex beams can also be produced through interactions between electrons and structured plasmonic fields.
View Article and Find Full Text PDFOptical pulling along straight trajectories has been successfully demonstrated for both dipolar and Mie particles using optical gradient and/or scattering forces over the past decade. However, much less attention is devoted to the pulling along curved paths, particularly for Mie particles, since the mechanism of continuous attraction based on intensity gradients is effective only for dipolar particles, thus limiting its practical applications. Here, we demonstrate the optical pulling of Mie particles with gain along a parabolic trajectory immersed in a two-dimensional vector Airy beam.
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