Bessel beam

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

Accelerating vortices in Airy beams

Abstract: Non-diffracting beams, such as Bessel and Mathieu beams, offer a wide range of potential applications in the fields of bio-photonics, micromanipulation and spectroscopy. One of the main features of these beams is their self-healing behavior where the beams reconstruct after an obstacle. Higher order versions of these beams incorporate non-diffracting optical singularities or vortices propagating together with the beams in a straight line. Vortices are ubiquitous in many parts of physics and their dynamics, especially their creation and annihilation processes are very important in fundamental physics. Newly demonstrated Airy beams represent a different class of non-diffracting beams that do not propagate in a straight line but exhibit a constant transversal acceleration. The self-healing properties of these Airy beams together with their transversal acceleration can be used to optically clear entire regions of microparticles. These Airy beams are created using a spatial light modulator that encodes a cubic phase front on an incident Gaussian beam. Using the same method and suitable computer generated holograms we are able to generate Airy like beams that include optical vortices. In this paper, we study the creation and evolution of Airy beam accelerating vortices from the theoretical and experimental perspective.

Extremely high-aspect-ratio ultrafast Bessel beam generation and stealth dicing of multi-millimeter thick glass

Abstract: We report on the development of an ultrafast beam shaper capable of generating Bessel beams of high cone angle that maintain a high-intensity hot spot with subwavelength diameter over a propagation distance in excess of 8~mm. This generates a high-intensity focal region with extremely high aspect ratio exceeding 10~000:1. The absence of intermediate focusing in the shaper allows for shaping very high energies, up to Joule levels. We demonstrate proof of principle application of the Bessel beam shaper for stealth dicing of thick glass, up to 1~cm. We expect this high energy Bessel beam shaper will have applications in several areas of high intensity laser physics.

Terahertz plasmonic Bessel beamformer

Abstract: We experimentally demonstrate terahertz Bessel beamforming based on the concept of plasmonics. The proposed planar structure is made of concentric metallic grooves with a subwavelength spacing that couple to a point source to create tightly confined surface waves or spoof surface plasmon polaritons. Concentric scatterers periodically incorporated at a wavelength scale allow for launching the surface waves into free space to define a Bessel beam. The Bessel beam defined at 0.29 THz has been characterized through terahertz time-domain spectroscopy. This approach is capable of generating Bessel beams with planar structures as opposed to bulky axicon lenses and can be readily integrated with solid-state terahertz sources.

Wavefront corrected light sheet microscopy in turbid media

Abstract: Light sheet microscopy is a powerful method for three-dimensional imaging of large biological specimens. However, its imaging ability is greatly diminished by sample scattering and aberrations. Optical clearing, Bessel light modes, and background rejection have been employed in attempts to circumvent these deleterious effects. We present an in situ wavefront correction that offers a major advance by creating an “optimal” light sheet within a turbid sample. Crucially, we show that no tissue clearing or specialized sample preparation is required, and clear improvements in image quality and depth resolution are demonstrated both in Gaussian and Bessel beam-based light sheet modalities.

Efficient generation of an arbitrary nondiffracting Bessel beam employing its phase modulation

Abstract: We report a highly efficient method for generation of any high-order nondiffracting Bessel beam employing a phase hologram whose transmittance coincides with the phase modulation of such a beam. It is remarkable that the Bessel beam generated by this hologram, at the plane of this device, has peak amplitude higher than the amplitude of the beam employed to illuminate it.