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Bessel beam
About: Bessel beam is a research topic. Over the lifetime, 1946 publications have been published within this topic receiving 42264 citations.
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TL;DR: In this paper, the authors exploit the varying affinity of mesoscopic objects to a circularly symmetric optical landscape to demonstrate this effect and demonstrate separation of cells and chromosomes using a Bessel beam.
Abstract: In the optical domain, the gradient force may be exploited in optical tweezers to confine high-index particles to points of maximum light intensity [1]. This methodology has enabled key advances in biology enabling a deeper understanding of molecular motors and the properties of DNA. Optical traps have also enabled a wide range of studies in optical angular momentum, colloid science and microfluidics. Recent work has shown that extended, optically tailored landscapes can offer a mechanism by which to arrange and accumulate microparticles in pre-described arrays [2]). The ability to sculpt and reconfigure the optical potential energy landscape external to the sample is a key component of such studies. We
may add a tilt to the potential or, more generally, break symmetry, enabling unprecedented control over directed transport of particles [3] Three dimensional optical lattices may be used for sorting and fractionation of biological material in a microfluidic flow [4]. However it would be advantageous to be able to separate and even accumulate both biological and colloidal matter in the absence of any flow within any sample chamber. This would allow true compatibility of sorting and separation without the need to implement flows and microfluidic systems. We exploit the varying affinity of mesoscopic objects to a circularly symmetric optical landscape to demonstrate this effect and demonstrate separation of cells and chromosomes. The differing Kramers residence time in each part of the light pattern
leads to a thermally activated method for sorting based on their hopping probabilities within the rings of the Bessel beam. Whilst we employ a Bessel beam to elucidate and demonstrate the dynamics of the sorting other tailored landscapes can also be used.
1 citations
1 citations
Patent•
24 Nov 2014
TL;DR: In this paper, the Bessel beam was used for cutting an object using an axial cone lens and an image lens to increase the energy density of the beam emitted from the vessel.
Abstract: The present invention is directed to a cutting device using the optical device, and this, using a Bessel beam, optical instruments for cutting using a Bessel beam in accordance with an embodiment of the present invention, incident to the incident surface on which the incident laser beam (laser beam) axicon lens comprising the emitting surface of the laser beam is emitted in the Bessel beam (bessel beam); And it is arranged separately from the exit surface side of the axicon lens and includes an image lens to increase the energy density of the beam emitted from the vessel the axial cone lens. According to the present invention, when using the optical device using a Bessel beam for cutting the processed object, it is the depth of focus can be adjusted as the thickness and the like of the processing object even if different adjust the magnification of the image of the lens one optical there is an effect that it is possible to machine a wide range of processing the object using the device.
1 citations
TL;DR: In this article , the authors proposed an innovative architecture capable of generating Bessel beams at terahertz frequencies and featuring a dynamic control of the cover distance, which is expected to pave the way for the realization of the first tunable tera-hertz Bessel-beam launchers.
Abstract: Bessel-beam launchers are planar devices capable of focusing electromagnetic energy in their radiative near-field region in the form of Bessel beams. Bessel-beam launchers are typically designed to have certain static beam features over a given operating bandwidth in the microwave/millimeter-wave range. Here, taking cues from some recent advancements in the field, we propose innovative architectures capable of generating Bessel beams at terahertz frequencies and featuring a dynamic control of the cover distance. The ideas outlined in this Vision are expected to pave the way for the realization of the first tunable terahertz Bessel-beam launchers.
1 citations
02 Jan 2022
TL;DR: In this article , a Bessel beam was integrated into the LLSM without changing the optical configuration, achieving better spatiotemporal control of photoactivation, and the energy power required for optogenetic reactions was lower than 1 nW (or 24 mW/cm 2 ).
Abstract: Abstract Lattice lightsheet microscopy (LLSM) is modified with the aim of manipulating cellular behavior with subcellular resolution through three-dimensional (3D) optogenetic activation. In this study, we report a straightforward implementation of the activation source in LLSM in which the stimulating light can be generated by changing the spatial light modulator (SLM) patterns and the annual masks. As a result, a Bessel beam as a stimulation source is integrated into the LLSM without changing the optical configuration, achieving better spatiotemporal control of photoactivation. We show that the energy power required for optogenetic reactions is lower than 1 nW (or 24 mW/cm 2 ), and membrane ruffling can be activated at different locations within a cell with subcellular resolution. We also demonstrate guided cell migration using optogenetic stimulation for up to 6 h, where 463 imaging volumes are collected, without noticeable damage to cells.
1 citations