Abstract
An optical vortex with light-emitting diode (LED) as the light source has been studied. The vortex beam is generated by a zero-order vortex half-wave retarder (VHWR). This VHWR generates nondiffracting Bessel beams which can be used in optical tweezers to trap particles. LEDs have a wide range of applications in various fields, and are here used as the source of vortex beam. The characterization of the topological charges and magnitudes of vortex beam has been done using the near-field Talbot effect. The influence of the size of the Gaussian beam is also studied in this work. We provide both theory and experimental demonstration. In addition, we found that the phase selection of the wave function in the Fresnel integral can be used to check the correct direction of topological charge of vortex beam. Our study might be useful for applications in optical communication, microscopic manipulation, and trapping using LED as the light source.
Sign-in/Register to access full text options 
Talk to us
Join us for a 30 min session where you can share your feedback and ask us any queries you have
Schedule a callDisclaimer: All third-party content on this website/platform is and will remain the property of their respective owners and is provided on "as is" basis without any warranties, express or implied. Use of third-party content does not indicate any affiliation, sponsorship with or endorsement by them. Any references to third-party content is to identify the corresponding services and shall be considered fair use under The CopyrightLaw.
