Abstract
Super-resolution focused light spots are always expected in scanning optical microscopy. There are bright focused light spots and dark focused spots in stimulated emission depletion (STED) microscopy. The latter dark spot is normally generated by focusing a linearly polarized beam with spiral phase. In this work, we generated a super-resolution optical tube by tightly focusing a binary phase modulated azimuthally polarized laser beam. The binary phase modulation is achieved by a glass substrate with multi-belt concentric ring grooves. We also characterized the 3D beam profile by using a cross-shaped knife-edge fabricated on a silicon photo-detector. The size of the super-resolution dark spot in the tube is 0.32λ, which remains unchanged for ~4λ within the tube. This optical tube may find applications in super-resolution microscopy, optical trapping and particle acceleration.
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.
