From Event: SPIE Optical Engineering + Applications, 2018
A novel optical architecture is designed and fabricated in order to overcome the limits of the traditional sorter based on log-pol optical transformation for the demultiplexing of optical beams carrying orbital angular momentum (OAM) of light. The proposed configuration simplifies the alignment procedure and significantly improves the compactness of the optical device. In addition, the integration of an optical fan-out provides higher resolution on OAM modes separation. Since the miniaturization level and the optical configuration require to operate beyond the paraxial approximation, a rigorous formulation of transformation optics in the non-paraxial regime is developed and applied for the first time. Samples have been fabricated as 256-level phase-only diffractive optics with high-resolution electron-beam lithography and tested for the demultiplexing of optical vortex superposition in a 8-bit free-space optical link. The results confirm the expected high efficiency and resolution in OAM sorting.
G. Ruffato, M. Girardi, M. Massari, E. Mafakheri, P. Capaldo, and F. Romanato, "Compact diffractive optics for high-resolution sorting of orbital angular momentum beams," Proc. SPIE 10744, Laser Beam Shaping XVIII, 107440L (Presented at SPIE Optical Engineering + Applications: August 21, 2018; Published: 14 September 2018); https://doi.org/10.1117/12.2322541.
Conference Presentations are recordings of oral presentations given at SPIE conferences and published as part of the proceedings. They include the speaker's narration with video of the slides and animations. Most include full-text papers. Interactive, searchable transcripts and closed captioning are now available for most presentations.
Search our growing collection of more than 18,000 conference presentations, including many plenaries and keynotes.