2013/09/30 by Paul Bierdz, Minho Kwon, Connor Roncaioli +1 · 30 citations
Materials Science · Physics and Astronomy · #Angular momentum #Crosstalk #Metamaterials and Metasurfaces Applications #Optical vortex #Orbital Angular Momentum in Optics #Orbital angular momentum of light #Random lasers and scattering media #Spectrometer #Structured light #Vortex #physics.optics
paper · pdf · doi:10.1088/1367-2630/15/11/113062
published in New Journal of Physics 15(11), 113062 (IOP Publishing) · 14 pages, 5 figures
openalex publication_date 2013/11/29 · arxiv created 2014/01/11 · arxiv updated 2014/01/14 · openalex created_date 2016/06/24 · openalex updated_date 2026/08/08
We demonstrate high-fidelity detection of the orbital angular momentum (OAM) of light using a compact and practical OAM spectrometer that maps the OAM spectrum to time. The spectrometer consists of a single optical delay loop to achieve timing mapping, a vortex phase plate that iteratively decreases the OAM value and a single mode fiber to distinguish zero from non-zero OAM states. Light with arbitrarily OAM compositions can be measured. For light with OAM up to 4ℏ, we measured an average crosstalk of −21.3 dB, which is mainly limited by the purity of the input states and optical alignment.