2020/02/22 by Seyedeh Hamideh Kazemi, Mohammad Mahmoudi, Kazemi, Seyedeh Hamideh +2
Engineering · Medicine · Physics and Astronomy · #Advanced Fiber Laser Technologies #Atomic Physics (physics.atom-ph) #FOS: Physical sciences #Laser Applications in Dentistry and Medicine #Optics (physics.optics) #Orbital Angular Momentum in Optics #Photonic and Optical Devices #Plasmonic and Surface Plasmon Research #Quantum Physics (quant-ph)
paper · pdf · doi:10.48550/arxiv.2002.09697
openalex publication_date 2020/02/22 · openalex created_date 2023/03/08 · openalex updated_date 2026/07/28
Recently, the generation and detection of structured light field have drawn a\ngreat deal of attention, due to their importance in high-capacity optical data\nstorage and quantum technology. In this letter, we explore the azimuthal\nmodulation of optical transparency in a four-level double-V type quantum system\nnear a plasmonic nanostructure. A Laguerre-Gaussian beam and the interaction of\nthe system with free-space vacuum modes have been employed to create the\nphase-dependent absorption of a non-vortex probe field. First, we demonstrate\nhow to identify the azimuthal index associated with the conventional LG beam\nvia measuring the probe absorption so that the phase information of such a beam\ngets encoded on the spatially-dependent absorption profile with\nangularly-distributed lobes. Also, a spatially-varying optical transparency can\nbe formed, due to the periodic variation of the absorption spectrum. Then,\nasymmetrical Laguerre-Gaussian beams are used to extend the selective spatial\ntransparency mechanism to asymmetric spatially-structured windows, allowing for\noptical manipulation of spatial modes at arbitrary positions. Moreover, we\ninvestigate the influence of the asymmetric parameter on the features of the\nspatial inhomogeneities and show how the beams enable us to imprint the phase\ninformation of the orbital angular momentum at a desired position.\n