This work presents propagation dynamics of structured light (complex light) containing optical vortices after it has undergone multiple reflections in a spiral phase plate (SPP) device having a nonzero surface reflection. In the calculations, the thick-plate approximation is assumed as it is expected to give a more accurate representation of the standard geometry of an SPP device from a low-surface reflection to a high-surface reflection. Calculations showing the propagation of counter-rotating optical vortices are presented, and the effect of the statistical nature of photons on the observation of the angular intensity modulation of the beam is discussed.
Tuning vector vortex in spatially coherent multicolored beam is studied. A wavelength filter based on the tunable modal properties of light is experimentally demonstrated, and the polarization topology of optical beam profile is mapped. A hybrid mode-wavelength division multiplexing (HMWDM) scheme is proposed. In this scheme information is encoded in the wavelength of light, and the spatial mode and polarization modulation about the optical mode is used to turn on and off frequency channels. This scheme is applicable to increase information capacity of light and in high resolution microscopy.
A spatially incoherent white light optical vortex is generated using a tunable liquid crystal q-plate and white lamp source. This work investigates the propagation of incoherent vector vortex to the far field, and makes comparisons with a coherent optical vortex at a particular wavelength. The contrast ratio between the vortex’s ring and core darkness is determined, and the polarization of the vortex s mapped. For the keywords, select up to 8 key terms for a search on your manuscript's subject.
When light travels through a spiral phase plate (SPP) device, it acquires structured wavefronts, i.e. a vortex containing orbital angular momentum. For an SPP device, which has a surface reflectivity, there will be multiple reflections in the device causing an azimuthal interference pattern. In this paper, the propagation of structured light is discussed after it has undergone multiple reflections in an SPP device under the thick-plate approximation.