Generation of photonic orbital angular momentum superposition states using vortex beam emitters with superimposed gratings

Abstract

An integrated approach to produce photonic orbital angular momentum (OAM) superposition states with arbitrary OAM spectrum has been demonstrated. Superposition states between two vector OAM modes have been achieved by integrating a superimposed angular grating in one silicon micro-ring resonator, with each mode having near equal weight. The topological charge difference between the two compositional OAM modes is determined by the difference between the numbers of elements in the two original gratings being superimposed, while the absolute values of the topological charge can be changed synchronously by switching WGM resonant wavelengths. This novel approach provides a scalable and flexible source for the OAM-based quantum information and optical manipulation applications.

A coaxially integrated photonic orbital angular momentum beam multiplexer

“…To characterize the performance of the Ω-shaped OAM-beam emitter, a SLM-based OAM spectrum analysis system [10] is used to evaluate the SMSR as a function of wavelength. As shown in Fig.…”

Orbital angular momentum vector modes (de)multiplexer based on multimode micro-ring

“…An experimental setup based on a spatial light modulator (SLM), as shown in Fig. 5(a), was used to study the mode purities of the emitted OAM beams from the device [29]. After travelling through a quarter-wave plate and a polarizer, the RHCP or LHCP component of the beam was converted to a linearly polarized beam with an OAM value of…”

Generation and imaging of a tunable ultrafast intensity-rotating optical field with a cycle down to femtosecond region

“…The ultrafast intensity-rotating optical field (UIROF) has several interesting features. Its spatial structure rotates temporally and depends on the orbital angular momentum (OAM) [1][2][3] . Its angular velocity can be regulated by controlling the relative phase difference between two vortex beams.…”