Abstract
Herein we propose a design of a wavelength-tunable integrated vortex beam emitter based on the silicon-on-insulator platform. The emitter is implemented using a PN-depletion diode inside a microring resonator with the emitting hole grating that was used to produce a vortex beam. The resonance wavelengths can be shifted due to the refractive index change associated with the free plasma dispersion effect. Obtained numerical modeling results confirm the efficiency of the proposed approach, providing a resonance wavelength shift while maintaining the required topological charge of the emitted vortex beam. It is known that optical vortices got a lot of attention due to extensive telecommunication and biochemical applications, but also, they have revealed some beneficial use cases in sensors. Flexibility in spectral tuning demonstrated by the proposed device can significantly improve the accuracy of sensors based on fiber Bragg gratings. Moreover, we demonstrate that the proposed device can provide a displacement of the resonance by the value of the free spectral range of the ring resonator, which means the possibility to implement an ultra-fast orbital angular momentum (de)multiplexing or modulation.
Highlights
Since the unique properties of optical beams carrying orbital angular momentum (OAM), referred to as optical vortices, have been discovered in [1], the request for further research and development in this field has been growing steadily
Another major field for vortex beams is optical communications where OAM is usually considered as an additional degree of freedom for multiplexing
space division multiplexing (SDM) technology is based on the use of a degree of freedom determined by the transverse distribution of the electromagnetic (EM) field, that corresponds to multiplexing of spatially separated optical fields in multicore fibers (MCF) or using several linear polarized (LP) modes in few-mode fibers (FMF) [18]
Summary
Since the unique properties of optical beams carrying orbital angular momentum (OAM), referred to as optical vortices, have been discovered in [1], the request for further research and development in this field has been growing steadily This was not unreasonable, as applications of the vortex beams turned out to be interesting in a wide variety of areas. OAM, e.g., Bessel beams [6], along with other kinds of structured light [7] have found their application in such a remarkable topic as quantum communications [8], in higher-dimensional quantum key distribution [9], entanglement swapping [10], and multidimensional entanglement [11] Another major field for vortex beams is optical communications where OAM is usually considered as an additional degree of freedom for multiplexing. SDM concept can be applied in both fiber-optic [17,18,19,20] and atmospheric [21,22,23] optical communication lines
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