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Jin Xianmin’s Team Developed Vector Vortex Beam Emitter Photonic Chip

April 22, 2020      Author: Chen Yuan

On April 17, SJTU Professor Jin Xianmin’s research team cooperated with Professor Xia Keyu and Professor Lu Yanqing form Nanjing University and published their latest research findings titled “Vector Vortex Beam Emitter Embedded in a Photonic Chip” in the authoritative journal Physical Review Letters.

The corresponding authors are Professor Jin Xianmin, Professor Xia Keyu and Professor Lu Yanqing; the first author is Chen Yuan. This research team is grateful for the timely support from Shanghai Municipal Science and Technology Commission and The National Natural Science Foundation of China for key programs, and the help from National Key Research and Development Plan and Shanghai Municipal Education Commission.

ABSTRACT

Vector vortex beams simultaneously carrying spin and orbital angular momentum of light promise additional degrees of freedom for modern optics and emerging resources for both classical and quantum information technologies. The inherently infinite dimensions can be exploited to enhance data capacity for sustaining the unprecedented growth in big data and internet traffic and can be encoded to build quantum computing machines in high-dimensional Hilbert space. So far, much progress has been made in the emission of vector vortex beams from a chip surface into free space; however, the generation of vector vortex beams inside a photonic chip has not been realized yet. Here, we demonstrate the first vector vortex beam emitter embedded in a photonic chip by using femtosecond laser direct writing. We achieve a conversion of vector vortex beams with an efficiency up to 30% and scalar vortex beams with an efficiency up to 74% from Gaussian beams. We also present an expanded coupled-mode model for understanding the mode conversion and the influence of the imperfection in fabrication. The fashion of embedded generation makes vector vortex beams directly ready for further transmission, manipulation, and emission without any additional interconnection. Together with the ability to be integrated as an array, our results may enable vector vortex beams to become accessible inside a photonic chip for high-capacity communication and high-dimensional quantum information processing.

Link: https://journals.aps.org/prl/abstract/10.1103/PhysRevLett.124.153601

ABSTRACT

Twisted light carrying orbital angular momentum (OAM) provides an additional degree of freedom for modern optics and an emerging resource for both classical and quantum information technologies. Its inherently infinite dimensions can potentially be exploited by using mode multiplexing to enhance data capacity for sustaining the unprecedented growth in big data and internet traffic and can be encoded to build large-scale quantum computing machines in high-dimensional Hilbert space. While the emission of twisted light from the surface of integrated devices to free space has been widely investigated, the transmission and processing inside a photonic chip remain to be addressed. Here, we present the first laser-direct-written waveguide being capable of supporting OAM modes and experimentally demonstrate a faithful mapping of twisted light into and out of a photonic chip. The states OAM0, OAM−1, OAM+1, and their superpositions can transmit through the photonic chip with a total efficiency up to 60% with minimal crosstalk. In addition, we present the transmission of quantum twisted light states of single photons and measure the output states with single-photon imaging. Our results may add OAM as a new degree of freedom to be transmitted and manipulated in a photonic chip for high-capacity communication and high-dimensional quantum information processing.

Link: https://journals.aps.org/prl/abstract/10.1103/PhysRevLett.121.233602

 
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