A silicon microring resonator with an embedded Bragg grating for orbital angular momentum (OAM) generation is designed and experimentally demonstrated. The device consists of a 3.9 μm-radius ring resonator with cylindrical silica holes along the central path and exploits the radially polarized component of the propagating electric field in the resonator's strip waveguide, enabling both the bandwidth broadening and the emission efficiency improvement, while reducing the footprint. The experimental results show that the device achieves a 3dB bandwidth of 134 GHz and an efficiency up to 6.5%. The interference patterns are measured for different OAM orders in which the number of spirals are clearly visible proving that the device can support different topological charges. Results are in good agreement with simulations.
Orbital Angular Momentum Generation with Ultra-Compact Bragg-Assisted Silicon Microrings
GAMBINI, Fabrizio;VELHA, PHILIPPE;OTON NIETO, CLAUDIO JOSE;FARALLI, STEFANO
2016-01-01
Abstract
A silicon microring resonator with an embedded Bragg grating for orbital angular momentum (OAM) generation is designed and experimentally demonstrated. The device consists of a 3.9 μm-radius ring resonator with cylindrical silica holes along the central path and exploits the radially polarized component of the propagating electric field in the resonator's strip waveguide, enabling both the bandwidth broadening and the emission efficiency improvement, while reducing the footprint. The experimental results show that the device achieves a 3dB bandwidth of 134 GHz and an efficiency up to 6.5%. The interference patterns are measured for different OAM orders in which the number of spirals are clearly visible proving that the device can support different topological charges. Results are in good agreement with simulations.I documenti in IRIS sono protetti da copyright e tutti i diritti sono riservati, salvo diversa indicazione.
