Ultra-compact acousto-optic modulation using on-chip integrated Bragg gratings on lithium niobate-chalcogenide hybrid platform

An ultra -compact and efficient acousto-optic modulator based on a thin-film lithium niobate-chalcogenide (ChG) hybrid platform was designed and realized. In this approach, pi phase -shift Bragg grating has an ultra -short effective interaction length of only similar to 300 mu m and a compact footprint of 200 x 300 mu m2. The strong microwave -acoustic coupling and superior photo -elastic property of the ChG allow us to achieve a half -wave voltage of V pi = 1.08 V (4.07 V) for the pi phase -shift Bragg grating (waveguide Bragg grating), corresponding to V pi L = 0.03 V<middle dot>cm (0.09 V<middle dot>cm). This acousto-optic modulator exhibits a compact size, and low power consumption, and can be used for on -chip optical interconnects and microwave photonics. (c) 2024 Optica Publishing Group under the terms of the Optica Open Access Publishing Agreement