Dispersion-engineered Phase Change Material Integrated Silicon Photonics Modulators with Controlled Insertion Losses

Active Photonic Platforms (APP) 2023（2023）

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Abstract

Photonic modulators have seen widespread use in optical circuitry, optical processing, and next-generational computing regimes such as neuromorphic computing. Prior research has focused on the incorporation of high-index functional materials on or adjacent to photonic circuit components such as modulators to enhance signal detection, modulation, and generation. The reversible, non-volatile transitions between optically and electrically unique amorphous and crystalline material phases inherent to chalcogenide phase-change materials (PCMs) present a promising material platform for this integration. However, current methods of incorporation combined with lossy material properties lead to integrations having large insertion losses and device footprints. Here we demonstrate that applying metamaterial effective medium theory enables dispersive engineering to drastically reduce insertion losses and footprints in PCM-loaded optical circuitry. Two configurations are explored, a metagrating and a multilayer, in which full-π modulator phase shifts are achieved in compact footprints down to 4.36 and 4.7 𝜇m with low insertion losses at a 1550nm wavelength.

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Key words

Phase Change Materials,Optical Modulators,Photonic Applications,Neuromorphic Photonics,Integrated Circuits

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Chat Paper

【要点】：本文提出了一种利用分散工程原理的硅光子学调制器设计，通过集成硫系相变材料（PCM）显著降低了插入损耗并减小了设备尺寸。

【方法】：作者采用 metamaterial 有效介质理论进行分散工程，以优化 PCM 负载的光学电路的插入损耗和尺寸。

【实验】：实验中探索了两种配置——光栅型和多层型，在1550nm波长下，实现了低插入损耗，且全π调制相移分别在4.36和4.7 𝜇m的紧凑尺寸。具体数据集名称未提及。