硅光子平台中声子的模式选择性声电调制

中文摘要 AI 辅助

声电（AE）相互作用通过压电介质实现对声传播的电控制。将声电控制引入集成光子平台，提供了一种强大的片上控制机制，可通过电调谐声子传播来重构声延迟线响应和有效光子-声子相互作用。本文报道了在可扩展的氮化铝-绝缘体上硅（AlN-on-SOI）平台上的模式选择性声电调制效应。观察到施加的直流电场通过载流子浓度的变化以模式选择性的方式调制声子耗散，在声延迟线内对非基模产生高达20 dB的前向传输抑制，同时保持基模瑞利模式，这一现象是传统声电处理所无法捕捉的。为了探测这些动力学过程，我们沿声延迟线集成了光波导，提供了声域与光域之间的宽带、非破坏性接口。利用这一光学接口和潜在的模态选择性，我们在此混合平台上演示了概念验证的多域换能和瑞利模式滤波，为电可重构模式工程和微波光子功能铺平了可扩展的道路。

英文摘要

Acousto-electric (AE) interactions enable electrical control of acoustic propagation through piezoelectric media. Bringing AE control onto integrated photonic platforms provides a powerful on-chip control mechanism to reconfigure both the acoustic propagation through piezoelectric media. Bringing AE control onto integrated photonic platforms provides a powerful on-chip control mechanism to reconfigure both the acoustic delay line response and the effective photon-phonon interaction by electrically tuning the phonon propagation. Here we report a mode-selective AE modulation effect in a scalable aluminum nitride on silicon-on-insulator (AlN-on-SOI) platform. An applied DC field is seen to modulate the phonon dissipation via changes in carrier concentration in a mode-selective fashion, producing up to 20 dB forward transmission suppression of non-fundamental modes within an acoustic delay line while maintaining the fundamental Rayleigh mode, a phenomenon not captured by conventional AE treatments. To probe these dynamics, we integrate an optical waveguide along the acoustic delay line, providing a broadband, non-destructive interface between the acoustic and optical domains. Leveraging both this optical interface and the underlying mode selectivity, we demonstrate proof-of-concept multi-domain transduction and Rayleigh-mode filtering on this hybrid platform, outlining a scalable path toward electrically reconfigurable mode engineering and microwave-photonic functionality.

发表机构

• Yale University（耶鲁大学）
• Sandia National Laboratories（桑迪亚国家实验室）
• Northern Arizona University（北亚利桑那大学）
• University of Arizona（亚利桑那大学）

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