Dynamic Modulation of Photonic Crystals by Surface Acoustic Waves

光子晶体的动态调制为光的主动控制提供了一种有效的机制。本项目旨在研究利用高频表面声波调制二维光子晶体。具体来说，SAW的声场和压电场将被用于调制近红外波长范围内光子晶体的结构尺寸和光学性质，从而控制光束的能量和传播方向。这些研究还包括弹性振动在结构介质中的传播研究，将使用高横向分辨率（小于1 μ m）和时间分辨率低于SAW振荡周期（0.5至10 ns）的光谱技术进行。通过这种方式，我们将能够局部探测到saw与光子带结构之间相互作用的动力学方面。这里介绍的新概念将为应用程序打开新的视角。saw对光子材料中光流的动态调制有望成为新型有源声光和电光光子器件的基础。

The dynamic modulation of photonic crystals provides an effective mechanism for the active control of light propagation. This project aims at the investigation of the modulation of twodimensional photonic crystals using high-frequency surface acoustic waves (SAWs). Specifically, the acoustic and piezoelectric fields of the SAW will be applied to modulate both the structural dimensions and the optical properties of photonic crystals for the near-infrared wavelength range, and thus to control the energy and propagation direction of light beams. The studies, that also include the investigation of the propagation of elastic vibration in structured media, will be performed using spectroscopic techniques with high lateral resolution (smaller than 1 µm) and with time resolution below the SAW oscillation period (0.5 to 10 ns). In this way, we will be able to locally probe the dynamic aspects of the interaction between SAWs and the photonic band structure. The new concepts introduced here will open new perspectives for applications. The dynamic modulation of light flow in photonic materials by SAWs is expected to form the basis for novel active acoustooptical and electrooptical photonic devices.