A phase-change thin film-tuned photonic crystal device
A phase-change thin film-tuned photonic crystal device
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DOI：
10.1088/1361-6528/aaed8a
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发表时间：
2018-11
期刊：
影响因子：
3.5
通讯作者：
Longju Liu;Russell Mahmood;Le Wei;A. Hillier;Meng Lu
中科院分区：
文献类型：
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作者：
Longju Liu;Russell Mahmood;Le Wei;A. Hillier;Meng Lu
本文报道了一种可调谐光子器件，该器件在光子晶体 (PC) 结构中结合了一层薄层相变材料 Ge2Sb2Te5 (GST)。 PC 结构基于带有金属包层的一维光栅波导。金属包覆 PC 结构支持导模谐振 (GMR)，可选择性吸收特定波长的光。将GST材料插入选通波导中可以控制GMR模式。在这里，GST-PC 器件经过数值设计和优化，以获得 1550 nm 附近 GMR 模式的显着调谐。这种调谐现象通过 GST 薄膜的结晶相和非晶相之间的热诱导相变得到了实验证明。通过结晶过程实现了共振波长从 1440 nm 到 1610 nm 的光谱偏移。 GST 的相调谐表现出良好的可重复性，如通过在 GST 的非晶相和晶相之间切换多个周期所证明的。 GST-PC 器件代表了一种调整光学谐振的新方法，其潜在应用包括但不限于集成光子电路、光通信和高性能光学滤波器。
This paper reports a tunable photonic device that incorporates a thin layer of phase-change material, Ge2Sb2Te5 (GST), in a photonic crystal (PC) structure. The PC structure is based on a one-dimensional grating waveguide with a metal cladding. The metal-cladded PC structure supports a guided-mode resonance (GMR) that selectively absorbs light at a particular wavelength. Inserting the GST material into the gating waveguide makes it possible to control the GMR mode. Here, the GST-PC device was numerically designed and optimized to obtain significant tuning of the GMR mode around 1550 nm. The tuning phenomena were experimentally demonstrated by the heat-induced phase change between crystalline and amorphous phases of the GST thin film. A spectral shift of the resonant wavelength from 1440 to 1610 nm was achieved via the crystallization process. The phase tuning of GST exhibits good repeatability as demonstrated by switching between amorphous and crystalline phases of GST for multiple cycles. The GST-PC device represents a new approach for tuning optical resonances with potential applications including but not limited to integrated photonic circuits, optical communications, and high-performance optical filters.