论文标题
基于相变的gesbte中的表面晶格共振，非易失性，可重构和窄带中红外过滤器
Nonvolatile, reconfigurable and narrowband mid-infrared filter based on surface lattice resonance in phase-change GeSbTe
论文作者
论文摘要
我们基于相变材料GE2SB2TE5（GST）中的表面晶格共振，提出了一种非易失性，可重构和窄带中红外带通滤波器。所提出的过滤器由嵌入厚的GST膜中的二维金纳米棒阵列组成。结果表明，当GST从无定形状态转变为晶状状态时，提出的过滤器的窄带反射频谱从3.197μm调至4.795μm，涵盖了大多数中膜状态，峰值反射率从72.6％到25.8％，以及相应的Q型降低，从199.6降低了19.6。我们表明，可以通过改变入射角或晶格周期来调整光谱调整范围。通过正确设计金纳米棒尺寸，我们还表明，以相对较小的峰值反射效率，Q因子可以大大增加到70个，并且峰反射效率可以以相对较小的Q-factors的成本进一步提高到80％。我们预计这项工作将推动基于GST的非valapile可调表面晶格共振的工程，并将促进其应用程序，尤其是在可重新配置的窄带过滤器中。
We propose a nonvolatile, reconfigurable, and narrowband mid-infrared bandpass filter based on surface lattice resonance in phase-change material Ge2Sb2Te5 (GST). The proposed filter is composed of a two-dimensional gold nanorod array embedded in a thick GST film. Results show that when GST transits from the amorphous state to the crystalline state, the narrowband reflection spectrum of the proposed filter is tuned from 3.197 μm to 4.795 μm, covering the majority of the mid-infrared regime, the peak reflectance decreases from 72.6% to 25.8%, and the corresponding Q-factor decreases from 19.6 to 10.3. We show that the spectral tuning range can be adjusted by varying the incidence angle or the lattice period. By properly designing the gold nanorod sizes, we also show that the Q-factor can be greatly increased to 70 at the cost of relatively smaller peak reflection efficiencies, and that the peak reflection efficiency can be further increased to 80% at the cost of relatively smaller Q-factors. We expect this work will advance the engineering of GST-based nonvalatile tunable surface lattice resonances and will promote their applications especially in reconfigurable narrowband filters.
