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Nonvolatile Reconfigurable and Narrowband Mid-Infrared Filter Based on Surface Lattice Resonance in Phase-Change Ge

机译：基于相变电气的表面晶格共振的非易失性可重构和窄带中红外滤波器

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摘要

We propose a nonvolatile, reconfigurable, and narrowband mid-infrared bandpass filter based on surface lattice resonance in phase-change material Ge2Sb2Te5. The proposed filter is composed of a two-dimensional gold nanorod array embedded in a thick Ge2Sb2Te5 film. Results show that when Ge2Sb2Te5 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 quality 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 quality 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 quality factors. We expect that this work will advance the engineering of Ge2Sb2Te5-based nonvalatile tunable surface lattice resonances and will promote their applications especially in reconfigurable narrowband filters.
机译：我们提出了一种基于相变材料Ge2sb2te5中的表面晶格共振的非易失性，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GE2SB2Te5膜中的二维金纳米棒阵列组成。结果表明，当GE2SB2TE5从非晶态转移到晶体状态时，所提出的滤波器的窄带反射谱从3.197μm调谐到4.795μm，覆盖着中红外线的大部分，峰值反射率从72.6％降低25.8％，相应的质量因数从19.6降至10.3。我们表明可以通过改变入射角或格子时段来调节光谱调谐范围。通过适当地设计金纳罗码尺寸，我们还表明，在相对较小的峰值反射效率下，质量因数可以大大增加到70，并且峰值反射效率可以进一步增加到80％，以相对较小的成本质量因素。我们预计这项工作将推进基于GE2SB2TE5的非alatile可调表面晶格共振的工程，并将促进其应用，尤其是可重构的窄带过滤器。

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