Image quality deterioration due to phase fluctuation in layered superlens

Image quality deterioration due to phase fluctuation in layered superlens
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分层超级透镜中的相位波动导致图像质量恶化

DOI:
10.1016/j.ijleo.2009.07.001
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发表时间:
2010-11
期刊:
影响因子:
3.1
通讯作者:
Mingkai Liu
Mingkai Liu
中科院分区:
物理与天体物理3区
文献类型:
--
作者:
Chongjun Jin;Mingkai Liu

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利用传输矩阵方法和有效介质模型,分析了金属(M)-介质(D)层状超透镜(MD)n(n为周期数)的光学传递函数(OTF)和像谱。结果表明,高截止波矢的光学传递函数(MTF)的大小并不能保证高分辨率,光学传递函数(PTF)的相位起伏也是引起超透镜成像畸变的主要因素。当多层金属-介质超透镜的周期数较少时,我们发现具有相同有效介电常数的不同类型的超透镜(如(MD)nM,(MD)n,(DM)nD)具有完全不同的性能,(DM)nD排列的超透镜具有最好的性能,这对于设计周期数较少的多层金属-介质超透镜具有重要的参考价值。
Optical transfer function (OTF) and image spectrums of the layered metal (M)–dielectric (D) superlenses (MD)n (where n is the number of cycles) are analyzed via transfer matrix method and effective-medium model. It is shown that the magnitude of OTF (MTF) with a high cutoff wave vector does not guarantee high resolution; the fluctuation of phase of OTF (PTF) is also a prime factor causing superlens imaging distortion. When the layered metal–dielectric superlenses have a small number of cycles, we find that the different types of superlenses (such as (MD)nM, (MD)n, and (DM)nD) with the same effective permittivity have totally different performances; the superlens with (DM)nD arrangement has the best performance; this will be valuable for designing layered metal–dielectric superlenses with less cycles.
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