Comparison of directionally outcoupled photoluminescences from luminous layers on Si and Al nanocylinder arrays
Comparison of directionally outcoupled photoluminescences from luminous layers on Si and Al nanocylinder arrays
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DOI：
10.1063/1.5087204
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发表时间：
2019-04
影响因子：
3.2
通讯作者：
S. Murai;Motoharu Saito;Yuki Kawachiya;S. Ishii;Katsuhisa Tanaka
中科院分区：
文献类型：
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作者：
S. Murai;Motoharu Saito;Yuki Kawachiya;S. Ishii;Katsuhisa Tanaka
纳米柱阵列可以通过同时激发局部共振和光衍射来调制发射体的光致发光。对于局域共振，金属的局域表面等离子体激元(LSPP)已经得到了广泛的应用，而介质的Mie共振也可以作为候选。由于这两种共振是在不同种类的材料中激发的，所以很少对它们的增强效率进行实验比较。在这项研究中，我们制作了具有相同设计的硅和铝纳米柱面的周期性阵列，并比较了它们的发光输出耦合能力。我们在阵列上沉积了吸收紫外线(UV)的高亮度介质薄膜，并在紫外光激发下观察到了纳米柱面阵列上薄膜的增强发光。不同入射角的光学透过率表明，硅纳米柱面阵列中Mie共振的混合衍射模的色散比Al纳米柱面阵列中的衍射-LSPP混合模色散更尖锐。与Al纳米柱阵列相比，Si纳米柱阵列对发光的增强在光谱和空间上都具有更高的选择性，这可以归因于模式分布的不同。我们的研究结果从实验上验证了选择硅作为柱面阵列提供高方向性光源的优势，纳米柱面阵列可以通过同时激发局部共振和光衍射来调制发射体的光致发光。对于局域共振，金属的局域表面等离子体激元(LSPP)已经得到了广泛的应用，而介质的Mie共振也可以作为候选。由于这两种共振是在不同种类的材料中激发的，所以很少对它们的增强效率进行实验比较。在这项研究中，我们制作了具有相同设计的硅和铝纳米柱面的周期性阵列，并比较了它们的发光输出耦合能力。我们在阵列上沉积了吸收紫外线(UV)的高亮度介质薄膜，并在紫外光激发下观察到了纳米柱面阵列上薄膜的增强发光。不同入射角的光学透过率表明，硅纳米柱面阵列中Mie共振的混合衍射模的色散比衍射-LSPP的色散更尖锐。
An array of nanocylinders can modulate photoluminescence (PL) of emitters via simultaneous excitation of local resonances and light diffractions. Regarding the local resonance, localized surface plasmon polaritons (LSPP) of metals has been commonly applied, while the Mie resonance of dielectrics can also be a candidate. Since these two resonances are excited in different classes of materials, experimental comparisons between their enhancement efficiencies are rarely made. In this study, we fabricated periodic arrays of Si and Al nanocylinders with the identical design and compared their PL outcoupling abilities. We deposited ultraviolet (UV)-absorbing and highly luminous dielectric films on the arrays and observed enhanced PLs from the films on the nanocylinder arrays upon a UV laser excitation. The optical transmission with varied incident angles revealed that the dispersion of the hybrid mode of diffraction with the Mie resonance in the Si nanocylinder array was sharper than that of the diffraction-LSPP hybrid in the Al nanocylinder array. The PL enhancement by the Si nanocylinder array was more selective both spectrally and spatially than that by the Al nanocylinders, which could be attributed to the difference between the mode profiles. Our findings experimentally verified the advantage of choosing Si as a constituent of the cylinder array to provide highly directional light sources.An array of nanocylinders can modulate photoluminescence (PL) of emitters via simultaneous excitation of local resonances and light diffractions. Regarding the local resonance, localized surface plasmon polaritons (LSPP) of metals has been commonly applied, while the Mie resonance of dielectrics can also be a candidate. Since these two resonances are excited in different classes of materials, experimental comparisons between their enhancement efficiencies are rarely made. In this study, we fabricated periodic arrays of Si and Al nanocylinders with the identical design and compared their PL outcoupling abilities. We deposited ultraviolet (UV)-absorbing and highly luminous dielectric films on the arrays and observed enhanced PLs from the films on the nanocylinder arrays upon a UV laser excitation. The optical transmission with varied incident angles revealed that the dispersion of the hybrid mode of diffraction with the Mie resonance in the Si nanocylinder array was sharper than that of the diffraction-LSPP...