Direct laser writing of birefringent photonic crystals for the infrared spectral range
Direct laser writing of birefringent photonic crystals for the infrared spectral range
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DOI：
10.1116/1.5122991
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发表时间：
2019-11-01
影响因子：
1.4
通讯作者：
Hofmann, Tino
中科院分区：
文献类型：
--
作者：
Lata, Marc;Li, Yanzeng;Hofmann, Tino
基于双光子聚合的红外光学光子晶体的制备方法是激光直写法，自该方法出现以来，受到了广泛的关注。双光子聚合可以是制造红外光谱范围内的全介电光子晶体的破坏性技术，因为它允许合成具有任意几何形状和排列的均匀结构的大规模阵列。然而，在红外光谱范围内提供双折射光学响应的全介质光子晶体尚未使用直接激光写入技术进行证明。在这里，作者探讨了双折射观察到的亚波长尺寸的倾斜聚合物微丝阵列的光子晶体。这里研究的光子晶体是使用红外透明光致抗蚀剂（IP-Dip）的直接激光写入在单个制造步骤中制造的。一个强烈的对比度的交叉偏振反射率的光子晶体作为一个功能的面内取向的观察在中红外光谱范围在λ接近6.5 μ m。该观察结果指示各向异性光学行为。基于有限元的技术证实了实验观察到的反应定性。
Infrared optical photonic crystals fabricated using direct laser writing, which is based on the two-photon polymerization of suitable monomers, have received substantial interest since the emergence of this process. Two-photon polymerization could be a disruptive technology for the fabrication of all-dielectric photonic crystals in the infrared spectral range, as it allows the synthesis of large scale arrays of uniform structures with arbitrary geometries and arrangements. However, all-dielectric photonic crystals that provide birefringent optical responses in the infrared spectral range have not yet been demonstrated using direct laser writing techniques. Here, the authors explore the form bire-fringence observed in photonic crystals composed of arrays of subwavelength-sized slanted polymer microwires. The photonic crystals investigated here were fabricated in a single fabrication step using direct laser writing of an infrared transparent photoresist (IP-Dip). A strong contrast of the cross-polarized reflectance of photonic crystals as a function of the in-plane orientation is observed in the mid-infrared spectral range at lambda approximate to 6.5 mu m. This observation is indicative of an anisotropic optical behavior. Finite element based techniques corroborate the experimentally observed responses qualitatively.