Two-pair multilayer Bloch surface wave platform in the near- and mid-infrared regions
Two-pair multilayer Bloch surface wave platform in the near- and mid-infrared regions
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DOI：
10.1063/1.5101008
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发表时间：
2019-08-26
影响因子：
4
通讯作者：
Delaunay, Jean-Jacques
中科院分区：
文献类型：
--
作者：
Deng, Chih-Zong;Ho, Ya-Lun;Delaunay, Jean-Jacques
布洛赫表面波(BSW)平台为光子电路传感器和元件的设计开辟了新的可能性，因为它具有传播损耗低等优越特性，可以实现长光通信长度和较大的表面传感面积。然而，已报道的BSW平台大多需要大量的交替层来实现面波模式的耦合。此外，尽管在可见光和近红外(NIR)区域已经研究了BSW模式，但在重要的中红外(MIR)区域只有有限的报道可用。在这项研究中，我们展示了一种只由两个Ge/SiO_2对组成的BSW平台，实现了从近红外到MIR的宽光谱范围内的良好耦合的BSW。利用Ge和SiO_2之间的巨大折射率差异，所提出的BSW多层结构被设计为仅具有两对层，并且总厚度小于任何已报道的BSW平台。已报道的MIR BSW模式显示了确定附着在所提议的BSW结构表面的痕量元素和分子物种的潜力。由AIP出版公司授权出版。
A Bloch surface wave (BSW) platform opens up new possibilities in the design of sensors and components for photonic circuits owing to its superior properties such as low propagation losses that enable long optical communication lengths and large surface sensing areas. However, most of the reported BSW platforms require a large number of alternating layers to realize the coupling of the surface wave mode. Additionally, although BSW modes have been investigated in the visible region and the near-infrared (NIR) region, only limited reports are available in the important mid-infrared (MIR) region. In this study, we demonstrated a BSW platform consisting of only two Ge/SiO2 pairs and realizing well-coupled BSW in a wide spectral range from the NIR to the MIR. Exploiting the large refractive index difference between Ge and SiO2, the proposed BSW multilayer structure is designed to possess only two pairs of layers with a smaller total thickness than any of the reported BSW platforms. The reported MIR BSW mode shows potential for determination of trace elements and molecule species attached on the surface of the proposed BSW structure. Published under license by AIP Publishing.