Focusing subwavelength grating coupler for mid-infrared suspended membrane germanium waveguides
Focusing subwavelength grating coupler for mid-infrared suspended membrane germanium waveguides
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DOI：
10.1364/ol.42.002094
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发表时间：
2017-06-01
期刊：
影响因子：
3.6
通讯作者：
Goda, Keisuke
中科院分区：
文献类型：
--
作者：
Kang, Jian;Cheng, Zhenzhou;Goda, Keisuke
我们提出了一种聚焦亚波长光栅（SWG）的中红外（中红外）光到悬浮膜锗光子集成电路（PIC），使中红外应用在整个指纹区域的有效耦合。凭借其宽的光谱透明窗口和空气包层设备配置，悬浮膜锗PIC预计将是有效的中红外应用的光谱区域覆盖从2到15 μ m。具体来说，我们证明了最大耦合效率为-11 dB的1 dB带宽类似于58 nm的SWG的中心波长为2.37 μ m。我们的聚焦SWG有望推动芯片上长波长中红外应用的发展，如指纹区域的生化传感，热成像和非线性光学。(C)2017美国光学学会
We present a focusing subwavelength grating (SWG) for efficient coupling of mid-infrared (mid-IR) light into suspended membrane Ge photonic integrated circuits (PICs) that enable mid-IR applications in the entire fingerprint region. By virtue of their wide spectral transparency window and air-cladding device configuration, the suspended membrane Ge PICs are expected to be effective for mid-IR applications over the spectral region covering from 2 to 15 mu m. Specifically, we demonstrate the maximum coupling efficiency of -11 dB with a 1-dB bandwidth of similar to 58 nm at the SWG's center wavelength of 2.37 mu m. Our focusing SWG is expected to advance the development of on-chip long-wavelength mid-IR applications such as biochemical sensing, thermal imaging, and nonlinear optics in the fingerprint region. (C) 2017 Optical Society of America