Theoretical Investigation of Broadband Frequency Conversion Bridging the Mid-Infrared and Telecom Band Through a Chalcogenide/Sio2 Hybrid Waveguide
Theoretical Investigation of Broadband Frequency Conversion Bridging the Mid-Infrared and Telecom Band Through a Chalcogenide/Sio2 Hybrid Waveguide
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DOI：
10.1109/jphot.2021.3065946
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发表时间：
2021-04
影响因子：
2.4
通讯作者：
Yufei Huang;Di Xia;Bin Zhang;Pingyang Zeng;Zelin Yang;Huanjie Cheng;Mingjie Zhang;Ying Zhu;Zhaohui Li
中科院分区：
文献类型：
--
作者：
Yufei Huang;Di Xia;Bin Zhang;Pingyang Zeng;Zelin Yang;Huanjie Cheng;Mingjie Zhang;Ying Zhu;Zhaohui Li
在红外（IR）区域捕获分子的独特光谱指纹在气体检测中至关重要。然而，它仍然受到红外探测器的分辨率、灵敏度和信噪比的限制。在这里，从中红外波段（MIR）的宽带频率转换方案的基础上提出和理论研究的四波混频过程，结合在电信波段的成熟的探测器和独特的分子振动在MIR波段的优势。在非对称Ge-As-Se/SiO2混合波导中产生了平坦的低色散分布，具有四个零色散波长和低于20 ps/nm/km的色散变化。此外，利用高阶相位匹配，实现了1454-4521 nm的超宽3 dB连续波长转换带宽，这是目前芯片级器件中最宽的频率转换带宽。此外，提出了一种制造方案的色散的精确操纵。它在光子集成气体传感、生物医学诊断等方面具有很大的实际应用潜力。
Capturing the distinctive spectral fingerprints of molecules in the infrared (IR) region is of vital importance in gas detection. However, it is still limited by the resolution, sensitivity and signal to noise ratio of IR detectors. Here, a broadband frequency conversion scheme from the middle IR band (MIR) to the telecom band based on four-wave mixing process is proposed and theoretically investigated, combining the advantages of well-established detectors in the telecom band and unique molecular vibrations in the MIR band. A flat and low dispersion profile is generated in an asymmetric Ge-As-Se/SiO2 hybrid waveguide, which exhibits four zero-dispersion wavelengths and a dispersion variation of sub-20 ps/nm/km. Furthermore, taking advantage of the high order phase-matching, an ultra-broad 3-dB continuous wavelength conversion bandwidth covering 1454–4521 nm is achieved, which to the best of our knowledge is the widest frequency conversion bandwidth in the chip-scale devices. In addition, a fabrication scheme is proposed for the precise manipulation of dispersion. It holds great potential for practical applications in photonic integrated gas sensing, biomedical diagnostics.