Waveguide‐Integrated Broadband Spectrometer Based on Tailored Disorder,Advanced Optical Materials

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Waveguide‐Integrated Broadband Spectrometer Based on Tailored Disorder
Advanced Optical Materials ( IF 8.0 ) Pub Date : 2020-01-22 , DOI: 10.1002/adom.201901602
Wladick Hartmann _{1,

2} , Paris Varytis ₃ , Helge Gehring _{1,

2} , Nicolai Walter _{1,

2} , Fabian Beutel _{1,

2} , Kurt Busch _{3,

4} , Wolfram Pernice _{1,

2}

Affiliation

Compact, on‐chip spectrometers exploiting tailored disorder for broadband light scattering enable high‐resolution signal analysis while maintaining a small device footprint. Due to multiple scattering events of light in the disordered medium, the effective path length of the device is significantly enhanced. Here, on‐chip spectrometers are realized for visible and near‐infrared wavelengths by combining an efficient broadband fiber‐to‐chip coupling approach with a scattering area in a broadband transparent silicon nitride waveguiding structure. Air holes etched into a structured silicon nitride slab terminated with multiple waveguides enable multipath light scattering in a diffusive regime. Spectral‐to‐spatial mapping is performed by determining the transmission matrix at the waveguide outputs, which is then used to reconstruct the probe signals. Direct comparison with theoretical analyses shows that such devices can be used for high‐resolution spectroscopy from the visible up to the telecom wavelength regime.

中文翻译：

基于量身定制的波导集成宽带光谱仪

利用量身定制的无序宽带光散射技术的紧凑型片上光谱仪可以在保持较小设备占用空间的同时，实现高分辨率信号分析。由于光在无序介质中的多次散射事件，设备的有效路径长度显着增加。在这里，通过将有效的宽带光纤到芯片耦合方法与宽带透明氮化硅波导结构中的散射区域相结合，可以实现可见光和近红外波长的片上光谱仪。蚀刻到结构化的氮化硅平板中的气孔可终止于多个波导，从而在漫射状态下实现多路径光散射。频谱到空间的映射是通过确定波导输出处的传输矩阵来执行的，然后将其用于重建探测信号。

更新日期：2020-03-20

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