Hartmann Wladick, Varytis Paris, Gehring Helge, Walter Nicolai, Beutel Fabian, Busch Kurt, Pernice Wolfram
Institute of Physics, University of Münster, Wilhelm-Klemm-Strasse 10, 48149 Münster, Germany.
CeNTech-Center for Nanotechnology, University of Münster, Heisenbergstrasse 11, 48149 Münster, Germany.
Nano Lett. 2020 Apr 8;20(4):2625-2631. doi: 10.1021/acs.nanolett.0c00171. Epub 2020 Mar 16.
Harnessing tailored disorder for broadband light scattering enables high-resolution signal analysis in nanophotonic spectrometers with a small device footprint. Multiple scattering events in the disordered medium enhance the effective path length which leads to increased resolution. Here we demonstrate an on-chip random spectrometer cointegrated with superconducting single-photon detectors suitable for photon-scarce environments. We combine an efficient broadband fiber-to-chip coupling approach with a random scattering area and broadband transparent silicon nitride waveguides to operate the spectrometer in a diffusive regime. Superconducting nanowire single-photon detectors at each output waveguide are used to perform spectral-to-spatial mapping via the transmission matrix at the system, allowing us to reconstruct a given probe signal. We show operation over a wide spectral range with sensitivity down to powers of -111.5 dBm in the telecom band.
利用定制的无序结构实现宽带光散射，可在具有小器件尺寸的纳米光子光谱仪中进行高分辨率信号分析。无序介质中的多次散射事件增加了有效光程，从而提高了分辨率。在此，我们展示了一种与超导单光子探测器共集成的片上随机光谱仪，适用于光子稀缺的环境。我们将高效的宽带光纤到芯片耦合方法与随机散射区域和宽带透明氮化硅波导相结合，使光谱仪在扩散模式下运行。每个输出波导处的超导纳米线单光子探测器用于通过系统的传输矩阵进行光谱到空间的映射，从而使我们能够重建给定的探测信号。我们展示了该光谱仪在宽光谱范围内的运行情况，在电信频段灵敏度低至-111.5 dBm的功率水平。
