Broadband on-chip single-photon spectrometer
Broadband on-chip single-photon spectrometer
复制标题
宽带片上单光子光谱仪
DOI：
10.1038/s41467-019-12149-x
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发表时间：
2019-09-10
影响因子：
16.6
通讯作者：
Tang, Hong X.
中科院分区：
文献类型：
--
作者：
Cheng, Risheng;Zou, Chang-Ling;Tang, Hong X.
单光子计数器是单像素二进制设备，其点击光子的吸收，但模糊其光谱信息，而分辨探测到的光子的颜色一直是前沿天文观测，光谱成像和波分复用量子通信的关键需求。单光子光谱仪的当前实现要么由庞大的波长扫描组件组成，要么具有有限的检测通道，从而阻止了具有高光谱分辨率的宽带单光子的并行检测。在这里，我们提出了第一个宽带芯片级单光子光谱仪，覆盖可见光和红外波段从600 nm到2000 nm。该光谱仪集成了一个片上色散中阶梯光栅和一个单元件超低速超导纳米线探测器，用于以高空间分辨率映射色散光子。演示的片上单光子光谱仪具有器件占用空间小、鲁棒性高、无移动部件的特点，同时提供200多个等效波长检测通道，具有更大的可扩展性。
Single-photon counters are single-pixel binary devices that click upon the absorption of a photon but obscure its spectral information, whereas resolving the color of detected photons has been in critical demand for frontier astronomical observation, spectroscopic imaging and wavelength division multiplexed quantum communications. Current implementations of single-photon spectrometers either consist of bulky wavelength-scanning components or have limited detection channels, preventing parallel detection of broadband single photons with high spectral resolutions. Here, we present the first broadband chip-scale single-photon spectrometer covering both visible and infrared wavebands spanning from 600 nm to 2000 nm. The spectrometer integrates an on-chip dispersive echelle grating with a single-element propagating superconducting nanowire detector of ultraslow-velocity for mapping the dispersed photons with high spatial resolutions. The demonstrated on-chip single-photon spectrometer features small device footprint, high robustness with no moving parts and meanwhile offers more than 200 equivalent wavelength detection channels with further scalability.