期刊
NANO LETTERS
卷 20, 期 4, 页码 2625-2631出版社
AMER CHEMICAL SOC
DOI: 10.1021/acs.nanolett.0c00171
关键词
Silicon nitride; integrated optics; silicon photonics; tailored disorder; SNSPD; random spectrometer; broadband; visible; infrared
类别
资金
- Deutsche Forschungsgemeinschaft (DFG) [DFG-SPP 1839, Bu 1107/10-1, BU 1107/10-2, PE 1832/5-1, PE 1832/5-2]
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.
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