An optics-free computational spectrometer using a broadband and tunable dynamic detector
Abstract
Optical spectrometers are the central instruments for exploring the interaction between light and matter. The current pursuit of the field is to design a spectrometer without the need for wavelength multiplexing optics to effectively reduce the complexity and physical size of the hardware. Based on computational spectroscopic results and combining a broadband-responsive dynamic detector, we successfully demonstrate an optics-free single-detector spectrometer that maps the tunable quantum efficiency of a superconducting nanowire into an ill-conditioned matrix to build a solvable inverse mathematical equation. Such a spectrometer can realize a broadband spectral responsivity ranging from 660 to 1900 nm. The spectral resolution at the telecom is 6 nm, exceeding the energy resolving capacity of existing infrared single-photon detectors. Meanwhile, benefiting from the optics-free setup, precise time-of-flight measurements can be simultaneously achieved. We have demonstrated a spectral LiDAR with 8 spectral channels. This work provides a concise method for building multifunctional spectrometers and paves the way for applying superconducting nanowire detectors in spectroscopy.
Keywords
Cite
@article{arxiv.2011.02191,
title = {An optics-free computational spectrometer using a broadband and tunable dynamic detector},
author = {Ling-Dong Kong and Qing-Yuan Zhao and Hui Wang and Jia-Wei Guo and Hai-Yang-Bo Lu and Hao Hao and Shu-Ya Guo and Xue-Cou Tu and La-Bao Zhang and Xiao-Qing Jia and Lin Kang and Xing-Long Wu and Jian Chen and Pei-Heng Wu},
journal= {arXiv preprint arXiv:2011.02191},
year = {2023}
}