具有attometer分辨率的双梳延迟光谱
Dual-comb delay spectroscopy with attometer resolution
摘要：
光谱学在分子检测、生物分子鉴定和化学分析中提供精确的测量而引起了广泛的关注。然而，在混合分析物中，几乎无法区分具有重叠共振的不同来源。在这里，我们提出了双梳延迟光谱，以克服这个问题。群延迟谱的引入为识别强度或相位谱中可能导致重叠共振的源提供了一种新的工具。为了获得足够高的光谱分辨率和信噪比，以获得可靠的群延迟谱，探针梳的波长精确扫描的微波源的应用，导致阿米级的分辨率和百万级的信噪比。在实验中，光谱与可选的分辨率高达1 kHz（8 attometer），平均信噪比超过2，000，000，并超过33 nm的跨度被证明。来自两个不同来源的两个重叠共振被清楚区分。我们的工作为探索物质与光之间的相互作用提供了新的视角。
英文摘要：
Spectroscopy has attracted much attention in molecular detection, biomolecular identification, and chemical analysis for providing accurate measurement. However, it is almost unable to distinguish different sources with overlapped resonances in mixed analytes. Here, we present dual-comb delay spectroscopy to overcome this problem. The introduction of group delay spectroscopy provides a new tool to identify sources that would lead to overlapped resonances in intensity or phase spectroscopy. To obtain sufficiently high spectral resolution and signal-to-noise ratio for achieving reliable group delay spectrum, a probe comb with the wavelengths precisely scaned by a microwave source is applied, leading to attometer-level resolution and million-level signal-to-noise ratio. In an experiment, spectroscopy with an optional resolution up to 1 kHz (8 attometer), an average signal-to-noise ratio surpassing 2,000,000, and a span exceeding 33 nm is demonstrated. Two overlapped resonances from two different sources are clearly differentiated. Our work offers a new perspective for exploring the interaction between matter and light.
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