以高频率分辨率探测亚波长厚度气室中的分子
Probing molecules in gas cells of subwavelength thickness with high frequency resolution
AI总结：
本研究在微米级亚波长薄气室中实现分子振转光谱探测，利用相干Dicke窄化效应获得亚多普勒分辨率，在近红外和中红外波段完成多分子共振探测，可应用于紧凑型频率基准等领域。
摘要：
为实现基础测量以及量子传感等技术应用，原子蒸气室的小型化与集成化研究已得到广泛开展。将这类平台拓展至分子物理领域是极具吸引力的研究方向，可为紧凑型频率计量以及探索复杂量子客体的光与物质相互作用铺平道路。本研究在厚度与激发波长相当的微米级薄气室中开展了分子振转光谱实验。我们在电磁波谱的两个不同区域运行该气室：在电信波长范围内探测1.530μm处乙炔的ν₁+ν₃共振，同时在10.55μm附近的中红外指纹区分别探测SF₆的ν₃共振和NH₃的ν₂共振。薄气室的限域效应可借助相干Dicke窄化效应实现线性亚多普勒透射光谱，本研究在分子振转体系中验证了这一效应。该实验可应用于紧凑型分子频率基准、大气物理或基础精密测量等领域。
英文摘要：
Miniaturizing and integrating atomic vapor cells is widely investigated for the purposes of fundamental measurements and technological applications such as quantum sensing. Extending such platforms to the realm of molecular physics is a fascinating prospect that paves the way for compact frequency metrology as well as for exploring light-matter interactions with complex quantum objects. Here, we perform molecular rovibrational spectroscopy in a thin-cell of micrometric thickness, comparable to excitation wavelengths. We operate the cell in two distinct regions of the electromagnetic spectrum, probing $ν_1$+$ν_3$ resonances of acetylene at 1.530$μ$m, within the telecommunications wavelength range, as well as the $ν_3$ and $ν_2$ resonances of $SF_6$ and $NH_3$ respectively, in the mid-infrared fingerprint region around 10.55$μ$m. Thin-cell confinement allows linear sub-Doppler transmission spectroscopy due to the coherent Dicke narrowing effect, here demonstrated for molecular rovibrations. Our experiment can find applications extending to the fields of compact molecular frequency references, atmospheric physics or fundamental precision measurements.
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