Optical rotation, a form of optical activity, is a phenomenon employed in various metrological applications and industries including chemical, food, and pharmaceutical. In naturally-occurring, as well as structured media, the integrated effect is, however, typically small. Here, we demonstrate that, by exploiting the inherent and stable spin-orbit interaction of orbital angular momentum fiber modes, giant, scalable optical activity can be obtained, and that we can use this effect to realize a new type of wavemeter by exploiting its optical rotary dispersion. The device we construct provides for an instantaneous wavelength-measurement technique with high resolving power R = 3.4 × 10⁶ (i.e., resolution < 0.3 pm at 1-μm wavelengths) and can also detect spectral bandwidths of known lineshapes with high sensitivity.

旋光是光学活动的一种形式，是一种应用于各种计量应用和行业（包括化学、食品和制药）的现象。然而，在自然存在的媒体和结构化媒体中，综合效应通常很小。在这里，我们证明，通过利用轨道角动量光纤模式固有且稳定的自旋轨道相互作用，可以获得巨大的、可扩展的光学活动，并且我们可以利用这种效应通过利用其光学特性来实现新型波长计。旋转分散。我们构建的设备提供了一种具有高分辨率R = 3.4 × 10 ⁶ （即，在 1 μm 波长下分辨率 < 0.3 pm）的瞬时波长测量技术，并且还可以高灵敏度检测已知线形的光谱带宽。