High resolution spectral metrology leveraging topologically enhanced optical activity in fibers.

ABSTRACT: 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

SUBMITTER: Greenberg AP 

PROVIDER: S-EPMC7568529 | biostudies-literature | 2020 Oct

REPOSITORIES: biostudies-literature