Ultraviolet–Visible Spin‐Resolved Chip‐Scale Spectroscopy

Abstract High‐resolution and lightweight broadband spectrometers with polarization‐resolving capabilities are crucial for advancing the agrochemical and pharmaceutical industries. Such cutting‐edge devices enable precise chemical analysis and process monitoring by transforming complex optical setups into compact, cost‐effective solutions. However, due to bulky and complex assemblies, achieving simultaneous spectral and polarization information remains challenging. To overcome this, this study develops and experimentally demonstrates a dual‐band, highly efficient circular polarization multiplexed multifocal metalens spectrometer, unlocking the spectral content and polarization information within the Ultraviolet–Visible (UV–Vis) is wavelength range (320–450 nm). Using bandgap‐engineered CMOS‐compatible silicon nitride, this design optimizes single‐element planar arrays to replicate the functionality of multiple optical components. It integrates wavelength, phase, and polarization multiplexing within a single, minimalistic structure. The Pancharatnam–Berry Phase (PB) phase element‐based geometric metasurface maps spectral data into focused spots, enabling circular polarization discrimination. Simulated and experimental results align closely, confirming the effectiveness of the approach. This design platform simplifies the optical information process and supports the generation of portable chiral spectrometers, a groundbreaking advancement for numerous real‐life applications like environmental sensing, healthcare, and many more.