Fig. 1: Concept of the dispersive meta-lens thermometry.
From: Dispersive Meta-lens Thermometry for High-temperature Measurements

Schematic of the DMT system, in which a dispersive meta-lens encodes broadband thermal radiation from a heat source into a spatially varying dispersion image. A single snapshot captured by a CMOS sensor is computationally decoded into hyperspectral data, enabling the temperature field reconstruction.