Manipulating continuous optical spectra in the wave vector domain by metalens

• DOI: 10.1364/ol.544925
• Publication Date: 2024-12-16T13:00:07Z
• Authors: Rui Liu; Wenhao Li; Wei Zhang; Jingying Zhang; Xinyu Wang
• Keywords: Reflection; Continuous wave

Complete 2π cycling of a phase around singularity leads to rapid variation in the nearby zones and forms sharp local k -vector peak. In this paper, intensity distribution spatial domain is transformed into wave vector domain, we prove that peak generated at point minimum light field intensity. The sharper when closer singularity. can be manipulated by controlling optical A metalens designed generate peaks for continuous wavelengths linearly shift positions these with incident wavelength. This method transforms full-band spectra from domain. spectral resolutions over wavelength range 800 nm 810 are less than 0.82 nm, optimal resolution reaches 0.027 nm. approach used metasurface spectroscopy, providing what believe new way improve resolution.