We propose a dual-mode optically pumped magnetometer (OPM) that can flexibly switch between single-beam modulation mode and double-beam DC mode. Based on 4 mm×4 mm miniaturized vapor cell, the achieves sensitivity of 7 fT/Hz1/2 with probe noise below working bandwidth over 65 Hz. This is designed to precisely measure floor mu-metal magnetic shield. The (sensitivity 20 fT/Hz1/2) exhibits charact...

Abstract Metasurface holograms are novel optical elements with enormous potential because of the charming electromagnetic features, which can manipulate amplitude, phase, polarization state, and other parameters light field via an elaborately designed subwavelength nanostructure array. Metagratings extensively researched for controlling feature in diffraction orders. However, a flexible simple ...