Functionalized mm-scale vapor cells for alkali-metal spectroscopy and magnetometry

Abstract

We describe micro-fabricated rubidium vapor cells with integrated temperature-control functionality and demonstrate their suitability for use in miniaturized ultra-sensitive magnetometers. These functionalized vapor cells (FVCs) embody a dual-chamber design in low-conductivity silicon with anti-permeation coatings and micro-structured thin-film platinum surface traces as resistive heaters and temperature sensors. Thermal tests show our ability to control alkali metal distribution within the FVCs, ensuring a clean sensing chamber for optical measurements. Optical absorption spectroscopy is used to correlate the temperature readings with vapor density and to measure buffer gas pressure, of interest for optimizing sensitivity. Finally, we demonstrate zero-field resonance magnetometry with 18 fT/Hz${}^{1/2}$ sensitivity in the 10 Hz to 100 Hz band, limited by laser noise and magnetic shield noise, which indicates that the functionalization does not introduce significant magnetic noise.

Authors HR and MCDT contributed equally

References in corpus (5)

• A chip-scale atomic beam clock
• Micro-machined deep silicon atomic vapor cells
• Laser-written vapor cells for chip-scale atomic sensing and spectroscopy
• Real-time polarimetry of hyperpolarized ${}^{13}$C nuclear spins using an atomic magnetometer
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Cited by in corpus (1)

• Prospecting for lunar Helium-3 with a radio-frequency atomic magnetometer