Phys.org June 9,2021
Optically detected magnetic resonance (ODMR) technology offers a readout approach to detect the spin state. Conventional ODMR detection of solid-state spin states are almost all under Strokes excitation, which requires that the excitation laser has higher energy than emitted photons. An international team of researchers (China, Hungary) investigated the dependence of laser power and temperature on AS excited ODMR signals, the researchers proved that the AS photoluminescence (PL) was induced by phonon-assisted single photon absorption process and was applicable to all-optical high-temperature temperature sensing. Based on this, they found that AS and Strokes excited ODMR followed similar behavior facing the change of laser power, microwave (MW) power and temperature, while the AS ODMR contrast remained approximately three times larger than the Strokes one. They realized coherent manipulation of solid-state spin states in SiC under AS excitation and results showed that the AS excitation method increased the signal contrast by around three times, enabling the potential applications of AS excited ODMR approach to quantum information processing and quantum sensing…read more. Open Access TECHNICAL ARTICLE
Anti-Stokes excitation scheme of VSi defects. Credit: Nature Communications volume 12, Article number: 3223 (2021)Â