Phys.org March 22, 2022
Taking advantage of the properties, especially the harmonic generation of nitrogen vacancy in diamond researchers Japan have presented an efficient and viable way for creating diamond-based nonlinear optical temperature sensing. Using infrared ultrashort pulse laser stimulation, the team found that the harmonic generation decreased with temperature over the range of 20–300°C. The temperature-dependent change was explained by mismatch due to the speed of different colors of light in the diamond. As the atomic lattice heats up, the difference in the index of refraction between the original light and the higher energy light created by harmonic generation grows larger, which decreases the efficiency of harmonic generation. According to the researchers, diamonds can be processed into a tiny tip for a probe as part of a nanometer-scale temperature sensor small enough to fit inside a living cell, which could be detected remotely with a laser…read more. TECHNICAL ARTICLEÂ
University of Tsukuba researchers used the nonlinear optical response of atom-like defects in a diamond to build a tiny thermometer. Credit: University of Tsukuba