Photonic and Optomechanical Thermometry

Temperature is one of the most relevant physical quantities that affects almost all processes in nature. However, realization accurate temperature standards using current references, like triple point water, difficult due to requirements on material purity and stability environment. In addition, harsh environments, sensors with electrical readout, platinum resistors, are implement, urging development optical sensors. 2018, European consortium Photoquant, consisting metrological institutes academic partners, started investigating new for self-calibrated, embedded optomechanical sensor applications, as well optimised high resolution reliability photonic sensors, measure at nano meso-scales a possible replacement standard resistant thermometers. This article presents an overview results obtained prototypes exploit techniques sensing temperatures over large range (5 K 300 K). Different concepts demonstrated, including ring resonators, ladder-like resonators suspended membrane thermometers, highlighting initial performance challenges, self-heating need be overcome realize thermometry applications.