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Resistance thermometry provides a time-tested method for taking temperaturemeasurements that has been painstakingly developed over the last century.However, fundamental limits to resistance-based approaches along with a desireto reduce the cost of sensor ownership and increase sensor stability hasproduced considerable interest in developing photonic temperature sensors. Herewe demonstrate that silicon photonic crystal cavity-based thermometers canmeasure temperature with uncertainities of 175 mK (k = 1), where uncertaintiesare dominated by ageing effects originating from the hysteresis in the devicepackaging materials. Our results, a 4-fold improvement over recentdevelopments, clearly demonstate the rapid progress of silicon photonic sensorsin replacing legacy devices.

Towards Replacing Resistance Thermometry with Photonic Thermometry