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The investigation of pulsars between millimetre and optical wavelengths ischallenging due to the faintness of the pulsar signals and the relative lowsensitivity of the available facilities compared to 100-m class telescopesoperating in the centimetre band. The Kinetic Inductance Detector (KID)technology offers large instantaneous bandwidths and a high sensitivity thatcan help to substantially increase the ability of existing observatories atshort wavelengths to detect pulsars and transient emission. To investigate thefeasibility of detecting pulsars with KIDs, we observed the anomalous X-raypulsar XTE J1810-197 with the New IRAM KIDs Array-2 (NIKA2) camera installed atthe IRAM 30-m Telescope in Spain. We detected the pulsations from the pulsarwith NIKA2 at its two operating frequency bands, 150 and 260 GHz ($\lambda$=2.0and 1.15 mm, respectively). This is the first time that a pulsar is detectedwith a receiver based on KID technology in the millimetre band. In addition,this is the first report of short millimetre emission from XTE J1810-197 afterits reactivation in December 2018, and it is the first time that the source isdetected at 260 GHz, which gives us new insights into the radio emissionprocess of the star.

Detection of the magnetar XTE J1810-197 at 150 and 260 GHz with the NIKA2 Kinetic Inductance Detector camera