Nanoscale optical high-temperature sensor

All-dielectric nanoparticle possesses strong inherent Raman response due to allowed optical phonon modes. We show that such (crystalline silicon) nanoparticle with a magnetic quadrupolar Mie resonance converts light to heat with simultaneous Raman thermometry up to 900 K. The advantage of using crystalline silicon is the simplicity of local temperature control by means of Raman spectroscopy working in a broad range of temperatures, that is, up to the melting point of silicon (1690 K) with submicrometer spatial resolution. Our platform paves the way to novel nonplasmonic applications, extending the temperature range and simplifying the thermoimaging procedure.