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Near-field radiative heat transfer (NFHT) research currently suffers from animbalance between numerous theoretical studies, as opposed to experimentalreports that remain, in proportion, relatively scarce. Existing experimentalplatforms all rely on unique custom-built devices on which it is difficult tointegrate new materials and structures for studying the breadth oftheoretically proposed phenomena. Here we show high-resolution NFHTmeasurements using, as our sensing element, silicon nitride (SiN) freestandingnanomembranes$-$a widely available platform routinely used in materials andcavity optomechanics research. We measure NFHT by tracking the high mechanicalquality (Q) factor ($>2\times10^6$) resonance of a membrane placed in thenear-field of a hemispherical hot object. We find that high Q-factor enables atemperature resolution ($1.2\times10^{-6} \ \mathrm{K}$) that is unparalleledin previous NFHT experiments. Results are in good agreement with a custom-builtmodel combining heat transport in nanomembranes and the effect of non-uniformstress/temperature on the resonator eigenmodes.

High Resolution Measurement of Near-Field Radiative Heat Transfer enabled by Nanomechanical Resonators