Fig. 1
From: Thermal radiation from subwavelength objects and the violation of Planck’s law
Measuring the thermal emissivity of SiO2 nanoribbons. a Schematic illustration and scanning electron microscope (SEM) image of the suspended thermal transport measurement micro-device with a SiO2 nanoribbon where one can see the suspended heater and sensor electrodes (Pt) and a nanoribbon across the electrodes8. The scale bar in the SEM image represents 30 μm. b Schematic illustration of a long SiO2 nanoribbon with rectangular cross-section with thickness t and width W. Here, t is smaller than the skin depth δ and the thermal wavelength λTh, while W is comparable to the wavelength of the surface phonon polaritons λSPhP. c Measured emissivity at room temperature for 100 nm-thick ribbons with thickness of 6.28 and 11.5 μm. This emissivity is compared to the computed result for an infinitely wide thin film of the same thickness. Reprinted from ref. 8 with permission from Springer Nature
