Infrared Emission for Heat Radiation From Micro-Cone Textured Metallic Sheet Device With Semi-Regular Alignment

A micro-cone textured copper sheet was fabricated as an emitter of electromagnetic waves in the near-infrared (IR) to the far-IR wavelengths. The micro-cone texture was aligned in semiregular by varying the micro-cone size parameters. The micro-cone height (H) was varied from 0.5 μm to 4 μm in average. Scanning electron microscopy (SEM) analysis was utilized to characterize the microstructure of micro-cone textures and to measure the population of micro-cone height (H), its root diameter (B), and pitch (D) with aid of the image processing and computational geometry. This emittance was measured by Fourier transformation-infrared (FT-IR) to investigate the micro-cone size effect on the resonant wavelengths for IR-emission. This height population P(H) was compared to the IR emission spectrum, which was measured by the FT-IR. Even varying the average height of micro-cone textures, the IR-emission wavelength (λ) abided by the resonance condition by λ ∼ 2 × H within the standard deviation of heights and wavelengths. The radiation heat flux from this emitter to objective body in vacuum was experimentally estimated to describe the heat transportation from this microtextured emitter. Through the heat radiation experiment in vacuum, the emitted heat flux was estimated to be 58 W/m² by the one-dimensional heat balance between the heating rate of objective body and the radiated heat flux.