Micro/nanoscale thermal radiation in periodic gratings

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Radiative properties of micro/nanostructures can be very different from those of bulk materials [3,12], enabling spectral and directional control of thermal radiation for applications such as photonic and energy conversion systems such as solar cells and solar absorbers, thermophotovoltaic (TPV) devices, radiation filters, selective emitters, photodetectors, etc. Understanding and design of engineered surfaces with desired thermal radiative characteristics using controlled micro/nanostructures has emerged as a new frontier in heat transfer research. The transmission through the periodic sub-wavelength apertures can overcome the diffraction limit of an individual aperture and thus has drawn much attention with applications due to its potential in nanophotonics and nanolithography. In addition, grating structures have been commonly used in which coherent emission is achieved by the excitation of surface polaritons or surface waves. Along with the development of metamaterials, magnetic polaritons have also received much attention lately and have been demonstrated to be useful for controlling the radiative properties of periodic structures.