I show that under proper conditions, thin-film structures behave as thermal sources that are able to emit radiation in well-defined directions over a broad spectral band for both <i>p</i>- and <i>s</i>-polarization states of light. This effect results from the quantization of modes inside the structure as in a Fabry–Perot resonator. A theoretical demonstration of this effect is given by using the matrix transfer method. This result is similar to the most efficient reported results with gratings but with use of a completely different physical principle [Nature <b>416</b>, 61 (2002)].
© 2004 Optical Society of America
Philippe Ben-Abdallah, "Thermal antenna behavior for thin-film structures," J. Opt. Soc. Am. A 21, 1368-1371 (2004)