The coupling of excited surface polaritons with thermal radiation through diffraction by gratings results in coherent thermal emission in a certain frequency range toward well-defined directions for p polarization. A planar coherent source is proposed that uses multilayers of negative permittivity (delta) and negative permeability (µ) materials. Owing to the excitation of surface polaritons at the interface between the negative-delta and negative-µ layers, coherent emission can be achieved for both s and p polarization. Moreover, one can control the emission frequency and direction by adjusting the layer thicknesses.
© 2005 Optical Society of America
C. J. Fu, Z. M. Zhang, and D. B. Tanner, "Planar heterogeneous structures for coherent emission of radiation," Opt. Lett. 30, 1873-1875 (2005)