For what is believed to be the first time, a three-dimensional tungsten photonic crystal is demonstrated to emit light effectively at wavelength λ=1.5 μm . At a bias of <i>V</i>=7 V, the thermal emission exhibits a full width at half-maximum of Δλ=0.85 μm . Within this narrow band, the emitted optical power is 4.5 W and the electrical-to-optical conversion efficiency is ~22% per emitting surface. This unique emission is made possible by a large, absolute bandgap in the infrared λ and flat photonic dispersion near the band edges and in a narrow absorption band.
© 2003 Optical Society of America
S. Y. Lin, J. G. Fleming, and I. El-Kady, "Highly efficient light emission at λ = 1.5 μm by a three-dimensional tungsten photonic crystal," Opt. Lett. 28, 1683-1685 (2003)