A three-dimensional, metallic photonic crystal is realized and its absorption measured at infrared wavelengths. The metallic absorption rate is found to be suppressed in the photonic bandgap regime (λ∼8–20 μm). On the other hand, order-of-magnitude absorption enhancement is observed at the photonic band edge (λ∼5.8 μm). The enhancement is attributed to the slower group velocity of light at the photonic band edge, a longer photon–matter interaction length, and a finite intrinsic absorption of tungsten.
© 2003 Optical Society of America
S. Y. Lin, J. G. Fleming, Z. Y. Li, I. El-Kady, R. Biswas, and K. M. Ho, "Origin of absorption enhancement in a tungsten, three-dimensional photonic crystal," J. Opt. Soc. Am. B 20, 1538-1541 (2003)