We report some striking results on thermal radiation properties of a resonantly coupled cavity photonic crystal (PhC) at elevated temperatures (T = 400-900 K). We experimentally found that at resonant wavelengths, lambda = 1.1, 1.64, 2.85 mu m, the PhC emission is spectrally selective, quasi-coherent, directional, and shows significant deviation from Planck's blackbody law at equilibrium. The presence of non-equilibrium effects, driven by strong thermal excitation and cavity resonance, may be the major cause for our experimental observation.
- photonic bandgap materials; plasma interactions; thermal radiation; photonic crystal lasers and coherent effects
Hsieh, M-L., Lin, S. Y., James A. , B., & Rajeev, S. (2015). Experimental observation of anomalous thermal radiation from a three-dimensional metallic photonic crystal. Nanotechnology, 26(23), . https://doi.org/10.1088/0957-4484/26/23/234002