The photonic energy band structure of a 3D, face-centred cubic package of silica balls (synthetic opal) was studied for both the positive refractive index (RI) contrast (RT/sub ball/RI/sub void/) situations. The inverted situation was obtained by impregnation of interstitial voids with a high-RI semiconductor. Following the inversion of the scattering ensemble, a dramatic change in the stop-bandwidth and angular dispersion of the stop-band were observed. The spontaneous emission from an incomplete photonic crystal is anisotropic to an extent which depends on the angular dispersion of the stop-band: it is suppressed in the middle of the stop-band and amplified at the stop-band edges. The amplified spontaneous emission (ASE) regime is the result of interplay between the photonic and electronic energy bandstructures of the photonic crystal. This effect is considered to be a precursor for stimulated emission.
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机译：研究了3D，面心立方石英球（合成蛋白石）的光子能带结构的正折射率（RI）对比度（RT / sub ball / RI / sub void /）情况。倒置情况是通过用高RI半导体浸渍间隙空隙而获得的。散射集合反转后，观察到阻带的带宽和角色散的急剧变化。来自不完整光子晶体的自发发射各向异性，其程度取决于阻带的角度色散：在阻带的中间被抑制，并在阻带边缘被放大。放大的自发发射（ASE）机制是光子晶体的光子和电子能带结构之间相互作用的结果。该效应被认为是受激发射的先兆。
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