Ondič L, Pelant I
Institute of Physics, Academy of Sciences of the Czech Republic, v.v.i., Cukrovarnicka 10, 162 53, Prague 6, Czech Republic.
Opt Express. 2012 Mar 26;20(7):7071-80. doi: 10.1364/OE.20.007071.
One of the possibilities of increasing optical gain of a light emitting source is by embedding it into a photonic crystal (PhC). If the properties of the PhC are tuned so that the emission wavelength of the light source with gain falls close to the photonic band edge of the PhC, then due to low group velocity of the light modes near the band edge caused by many multiple reflections of light on the photonic structure, the stimulated emission can be significantly enhanced. Here, we perform simulation of the photonic band edge effect on the light intensity of spectrally broad source interacting with a diamond PhC with low optical gain. We show that even for the case of low gain, up to 10-fold increase of light intensity output can be obtained for the two-dimensional PhC consisting of only 19 periodic layers of infinitely high diamond rods ordered into a square lattice. Moreover, considering the experimentally feasible structure composed of diamond rods of finite height - PhC slab - we show that the gain enhancement, even if reduced compared to the ideal case of infinite rods, still remains relatively high. For this particular structure, we show that up to 3.5-fold enhancement of light intensity can be achieved.
提高发光源光学增益的一种可能性是将其嵌入光子晶体（PhC）中。如果对光子晶体的特性进行调整，使得具有增益的光源的发射波长接近光子晶体的光子带边，那么由于光子结构上光的多次反射导致带边附近光模式的群速度较低，受激辐射可以得到显著增强。在此，我们对光子带边效应进行模拟，该效应作用于与具有低光学增益的金刚石光子晶体相互作用的光谱宽带光源的光强。我们表明，即使在低增益情况下，对于仅由19个无限高的金刚石棒周期层排列成正方形晶格组成的二维光子晶体，光强输出也能实现高达10倍的增加。此外，考虑由有限高度的金刚石棒组成的实验可行结构——光子晶体平板——我们表明，即使与无限棒的理想情况相比增益有所降低，但增益增强仍然相对较高。对于这种特定结构，我们表明光强可以实现高达3.5倍的增强。
