Novel Interactions of Materials with Radiation Field in Photonic Cystals

我们首次成功地制备出晶格常数约为1微米的二维光子晶体，其H偏振具有共同的二维光子带隙。我们从实验上揭示了光子晶体独特的光学性质，包括不能与外平面波耦合的非耦合模的存在，0-3阶布喇格反射强度的反常激发波长相关光谱，以及放置在二维光子晶格中的少量分子的发射光谱，这些发射光谱也反映了当前光子态的密度。我们发现了二维光子晶体的新的无镜激光作用。通过对填充有染料溶液的空气孔的二维光子晶格样品的光学泵浦，我们观察到了两个特定波长的激光作用，即一个在自发辐射光谱的峰值附近，另一个在较长的波长。这些机制分别是由于非耦合本征模的高Q值和特定波长的慢群速度在界面处的少量反馈的帮助下产生了较长的有效相互作用长度。其次，在远红外模拟实验的基础上，我们发现由高介电常数组成的简单立方晶格应该具有完整的带隙，这对于开发这样的可见光波段的三维光子晶格是最有吸引力的。我们还发展了理论工作，得到了大量的结果。也就是说，我们在几个典型的二维和三维光子晶格中赋予了各自本征模的群论对称性，包括非耦合模的识别，建立了基于格林函数的光子晶体光学响应的一般理论，并发展了一种探索缺陷模的新方法。

We Succeeded for the first time in fabricating Such a 2D photonic crystal with the lattice constant on the order of 1mum as having a common 2D photonic band gap for H-polarization. We have revealed experimentally the unique optical properties Which include the existence of the uncoupled modes that can not couple to the external plane wave, anomalous excitation-wavelength-dependent spectra of 0-th-to-3rd order Bragg reflected intensities that are another manifestation of physical property of the respective photonic bands, and emission spectra from a small amount of molecules placed in a 2D photonic lattice that reflect also the density of the present photon states.We found new mirror-less laser actions characteristic of a 2D photonic crystal. By optically-pumping a 2D photonic-lattice specimen with the air-holes filled with a dye-solution, we observed the laser action at two specific wavelengths, i.e., one around the peak of the spontaneous emission spectrum and the other at a longer wavelength. The respective mechanisms are elucidated as being caused by a high Q-value of an uncoupled eigen-mode and a slow group velocity at a specific wavelength resulting in a long effective interaction length with the help of a small amount of feedback at the interfaces.Next, on the basis of a simulation experiment in the far-infrared region we have found that a simple cubic lattice made of a high dielectric constant should have a full band gap, which is most attractive for developing such a 3D photonic lattice at visible wavelengths.We have also developed theoretical woks with a lots of outcomes. Namely, we have assigned the respective eigen-modes the group theoretical symmetry in a few typical 2D and 3D photonic lattices, including identification of the uncoupled mode, constructed a general theory on the basis of Green function for optical response of the photonic crystal, and also developed a new method for exploring defect modes.