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首页> 外文期刊>Physica, B. Condensed Matter >Improving unrestricted imaging quality of a triangular lattice photonic crystal slab by modifying surface configuration
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Improving unrestricted imaging quality of a triangular lattice photonic crystal slab by modifying surface configuration

机译：通过修改表面配置来提高三角晶格光子晶体平板的不受限制的成像质量

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摘要

We propose a photonic crystal (PC) structure only by replacing square lattice [Luo et al. (2002) [12]] with triangular lattice to obtain an unrestricted imaging. Equal-frequency contours (EFCs) analysis shows that this triangular lattice two-dimensional PC exhibits an effective isotropic refractive index n_(eff)=-1 at a normalized frequency ω=0.291×2πc/ a. Imaging quality of this triangular lattice PC slab involving both power intensity and full-width at half-maximum intensity of the image is studied using the finite-difference time-domain (FDTD) simulation. In order to achieve a high-quality image, an appropriate surface termination is chosen. In addition, by adjusting the surface air-hole radius of the PC slab, the imaging quality can be further improved. Coupled-mode theory analysis shows that the optimized surface termination and the adjusted surface air-hole can excite two kinds of surface modes that can couple with the Bloch wave in the PC. With the help of these surface modes, both the intensity of image and the super-resolution capacity of this triangular lattice PC slab can be improved greatly.
机译：我们提出光子晶体（PC）结构仅通过替换方格[Luo等。 （2002）[12]]使用三角晶格获得不受限制的成像。等频轮廓线（EFCs）分析表明，该三角晶格二维PC在归一化频率ω= 0.291×2πc/ a时具有有效的各向同性折射率n_（eff）=-1。使用有限差分时域（FDTD）仿真研究了该三角形晶格PC平板的成像质量，该图像同时包含功率强度和半高全宽图像。为了获得高质量的图像，选择适当的表面终止。另外，通过调节PC平板的表面气孔半径，可以进一步提高成像质量。耦合模式理论分析表明，优化的表面端接和调整的表面气孔可以激发两种表面模式，这些模式可以与PC中的Bloch波耦合。借助这些表面模式，可以大大提高此三角形晶格PC平板的图像强度和超分辨率能力。

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