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Controlling the focusing properties of a triangular-lattice metallic photonic-crystal slab: 总被引:1,自引:0,他引:1
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This paper studies the focusing properties of a two-dimensional
photonic crystal (PC) slab consisting of a triangular lattice of
metallic cylinders immersed in a dielectric background. Through the
analysis of the equifrequency-surface contours and the field
patterns of a point source placed in the vicinity of the PC slab, it
finds that both the image distance and image quality can be
controlled by simply adjusting the refractive index of the
background material. 相似文献
63.
Near-field imaging of a square-lattice metallic photonic-crystal slab at the second band 总被引:1,自引:0,他引:1
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Imaging properties of a two-dimensional photonic crystal slab lens are
investigated through the finite-difference time-domain method. In this
paper, we consider the photonic crystal slab consisting of a square lattice
of square metallic rods immersed in a dielectric background. Through the
analysis of the equifrequency-surface contours and the field patterns of a
point source placed in the vicinity of the photonic crystal slab, we find
that a good-quality image can form at the frequencies in the second
TM-polarized photonic band. Comparing the images formed at different
frequencies, we can clearly see that an excellent-quality image is formed by
the mechanisms of simultaneous action of the self-collimation effect and the
negative-refraction effect. 相似文献
64.
Optical properties of the direct-coupled Y-branch filtersby using photonic crystal slabs 总被引:1,自引:0,他引:1
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We fabricated a new type of two-dimensional photonic crystal slab filter. The
resonant cavities were directly put into the waveguide arms. The optical
transmissions of the filters were measured and the results show that the optimized
two-channel filters give good intensity distribution at the output ports of the
waveguide. A minimum wavelength spacing of 5~nm of the filter outputs isrealized
by accurately controlling the size of the resonant cavities. 相似文献
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人类对半导体材料电性能的认识,催生了对电子运动的控制,将人类带入了计算机和信息社会.对合金和陶瓷的电气性能的研究,发现了高温超导现象.基于相同的目的,人类在材料光学性能的研究中,提出了相似的问题:材料的自发辐射是否可以控制?从而催生了光子晶体的概念.光子晶体是二种或二种以上介质的周期排列所构成的人造晶体.由于材料介电参量的周期调制,光子在其中的运动类似于电子在周期性势阱中的运动,因而可能存在光子带隙.当光子的频率在光子带隙内时,处于光子晶体内的原子、分子的辐射和相互作用特性都发生了根本的变化.这… 相似文献
68.
SiO2胶体颗粒的三维有序自组装 总被引:7,自引:0,他引:7
由SiO2胶体颗粒的三维有序自组装可以得到面心立方三维结构,它具有折射率周期性变化的特点。它的制备涉及胶体化学、材料科学等学科的前沿领域。其自组装方法包括胶体颗粒的沉降自组装、胶体颗粒在物体限制下的自组装、胶体颗粒的连续对流自组装和利用胶体颗粒表面电性质的自组装。本文对这些组装方法进行了介绍。 相似文献
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制备了乙醇 二氧化硅三维胶质光子晶体,其晶格常数随着晶体高度的变化而变化.用皮秒 脉冲激光在不同高度激发光子晶体中乙醇产生Raman信号,得到了两个结果:1)即使Raman 信号的中心频率与光子晶体的带隙中心频率一致,在其禁带方向上测得的强度也没有被抑制 到与带隙深度同样的量级;2)尽管单纯的具有Raman信号频率的入射光的透过率随着高度的 变化而剧烈变化,但在光子晶体中产生的Raman信号强度却几乎不随高度的变化而变化,即 光子晶体的赝带隙几乎没有影响在禁带方向上测得的Raman信号强度.基于“光子晶体
关键词:
光子晶体
Raman散射
赝带隙
内部光源 相似文献