Kramper P, Agio M, Soukoulis C M, Birner A, Müller F, Wehrspohn R B, Gösele U, Sandoghdar V
University of Konstanz.
Phys Rev Lett. 2004 Mar 19;92(11):113903. doi: 10.1103/PhysRevLett.92.113903. Epub 2004 Mar 18.
Recently it has been shown that it is possible to achieve directional emission out of a subwavelength aperture in a periodically corrugated metallic thin film. We report on theoretical and experimental studies of a related phenomenon concerning light emitted from photonic crystal waveguides that are less than a wavelength wide. We find that the termination of the photonic crystal end facets and an appropriate choice of the wavelength are instrumental in achieving very low numerical apertures. Our results hold promise for the combination of photonic crystal waveguides with conventional optical systems such as fibers, waveguides, and freely propagating light beams.
最近的研究表明，在周期性波纹金属薄膜中的亚波长孔径能够实现定向发射。我们报告了一项关于从宽度小于一个波长的光子晶体波导发出的光的相关现象的理论和实验研究。我们发现，光子晶体端面的终止以及波长的适当选择有助于实现非常低的数值孔径。我们的研究结果为光子晶体波导与传统光学系统（如光纤、波导和自由传播光束）的结合带来了希望。
