Chen Long, He Sailing, Shen Linfang
Centre for Optical and Electromagnetic Research, State Key Laboratory of Modern Optical Instrumentation, Joint Research Center of Photonics of the Royal Institute of Technology, Sweden.
Phys Rev Lett. 2004 Mar 12;92(10):107404. doi: 10.1103/PhysRevLett.92.107404.
The characteristics of an imaging system formed by a left-handed material (LHM) slab of finite length are studied, and the influence of the finite length of the slab on the image quality is analyzed. Unusual phenomena such as surface bright spots and negative energy stream at the image side are observed and explained as the cavity effects of surface plasmons excited by the evanescent components of the incident field. For a thin LHM slab, the cavity effects are found rather sensitive to the length of the slab; the bright spots on the bottom surface of the slab may stretch to the image plane and degrade the image quality.
研究了由有限长度的左手材料（LHM）平板构成的成像系统的特性，并分析了平板的有限长度对图像质量的影响。观察到诸如像侧表面亮点和负能量流等异常现象，并将其解释为入射场的倏逝分量激发的表面等离子体激元的腔效应。对于薄的LHM平板，发现腔效应相当敏感于平板的长度；平板底面的亮点可能延伸到像平面并降低图像质量。
