物理学报Issue(5)：1-6,6.DOI:10.7498/aps.64.054301
基于周期结构负反射的远场增强成像研究∗
Research on far-field enhanced imaging based on negative reflection of p erio dic structure
摘要
Abstract
Far-field high resolution imaging is one of the research focus in the field of acoustics and optics in recent years. The greatest difficulty for high resolution imaging in the far field is the evanescent waves not being able to propagate in the medium. A kind of scatterers composed of uniformly spaced steel columns is presented in this work. Negative reflection of periodic structure can change the evanescent waves to the waves that can propagate to enhance imaging. A finite element simulation has been used to study and verify the feasibility of the scheme. Results show that with the sound wave of 3.4 mm wavelength one can obtain an imaging resolution of about 0.6 wavelength in the far field of 20 cm. We further note that by reducing the lattice constant of scatterers a higher far-field resolution imaging can be hopefully reached.关键词
负反射/远场/成像Key words
negative reflection/far field/imaging引用本文复制引用
杨丹青,王莉,王新龙..基于周期结构负反射的远场增强成像研究∗[J].物理学报,2015,(5):1-6,6.基金项目
国家自然科学基金(批准号:11174140)和国家重点基础研究发展计划(973计划)(批准号:2013CB632904)资助的课题.@@@@* Project supported by the National Natural Science Foundation of China (Grant No.11174140), and the National Basic Research Program of China (Grant No.2013CB632904) （批准号:11174140）
