Open AccessResearch on far-field enhanced imaging based on negative reflection of periodic structure
Author(s) -
Danqing Yang,
Wang Li,
Xinlong Wang
Publication year - 2015
Publication title -
wuli xuebao
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.199
H-Index - 47
ISSN - 1000-3290
DOI - 10.7498/aps.64.054301
Subject(s) - optics , wavelength , near and far field , physics , reflection (computer programming) , resolution (logic) , focus (optics) , field (mathematics) , acoustics , computer science , mathematics , pure mathematics , programming language , artificial intelligence
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.