کد مقاله | کد نشریه | سال انتشار | مقاله انگلیسی | نسخه تمام متن |
---|---|---|---|---|
1591967 | 1515611 | 2014 | 6 صفحه PDF | دانلود رایگان |
• A thin steel plate with quasi-periodic array of holes is fabricated to serve as a lens.
• Subwavelength hotspots are observed in the post-evanescent field of the plate.
• Imaging of a point source with good resolution at different positions is exhibited.
A thin steel plate with quasi-periodic array of holes is fabricated, which is demonstrated to be able to function as an acoustic lens. With either a plane wave or a point source in object space, hotspots with the smallest size up to one-fifth wavelength are observed in the post-evanescent field regime in image space. Imaging of a point source with good resolution at different positions is also exhibited. The singular field distributions originate from the interference of the diffractive beams specific to quasi-periodic structures, which generates distinct and plentiful diffractive patterns.
Journal: Solid State Communications - Volume 185, May 2014, Pages 35–40