Far-field subwavelength imaging for ultrasonic elastic waves in a plate using an elastic hyperlens
作者： Hyung Jin Lee , Hoe Woong Kim , Yoon Young Kim
DOI: 10.1063/1.3600634
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摘要: Subwavelength imaging was experimentally performed for ultrasonic elastic waves by using an angularly stratified plat, plate hyperlens. It consists of alternating layers aluminum and air, exhibiting a large contrast in stiffness. A specially configured experimental setup is used to locate two sources within half the wavelength at 100 kHz. To explain observed phenomenon, homogenization elasticity coefficients structure employed. Because strong cylindrical anisotropy, equifrequency contour becomes nearly flat along angular wave vector so that evanescent involved with high resolution are converted propagating waves.
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