[3A2] Studies on a novel hyperlens concept for ultrasonic non-destructive evaluation
P Kumar, M Subair, S Ali and P Rajagopal
Indian Institute of Technology Madras, India
Metamaterial concepts have attracted much research interest in recent years, yielding extraordinary
benefits such as super-resolution imaging, vibration damping, and cloaking. In the context of
imaging, Metalenses amplify the near-field and hence help overcome the resolution limit.
Hyperlenses enable subwavelength resolution along with spatial magnification by transforming
evanescent waves scattered past a material artifact into propagating waves at the far-field
‘imaging’ end of the medium. This paper discusses a novel radially symmetric ultrasonic hyperlens
for imaging defects in the context of non-destructive evaluation, a topic that has not been studied
much. The effect of parameters such as defect extent and distance between the lens on the
subwavelength imaging the hyperlens is studied using numerical simulations. The studies show
the magnification achievable using the proposed hyperlens and the effectiveness of this approach
for non-destructive evaluation using cost-effective ‘everyday’ transducers.
