Transactions of the Indian Institute of Metals

, Volume 72, Issue 11, pp 2917–2921 | Cite as

Characterization of Deep Sub-wavelength Sized Horizontal Cracks Using Holey-Structured Metamaterials

  • Mohamed Subair Syed Akbar AliEmail author
  • Kiran Kumar Amireddy
  • Krishnan Balasubramaniam
  • Prabhu Rajagopal
Technical Paper


Image resolution in classical wave applications is limited by the diffraction limit which corresponds to half the operating wavelength (λ). To achieve higher resolution, ways of overcoming the natural diffraction limits are of interest. In this paper, an experimental demonstration of deep sub-wavelength resolution in the ultrasonic regime using a metamaterial lens is presented. Metamaterial lenses effectively transfer the evanescent waves to the imaging plane, which carry the details of the sub-wavelength features. The successful transmission of the decaying evanescent waves which contain much larger wave vectors than the propagating waves enables to overcome the diffraction limit set by the operating wavelength. We report an imaging technique using optimized holey-structured metamaterial lens to characterize a horizontal crack of size λ/25 in a layered aluminium sample.


Diffraction limit Deep sub-wavelength resolution Evanescent waves Holey-structured metamaterial lens Horizontal crack 



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Copyright information

© The Indian Institute of Metals - IIM 2019

Authors and Affiliations

  1. 1.Department of Mechanical Engineering, Centre for Non-destructive EvaluationIndian Institute of Technology MadrasChennaiIndia

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