Towards the assessment of biomechanical interfaces: Topography of hidden objects obtained with THz holography

We report on the first steps towards THz imaging of biomechanical interfaces. A THz digital holography setup in reflection is used with synthetic aperture techniques to reconstruct the profile of a fingertip replica with a lateral resolution of 200 μm and a depth resolution of 20 μm. A method for the reconstruction of the profile of a sample hidden behind a THz-transparent material is also proposed. Experimental proof is provided by retrieving the bent profile of a metallic resolution target behind a Teflon plate.