AAWSAP DIRD, Metamaterials for Aerospace Applications, April 2010

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Figure 6. Schematic of the SiC-Based Super-Lens Which is Imaging Sub-Wavelength Holes Buried Under
the Si02 Layer. The imaged objects are >../20 holes milled in gold using FIB. The scattered signal is picked up by
the tip of an NSOM and directed towards the IR detector. Depending on the imaging wavelength, either amplitude
(e) or the phase (f,g) of the signal are prominent.
As the laser beam scatters off the sub-wavelength holes, its electric field is picked up
by the tip of a Near-Field Scattering Optical Microscope (NSOM) and re-scattered into
the far-field. There it is interfered with the reference pulse and picked up by an infrared
detector. Note that this interferometric technique enables one to extract both the phase
and amplitude of the field, as shown in Figure 6. This significantly broadens the spectral
range over which the super-lens yields meaningful information . For example, the
amplitude contrast is highest at A = 10.85 µm shown in panel ( e) while the phase
contrasts are the highest at A =11.03 µm and A =10.65 µm.
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