Determination of the point spread function of layered metamaterials assisted with the blind deconvolution algorithm

Pastor D., Stefaniuk T., Wróbel P., Zapata-Rodriguez C., Kotyński R.

Optical and Quantum Electronics

47 (1), 2015, 17-26, 10.1007/s11082-014-0010-4

We propose to use the blind deconvolution and its modification to extract the point spread function (PSF) of layered metamaterials from a SNOM measurement. The measurement results are processed using the blind deconvolution algorithm to reconstruct the real-valued non-coherent PSF, or using the modified blind deconvolution introduced in this paper to reconstruct the complex-valued coherent PSF. The two algorithms are tested in simulations with a layered metamaterial deposited on a thin metallic mask with test apertures. We show that the modified algorithm is capable of recovering the approximate shape of complex PSF with a sub-wavelength full width at half maximum from a measurement in which the apertures are larger than the wavelength.