Marcin Stolarek

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We report on experimental evidence of unidirectional transmission of terahertz waves through a pair of metallic gratings with different periods. The gratings are optimized for a broadband transmission in one direction, accompanied with a high extinction rate in the opposite direction. In contrast to previous studies, we show that the zero-order(More)
We analyse numerically and experimentally the asymmetric transmission through sub-wavelength double metallic gratings. The possibility of achieving a broadband unidirectional transmission of THz waves through the grating is confirmed. The proposed gratings allow for efficient one-way transmission in the wavelength range from 2.5 to 3.5 mm.
We report on unidirectional and asymmetric transmission of radially polarized THz radiation through a dual circular metallic grating with sub-wavelength slits. Unidirectional transmission is shown theoretically for a super-Gaussian incident beam, and an asymmetric transmission is demonstrated experimentally, when the radially polarized beam of 0.1 THz is(More)
We derive periodic multilayer absorbers with effective uniaxial properties similar to a perfectly matched layer (PML). This approximate representation of a PML is based on effective medium theory, and we call it an effective medium PML (EM-PML). We also show that cylindrical core-shell nanostructures derived from flat multilayers also exhibit very good(More)
We analyse the coupling of THz radiation to a GaAs waveguide through a metallic grating with sub-wavelength slits. This result is compared to the coupling through a sub-wavelength-sized aperture in a chromium mask to a diffraction-free layered superlens at visible wavelengths. We demonstrate efficient coupling of a plane-wave to the multilayer. The mode(More)
We analyse the transmission of a linearly polarised plane-wave through a diffraction-free layered metamaterial stacked to another photonic crystal. The dispersion relation of the metamaterial at the resonant frequency allows for super-collimation of the incident light, while the photonic crystal introduces transverse momentum to excite a large number of(More)
We have developed a metallic double circular grating with sub-wavelength slits which blocks radially polarized light incident from one of its sides and acts as a focusing diffractive element in the other direction. The proposed grating has been optimized for the sub-THz frequency range. Unidirectional transmission through the grating has been demonstrated(More)
We describe layered metal-insulator metamaterials using the model of a linear-shift-invariant system. We present the modelling and optimisation strategy for engineering such metamaterials. A variety of point spread functions may be reached, either for superresolution, or for far-field image processing. The first group includes layered superlenses and(More)