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8 March 2014Metal membrane with dimer slots as a universal polarizer
In this work, we show theoretically and confirm experimentally that thin metal membranes patterned with an array of
slot dimers (or their Babinet analogue with metal rods) can function as a versatile spectral and polarization filter. We
present a detailed covariant multipole theory for the electromagnetic response of an arbitrary dimer based on the Green
functions approach. The theory confirms that a great variety of polarization properties, such as birefringence, chirality
and elliptical dichroism, can be achieved in a metal layer with such slot-dimer patterning (i.e. in a metasurface). Optical
properties of the metasurface can be extensively tuned by varying the geometry (shape and dimensions) of the dimer, for
example, by adjusting the sizes and mutual placement of the slots (e.g. inter-slot distance and alignment angle). Three
basic shapes of dimers are analyzed: II-shaped (parallel slots), V-shaped, and T-shaped. These particular shapes of
dimers are found to be sensitive to variations of the slots lengths and orientation of elements. Theoretical results are well
supported by full-wave three-dimensional simulations. Our findings were verified experimentally on the metal
membranes fabricated using UV lithography with subsequent Ni growth. Such metasurfaces were characterized using
time-domain THz spectroscopy. The samples exhibit pronounced optical activity (500 degrees per wavelength) and high
transmission: even though the slots cover only 4.3 % of the total membrane area the amplitude transmission reaches 0.67
at the resonance frequency 0.56 THz.
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Sergej Zhukovsky, Maksim Zalkovskij, Radu Malureanu, Christian Kremers, Dmitry Chigrin, Peter T. Tang, Peter U. Jepsen, Andrei V. Lavrinenko, "Metal membrane with dimer slots as a universal polarizer," Proc. SPIE 8989, Smart Photonic and Optoelectronic Integrated Circuits XVI, 89890T (8 March 2014);