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Proceedings Paper

Metal membrane with dimer slots as a universal polarizer
Author(s): Sergej Zhukovsky; Maksim Zalkovskij; Radu Malureanu; Christian Kremers; Dmitry Chigrin; Peter T. Tang; Peter U. Jepsen; Andrei V. Lavrinenko
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Paper Abstract

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.

Paper Details

Date Published: 8 March 2014
PDF: 7 pages
Proc. SPIE 8989, Smart Photonic and Optoelectronic Integrated Circuits XVI, 89890T (8 March 2014); doi: 10.1117/12.2039471
Show Author Affiliations
Sergej Zhukovsky, Technical Univ. of Denmark (Denmark)
Maksim Zalkovskij, Technical Univ. of Denmark (Denmark)
Radu Malureanu, Technical Univ. of Denmark (Denmark)
Christian Kremers, Bergische Univ. Wuppertal (Germany)
Dmitry Chigrin, Bergische Univ. Wuppertal (Germany)
RWTH Aachen (Germany)
Peter T. Tang, IPU (Denmark)
Peter U. Jepsen, Technical Univ. of Denmark (Denmark)
Andrei V. Lavrinenko, Technical Univ. of Denmark (Denmark)

Published in SPIE Proceedings Vol. 8989:
Smart Photonic and Optoelectronic Integrated Circuits XVI
Louay A. Eldada; El-Hang Lee; Sailing He, Editor(s)

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