Metal membrane with dimer slots as a universal polarizer

Sergei Zhukovsky, Maksim Zalkovskij, Radu Malureanu, Christian Kremers, Dmitry Chigrin, Peter Torben Tang, Peter Uhd Jepsen, Andrei Lavrinenko

Research output: Chapter in Book/Report/Conference proceedingArticle in proceedingsResearchpeer-review

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.
Original languageEnglish
Title of host publicationProceedings of SPIE
Volume8989
PublisherSPIE - International Society for Optical Engineering
Publication date2014
Pages89890T
DOIs
Publication statusPublished - 2014
EventSmart Photonic and Optoelectronic Integrated Circuits XVI, - The Moscone Cente, San Francisco, California, United States
Duration: 7 Feb 201412 Feb 2014

Conference

ConferenceSmart Photonic and Optoelectronic Integrated Circuits XVI,
LocationThe Moscone Cente
CountryUnited States
CitySan Francisco, California
Period07/02/201412/02/2014
SeriesProgress in Biomedical Optics and Imaging
ISSN1605-7422

Keywords

  • Polarization conversion
  • Polarizator
  • Terahertz devices
  • Chiral metamaterials
  • Dimer metasurface

Cite this

Zhukovsky, S., Zalkovskij, M., Malureanu, R., Kremers, C., Chigrin, D., Tang, P. T., ... Lavrinenko, A. (2014). Metal membrane with dimer slots as a universal polarizer. In Proceedings of SPIE (Vol. 8989, pp. 89890T). SPIE - International Society for Optical Engineering. Progress in Biomedical Optics and Imaging https://doi.org/10.1117/12.2039471