Metamaterials for optical and THz ranges: design and characterization
Loading...
Journal Title
Journal ISSN
Volume Title
School of Electrical Engineering |
Doctoral thesis (article-based)
| Defence date: 2014-06-03
Checking the digitized thesis and permission for publishing
Instructions for the author
Instructions for the author
Unless otherwise stated, all rights belong to the author. You may download, display and print this publication for Your own personal use. Commercial use is prohibited.
Author
Date
2014
Major/Subject
Mcode
Degree programme
Language
en
Pages
68 + app. 48
Series
Aalto University publication series DOCTORAL DISSERTATIONS, 55/2014
Abstract
The thesis is devoted to the field of metamaterials (MtMs) - effectively continuous artificial composites with advantageous electromagnetic properties not normally met in nature. The main goal of the work is the engineering of MtMs with new and extreme electromagnetic properties and their electromagnetic characterization. The first part of the thesis is focused on the artificial magnetism and isotropic negative permittivity and permeability in the near-infrared and visible ranges. Several design solutions based on resonant complex-shaped inclusions are proposed and studied analytically and numerically. In the first design utilization of clusters of plasmonic dimers leads to the negative permeability in the near-infrared range. Next suggested MtM consisting of the clusters of plasmonic triangular nanoprisms possesses isotropic negative permeability on the boundary between the near-infrared and visible ranges. The third design based on core-shell metal-dielectric particles allows for the isotropic negative refractive index in the near-infrared range. The second part of the thesis is devoted to the problem of characterization of planar and bulk MtMs. At first, the applicability of the so-called Holloway-Kuester method is studied for the planar arrays of complex inclusions. It is shown, that despite the fact that the approach initially was developed for the arrays of solid particles in the quasi-static approximation, it is also applicable for the arrays of rather optically substantial resonant clusters of plasmonic nanoparticles. Then, the method of homogenization of bulk MtMs is suggested, based on the account of electromagnetic interaction between crystal planes forming an orthorhombic lattice. The method reveals the electromagnetic properties not covered by the standard quasi-static homogenization procedures. The last research problem studied in the thesis is the engineering of planar multifunctional MtMs for the THz range. The suggested MtM consists of resonant metal stripes put on both sides of an elastic polymer film and allows for the combination of polarization transformation properties with sensitivity to the applied strain. The design is studied theoretically, numerically, and experimentally. For the last purpose an original fabrication method is developed, allowing for the rather simple creation of optically large samples. The fabricated sample experimentally demonstrates a high sensitivity to stretching in the transmission coefficient for the co-polarized field.Description
Supervising professor
Simovski, Constantin, Prof., Aalto University, Department of Radio Science and Engineering, FinlandKeywords
metamaterials, metasurfaces, plasmon resonance, artificial magnetism, characterization
Other note
Parts
- [Publication 1]: D. K. Morits and C. R. Simovski, “Negative effective permeability at optical frequencies produced by rings of plasmonic dimers”, Phys. Rev. B, vol. 81, no. 20, p. 205112 (7 pages), May 2010.
- [Publication 2]: D. Morits and C. Simovski, “Electromagnetic characterization of planar and bulk metamaterials: A theoretical study”, Phys. Rev. B, vol. 82, no. 16, p. 165114 (10 pages), Oct. 2010.
- [Publication 3]: D. Morits and C. Simovski, “Isotropic negative effective permeability in the visible range produced by clusters of plasmonic triangular nanoprisms”, Metamaterials, vol. 5, no. 4, pp. 162-168, Jun. 2011.
- [Publication 4]: D. Morits and C. Simovski, “Isotropic negative refractive index at near infrared”, J. Opt., vol. 14, no. 12, p. 125102 (7 pages), Nov. 2012.
- [Publication 5]: D. Morits, M. Morits, V. Ovchinnikov, M. Omelyanovich, A. Tamminen, S. Tretyakov and C. Simovski, “Multifunctional stretchable metasurface for the THz range”, J. Opt., vol. 16, no. 3, p. 032001 (7 pages), Feb. 2014.
