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Design of Metamaterials for Transparent Electrodes, Anti-Reflection Coating, and Light Trapping Structures

Kafaie Shirmanesh, Ghazaleh | 2014

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  1. Type of Document: M.Sc. Thesis
  2. Language: Farsi
  3. Document No: 45944 (05)
  4. University: Sharif University of Technology
  5. Department: Electical Engineering
  6. Advisor(s): Mehrany, Khashayar; Khavasi, Amin
  7. Abstract:
  8. In several electro-optic and optoelectronic devices, we require the structures with simultaneous high electrical conductivity and optical transparency so as to transmit the incident light. Transparent Conductive Electrodes (TCEs) that are both highly conductive and transparent were introduced to be an answer to the mentioned challenge. Periodic arrays of metallic holes are amongst the most important structures that are used as transparent electrodes. Using the metals with low electrical resistivity, such as Au and Ag, provides these structures with high electrical conductance. On the other hand, since these micro/nano structures support the propagation of guided electromagnetic waves, light can be transmitted through them, hence, they show transparency to the incident light. Furthermore, due to the periodicity of these structures, light can be coupled into the photonic modes. As a result, these structures can trap the incident light. In this thesis, we designed transparent electrodes using arrays of metallic square holes. In order to efficiently design TCEs, we introduced an analytical circuit model for the mentioned metamaterials. The designed TCEs are highly transparent at a wide range of frequencies. Moreover, they show high electrical conductance which highlights them among the conventional transoarent electrodes. On the other hand, taking advantage of this analytical model, we investigated the use of these structures as anti-reflection coatings and light trapping structures
  9. Keywords:
  10. Circuit Model ; Antirelection Coating ; Transparent Conductive Electrode ; Metallic Square Hole Array ; Metamaterial ; Light Trapping Structure

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