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Modeling Optomechanical Behavior of Optical Metasurfaces Subject to Light and Elastic Deformation

Talebi Habibabadi, Sajjad | 2022

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  1. Type of Document: M.Sc. Thesis
  2. Language: Farsi
  3. Document No: 54991 (08)
  4. University: Sharif University of Technology
  5. Department: Mechanical Engineering
  6. Advisor(s): Naghdabadi, Reza
  7. Abstract:
  8. Optical metasurfaces are 2D structures of a repetitive arrangement of a number of nanoparticles that are artificially constructed and do not exist in nature. Important applications of optical metasurfaces are meta lenses, flexible solar cells and extremely small antennas. Fabricating surfaces with nanoparticles of proper geometry under light radiation along with elastic deformation, we can have optical metasurfaces with selective reflection or transparency in the visible spectrum. The aim of this project is modeling of an optical metasurface with elastic deformation leading to change of color and transparency. For this purpose, assuming vertical light radiation and linear polarization, we study the effects of substrate, and geometry, material and arrangement of the nanoparticles as well as temperature and environment of the optical metasurface. In this regard, we used PDMS and silica glass as substrate, and gold, silver, sodium and soot as the nanoparticles for the optical metasurface. Also, the nanoparticles with the geometry of square, rectangle, circle, elipse and lozenge are used in this research. Under light radiation with frequencies in the visible spectrum, the transparency of the optical metasurface increases more than 50% under 100% elastic strain of its substrate, in other words it changes from opaque to transparent. In addition, the optical metasurface can be more than 60% transparent by rotating it 90 degrees around the vertical axis that changes it from opaque to transparent. Moreover, temperature and type of environment on the amount of reflection and transmittance affect the metasurface optical properties less than 10%; Therefore, the metasurface optical properties are stable at different temperatures and environments. The results of this project can be used in design of optical metasurfaces that experience change color and trancparency with elastic deformation, such as optical strain gages
  9. Keywords:
  10. Elastic Deformation ; Transparency ; Recoloring ; Nanoparticles Geometry ; Optomechanical Behavior Modeling ; Optical Metasurfaces

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