Keywords and Phrases
Chiral; LCP; Metasurface; Plasmonic; RCP
“The mid-infrared design of chiral metamaterial shows a tremendous absorption capability of infrared rays, and it has the significant application of circular dichroism based device development. Plasmon-phonon coupling is one of the application of metamaterial that provides a new path for tailoring the surface in the nanoscale, which is also applicable in molecules detection. It is possible to change the Plasmon-Phonon coupling strength not only through the chemical change of molecules but also by changing the metamaterial light-matter interaction property. So far, linearly polarized light shows the strong coupling between metamaterial and molecules. However, it is possible to observe strong coupling in circularly polarized light by fabricating the chiral metasurface. In this research, we introduce two types of new chiral metasurface that has strong interaction with the molecules in different circular polarization of light, which exhibits over 58% and 65% circular dichroism (CD) in the mid-infrared region (5- 6 μm). By adjusting the geometric parameters of the new chiral structure of single-sized unit cells, it is possible to shift the absorption peak in the various midinfrared range. Besides that, we design the broadband resonator by combining the multiple chiral structures. For the molecule’s detection, It also shows a higher splitting gap in the right circularly polarized light in compare to Left circular polarized light. Our numerical and experimental result of the C=0 bands signals which emits from polymethyl methacrylate (PMMA) film using chiral metasurface unveils the effective way for tuning the coupling strength of molecules in circular polarization of light”--Abstract, page iii.
Mechanical and Aerospace Engineering
M.S. in Mechanical Engineering
Missouri University of Science and Technology
ix, 35 pages
© 2020 Md Shamim Mahmud, All rights reserved.
Thesis - Open Access
Mahmud, Md Shamim, "Mid-infrared chiral metsurface coupling with molecular vibration" (2020). Masters Theses. 8027.