Optimization and design of polymer terahertz wave plates

Mr. Carlos Miguel Garcia Rosas1, Dr. Xavier Ropagnol1,2, Dr. Mariia Zhuldybina2, Prof. Audrey Laventure3, Prof. Tsuneyuki Ozaki1
1Institut National de la Recherche Scientifique (INRS), Varennes, Canada. 2École de technologie supérieure (ÉTS), Montreal, Canada. 3Université de Montréal, Montreal, Canada


In this work, we conduct a comprehensive computational study using the finite element method for the design of a terahertz (THz) polarization converter based on a low-absorption polymer. The dimensions of the polymer THz wave plate studied in this work were chosen considering the capacity to provide a broadband phase difference. Our numerical simulations show that for the elliptical and catenary pillar structures, we observe that the amplitude of the transmission spectra for the x-polarization component is 10 times lower than the y-polarization component. However, the phase difference spectra of the elliptical structure show a conversion of linear polarization into quasi-circular over a range of 0.6 THz, while for the catenary structure, a change from linear polarization into quasi-elliptical between 0.4 and 1.2 THz.