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A computational model allowing for the study of terahertz photoconductive antennas is presented. This model allows for nanoscale geometry variations in three dimensions. The model is validated using measurements data. The preliminary results illustrate the effectiveness of the model in calculating the time-dependent photocurrent collected by the antenna as well as the total photocurrent enhancement...
The enhancement of absorbed electromagnetic energy of thin-film silicon photovoltaics due to toroid-shaped plasmonic nanoparticles is computationally investigated. Using Ansys® HFSS, infinite arrays of silver nanotoroids of various sizes are tuned to maximize the photocurrent generation of the photovoltaic. The obtained results show that larger nanotoroid arrays can be tuned to provide enhanced photocurrent...
Quasi-3D helix metamaterial is constructed from multilayered 2D spiral structure with capacitive coupling between the adjacent layers. The sample is implemented with PCB, and linearly polarized microwave source is used in the measurement. The polarization plane is rotated to the opposite directions with left- and right-handed samples. The ratio of rotation angles is consistent with theoretical prediction.
Enhanced absorption in silicon is needed to improve the efficiency of solar cells. Silver nanotoroids placed on top of a silicon substrate demonstrate larger absorption, will be presented. The method of moments is employed to compute the near electric fields absorbed in silicon substrate. The results show surface waves represented by large electric fields normal to the silicon surface and decayed...
Aluminum induced crystallization (AIC) of amorphous silicon (a-Si) may potentially be causing the formation of plasmonic nanostructures on the silicon surface. Field enhancement within the silicon layer will be quantified in order to develop an understanding of the observed enhancement. Computer simulations using HFSS are presented here. The electric fields absorbed inside the silicon are obtained...
This paper investigates the polarization rotation effect of metamaterial with a lattice of flattened spiral segments. This multilayered structure can be fabricated easily, and the simulation result shows that it can rotate the polarization effectively.
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