Fibonacci or bifocal terahertz (THz) imaging based on silicon diffractive zone plate in a continuous wave mode at 0.6 THz is demonstrated. Silicon as a low absorbing material was used in the laser ablation process to ...
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ISBN:
(数字)9781510629424
ISBN:
(纸本)9781510629424
Fibonacci or bifocal terahertz (THz) imaging based on silicon diffractive zone plate in a continuous wave mode at 0.6 THz is demonstrated. Silicon as a low absorbing material was used in the laser ablation process to fabricate the Fibonacci structures. Zone plates were designed by the three-dimensional finite-differencetime-domainmethod. To illustrate the Fibonacci focusing, the performance was studied both theoretically and experimentally by determining spatial profiles, the distance between the foci and the focal depth at frequencies of 0.3 THz and 0.6 THz. Terahertz images of various packaged objects at the 0.6 THz frequency were simultaneously recorded with the spatial resolution of wavelength in two different planes separated by 7 mm distance. Imaging performance using the Fibonacci lens is compared with the operation of the conventional silicon phase zone plate.
A simple method for the computation of 3d scatterers remotely located from the source with layered media is presented. This domaindecomposition method is based on the total-field/scattered-field formulation of the 3d...
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A simple method for the computation of 3d scatterers remotely located from the source with layered media is presented. This domaindecomposition method is based on the total-field/scattered-field formulation of the 3dfinite-difference in time-domainmethod. The electromagnetic field along the propagation path is not directly involved;it focuses only on the electromagnetic field in the surroundings of the scatterer. The incident electromagnetic field radiated from the source is computed separately with an adaptive algorithm and then applied on the Huygens' surface, leading to the proposed hybridisation technique.
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