| Summary: | 碩士 === 國立成功大學 === 物理學系 === 106 === We constructed the spatial distribution of the magnetic field caused by an electromagnetic wave going through a sub-wavelength focusing structure in a perfect electrical conductor (PEC) film with a single point source model. Through the whole process, we hope to understand more about sub-wavelength wave mechanics.
The total energy flow through the slit is obtained from a small system simulation, and the amplitude of the single point source model is obtained by the conservation of energy flow. In addition, by theoretically analyzing the relationship between the phase and energy of the electromagnetic wave in the metal groove, we find that the distance between the slit and the groove does not affect the ratio of the energy radiated from the groove to the far field. The energy ratio is only caused by the groove depth because of the phase difference of the electromagnetic wave. We have built a fulcrum wave source model that can reduce a large number of computations over simple and straightforward approaches; by this method, we believe it can be applied to more of the optical properties of the structure to increase our understanding of subwavelength dynamics.
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