Finite-difference time-domain study of Si nanorod arrays with UV and green light

다국어 초록 (Multilingual Abstract)

The fnite-diference time-domain (FDTD) simulation on the absorption properties of Si nanorods with diferent spacings at UV and green light has been conducted. It was revealed that the enhanced absorption along the sidewalls of Si nanorods occurred, parallel to the light polarization directions, at UV-light while the green light is literally confned towards the nanorod center which leads to the V-shape absorption. The signifcant diference in absorption profle at two diferent illuminations is mainly due to the distinct origin of the light-matter interactions. For the UV light, the polarization induced local electric feld in the gap between nanorods is responsible for the results observed. However, the confned prolonged absorption of the green light is attributed to the non-negligible total internal refection inside Si nanorod waveguide.

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