期刊
IEEE ELECTRON DEVICE LETTERS
卷 32, 期 1, 页码 45-47出版社
IEEE-INST ELECTRICAL ELECTRONICS ENGINEERS INC
DOI: 10.1109/LED.2010.2086428
关键词
Fano effect; leaky-mode resonances (LMRs); light trapping; off-resonance; single coaxial nanowires
资金
- National Major Basic Research Project [2010CB933702]
- Natural Science Foundation of China [10734020, 11074169]
We report a strong enhancement of the light absorption in single coaxial nanowires (NWs) of Si core/dielectric shells. We have calculated the light absorption coefficient within the framework of the Lorenz-Mie light scattering theory and found out that it is greatly increased by effective light trapping in Si cores owing to dielectric shells, as compared to that in Si NWs. We show that the strong absorption of light stems mainly from off-resonance enhancement and also from resonance contribution. By optimally tuning the core radius, the shell thickness, and the shell refractive index, we have obtained similar to 102% increase of the photocurrent.
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