| 摘要 |
When light is made incident into antenna layers 11 a, 11 b, and 11 c of a photodetector 1 , specific wavelength components of light contained in the incident light combine with surface plasmons of the antenna layers 11 a, 11 b, and 11 c, and surface plasmon resonance occurs. Thereby, near-field lights are outputted from through-holes 13 of the antenna layers 11 a, 11 b, and 11 c. The near-field light outputted from each through-hole 13 reaches a light absorbing layer 4 via light receiving surfaces 4 a, 4 b, and 4 c. The light absorbing layer 4 generates a charge of an amount according to the amount of received light. Since cycle intervals Lambdaa, Lambdab, and Lambdac of convex portions 12 in the antenna layers 11 a, 11 b, and 11 c are different from each other, the wavelength component of light that combines with a surface plasmon differs in each of the antenna layers 11 a, 11 b, and 11 c. Consequently, a plurality of wavelength components of light can be detected.
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