| 摘要 |
<p>An optical device includes a projection group in which electric conductor projections are arranged along a direction (D1) parallel to a virtual plane (130). The arrangement period of the projections in the projection group includes at least a first period (P1) and a second period (P2) different from the first period. The first period and the second period are shorter than a wavelength of an incident light. By this arrangement a coupling efficiency of the incident light at varying angles to a surface plasmon polariton can be improved.
The optical device may be used as a sensor chip in a surface enhanced Raman scattering apparatus.</p> |
