Abstract
The effect of grating shapes on optical transmission in a bull's eye structure (a single subwavelength hole surrounded by a concentric grating in a metal) is discussed. Finite-difference time-domain calculations predict that a sharp-apex shape gives as high a reflective structure to the propagating surface plasmon polaritons (SPPs) as does a rectangular shape. Fabricated samples with a sharp-apex grating actually show large optical transmission (a factor of 400 greater than that of samples with a single hole) even when the number of corrugations is three. This result indicates that a sharp-apex grating acts as an effective SPP reflector to confine the energy around the hole, resulting in high optical throughput.
| Original language | English |
|---|---|
| Pages (from-to) | L170-L172 |
| Journal | Japanese Journal of Applied Physics, Part 2: Letters |
| Volume | 44 |
| Issue number | 1-7 |
| DOIs | |
| Publication status | Published - 2005 |
| Externally published | Yes |
Keywords
- Enhanced optical transmission
- Grating structure
- Resonant structure
- SPP scattering
- Subwavelength hole
- Surface plasmon polariton (SPP)
ASJC Scopus subject areas
- Engineering(all)
- Physics and Astronomy(all)