| Autor: |
Siitonen, Samuli, Laakkonen, Pasi, Vahimaa, Pasi, Jefimovs, Konstantins, Kuittinen, Markku, Parikka, Marko, Mönkkönen, Kari, Orpana, Ahti |
| Zdroj: |
Applied Optics; October 2004, Vol. 43 Issue: 30 p5631-5636, 6p |
| Abstrakt: |
Ring-shaped and radial diffractive gratings are designed with rigorous diffraction theory to couple light of a nearly monochromatic LED into a thin planar light guide on the bottom side. The theoretical coupling efficiencies for ring-shaped and radial gratings are 41% and 66%, respectively. Optimized diffractive elements are manufactured with direct electron-beam lithography and reactive-ion-etching into SiO_2 substrates. Good agreement between experimental and theoretical results for selected radial gratings is reached. Furthermore, the mass production tests using injection molding are carried out with good replicability. |
| Databáze: |
Supplemental Index |
| Externí odkaz: |
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