| Institut(e): | Institut
für Hochfrequenztechnik und Quantenelektronik der Universität
Karlsruhe Kaiserstr. 12 D-76128 Karlsruhe Tel.: +49 721 608-2481 Fax.: +49 721 608-2786 |
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| Projektleiter: | Prof. Dr.-Ing. Wolfgang Freude | w.freude@ihq.uni-karlsruhe.de |
| Sekretariat: | Dagmar Goldmann | ihq@uni-karlsruhe.de |
| Mitarbeiter: | Dipl.-Ing. Guy-Aymar Chakam | g.chakam@etec.uni-karlsruhe.de |
| Abstract: Integrated optical filters are key components for high-capacity photonic networks with wave-length division multiplexing (WDM) near a wavelength of lambda = 1.55 µm (frequency f_o = 193 THz). Integrateable optical filters, e. g., ring resonators in a silicon-on silica technique, require a structural precision in the 10-nm range, while electron beam lithography has a practical resolution of only 30..50 nm. Model experiments near f_m = 10 GHz need a much lower dimensional accuracy in the order of 10 nm x f_o/f_m = 0.2 mm, which can be easily achieved even with numerically controlled milling machines. We investigate various periodic two-dimensional photonic crystal model structures at microwave frequencies for checking our design procedure. As a further benefit, we can measure the fields using electric or magnetic probes. The optical silica substrate (refractive index n_{SiO_2} = 1.45) is modeled by micro-fibre filled PTFE (teflon) with n_{PTFE}^2 = (1.48)^2 = 2.2 in the microwave case, the optical silicon waveguides (refractive index n_{Si} = 3.44) are replaced with ceramic-filled PTFE having n_{cer}^2 = (3.3)^2 = 10.8. Besides the modeling of periodic structures intended to be realised at optical frequencies, we plan to design photonic crystals for direct microwave use. We are especially interested in two-dimensional photonic bandgap structures for suppressing parasitic parallel plate modes which limit the bandwidth of planar microwave antenna arrays with optical feeder networks. SPP meeting, March 2002, Bad Honnef |
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