A new optically tunable low-pass filter (LPF) is presented with a cutoff frequency ranging from 13.71 GHz to 14.79 GHz. Tunability is achieved based on a novel metal insulator metal (MIM) capacitor having a photorefractive insulator that shows 13% change in capacitance. The LPF has been fabricated and measured, and a simple lumped element model extracted to analyze its behavior. The improved meshed MIM capacitor employed in the LPF marks a practical demonstration of an optically tuned filter.

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Keywords lowpass filter, MIM capacitor, optical tunable filter
Persistent URL dx.doi.org/10.1002/mop.29939
Journal Microwave and Optical Technology Letters
Gonzalez, J.M., Delhote, N., Baillargeat, D., McGarry, S, & Roy, L. (2016). Optically tunable filter based on meshed CDS-polymer MIM capacitor. Microwave and Optical Technology Letters, 58(8), 1926–1929. doi:10.1002/mop.29939