An apparatus based on the split-post dielectric resonator was designed and verified for the purpose of measuring the microwave properties of optically sensitive materials.The apparatus was then used to confirm that a material consisting of micro sized photoconductive particles added to an insulating polymer would show an increase in the effective dielectric constant while under optical illumination. The semiconductor-polymer composite showed a change in dielectric constant and dielectric loss tangent from 5.5 to 6.1 and 0.05 to 0.09 respectively. Copyright

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Keywords optically tunable dielectric, photoconductive, resonant complex permittivity measurement technique
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Journal Microwave and Optical Technology Letters
Jess, N. (Nathan), Syrett, B, McGarry, S, & Roy, L. (2013). A new hybrid-polymer optically tunable dielectric and its measurement using a variation on the split-post dielectrc resonator. Microwave and Optical Technology Letters, 55(6), 1304–1305. doi:10.1002/mop.27545