Photonic Band Gap (PBG) Materials

                                                                                                                                                                                                                                             Caleb Christensen, MM wave PBG measurement

PBG materials are periodic arrays of dielectrics that exhibit stop bands for the propagation of electromagnetic waves. Considerable theoretical modeling on such structures is carried out using techniques developed at MRC and ISU, and structures are fabricated. To date structures with band gaps in the 12 GHz, 100 GHz, 350 GHz, and 500 GHz regions have been made. The MRC was the first to design and fabricate such structures with band gaps above 100 GHz. Notch filters, antennas, directional filters, millimeter­wave devices, and metallic PGB structures are being fabricated and tested. In addition, fabrication techniques for both higher­ and lower­frequency PBG materials are being developed.

MRC scientists and students have established a world-class laboratory for research in photovoltaic (solar) energy conversion materials and devices. The program focuses on growth of thin film electronic materials suitable for photovoltaic conversion, and on fabricating devices in them. Current materials of interest include amorphous Si and its alloys, and CdTe.

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