[IEEE The Fifth International Kharkov Symposium on Physics and Engineering of Microwaves, Millimeter, and Submillimeter Waves - Kharkov, Ukraine (21-26 June 2004)] The Fifth International Kharkov Symposium on Physics and Engineering of Microwaves, Millimeter, and Submillimeter Waves (IEEE Cat. No.04EX828) - Refine treatment of plasmon mediated photoconductivity resonances in a grid-gated double-quantum-well field-effect transistor