Surface polaritons in the systems air-ZnO-SiO_2 and air-Ge-BeO: experiment and calculations

摘要

For the air-ZnO-SiO_2 system (d_(ZnO)～0.1-10 μm, 400-600 cm~(-1) spectral region) we show that there exist three branches of surface polaritons (～420-430, 470-520 and 520-570 cm~(-1)), the first of them being weak for all d_(ZnO). For model medium instead of SiO_2, one of two SP branches which one has for ZnO film in air gradually transforms to two branches. The calculations predict wave-guide branches in both p- and s-polarizations below 420 cm~(-1). For the air-Ge-BeO system (d_(ZnO) ～0.1-10 μm, 600-1200 cm~(-1)), deposition of Ge allows one to move the SP absorption away from the frequency of CO_2 laser (960 cm~(-1)).