Abstract—This paper reports on a proof-of-concept microelectromechanical system-based Fabry–Perot filter that is capable of electrically tuning within the long-wave infrared thermal imaging band of 8–12 μm. The device employs a single-layer quarter-wavelength thick tensile germanium membrane for the suspended top mirror in order to achieve nanometer-scale as-released mirror flatness acr…
Abstract—This paper reports on the successful demonstration of Ge/ZnS-based Fabry–Perot filters operating in the longwave infrared (LWIR). The suitability of thermally deposited Ge and ZnS as thin-film mirror materials for micromachined LWIR Fabry–Perot filters has been fully investigated, and it is shown that a film growth temperature higher than 150 °C is key to depositing durable ZnS …