Ultrathin 2 nm gold as ideal impedance-matched absorber for infrared light

Thermal detectors are a cornerstone of infrared (IR) and terahertz (THz) technology due to their broad spectral range. These detectors call for suitable broad spectral absorbers with minimalthermal mass. Often this is realized by plasmonic absorbers, which ensure a high absorptivity butonly for a narrow spectral band. Alternativly, a common approach is based on impedance-matching the sheet resistance of a thin metallic film to half the free-space impedance. Thereby, it is possible to achieve a wavelength-independent absorptivity of up to 50 %, depending on the dielectric properties of the underlying substrate. However, existing absorber films typicallyrequire a thickness of the order of tens of nanometers, such as titanium nitride (14 nm), whichcan significantly deteriorate the response of a thermal transducers. Here, we present the application of ultrathin gold (2 nm) on top of a 1.2 nm copper oxide seed layer as an effective IR absorber. An almost wavelength-independent and long-time stable absorptivity of 47(3) %, ranging from 2 $\mu$m to 20 $\mu$m, could be obtained and is further discussed. The presented gold thin-film represents analmost ideal impedance-matched IR absorber that allows a significant improvement of state-of-the-art thermal detector technology

Poly Economics-Capitalism, Class, and Polyamory

Academic research and popular writing on nonmonogamy and polyamory has so far paid insufficient attention to class divisions and questions of political economy. This is striking since research indicates the significance of class and race privilege within many polyamorous communities. This structure of privilege is mirrored in the exclusivist construction of these communities. The article aims to fill the gap created by the silence on class by suggesting a research agenda which is attentive to class and socioeconomic inequality. The paper addresses relevant research questions in the areas of intimacy and care, household formation, and spaces and institutions and advances an intersectional perspective which incorporates class as nondispensable core category. The author suggests that critical research in the field can stimulate critical self-reflexive practice on the level of community relations and activism. He further points to the critical relevance of Marxist and Postmarxist theories as important resources for the study of polyamory and calls for the study of the contradictions within poly culture from a materialist point of view. © 2013 Springer Science+Business Media New York