Large-aperture Fabry-Perot filters based on silicon/silicon carbonitride distributed Bragg reflectors for the near-infrared
This contribution presents silicon carbonitride as a new low refractive index material for integration together with silicon in suspended distributed Bragg reflector membranes. We show how its benign mechanical stress properties can be used to fabricate inherently flat mirror membranes of up to 5 mm diameter. Due to the large refractive index contrast to silicon such mirror membranes exhibit high reflectance over a wide spectral range. Using these mirrors, we demonstrate a proof of concept for a large aperture Fabry-Perot filter with narrow bandwidth that could help miniaturize hyperspectral imaging sensors.
Optical transmission performance of a surface-micromachined Fabry–Pérot interferometer for thermal infrared
We developed a surface-micromachined tunable Fabry–Pérot interferometer for the thermal infrared spectral range of wavelengths 7–12 µm. In this paper, we present the device performance in terms of the optical transmission and the tunability. The device represents the first layout that proved successful in terms of the manufacturing process yield (about 80%). The optical transmission over the wavelengths from 3 to 20 µm is presented with the emphasis on analysing the first-order transmission peak. The transmission band width and the peak height are compared using the existing theory for this type of an interferometer. The deviation from an ideal performance is resolved and partly explained through the known structural unidealities.
Old topics, old approaches? ‘Reception’ in television studies and music studies
The question of reception is closely linked to the history and the roots of audience studies. But what is ‘reception’ and what exactly does it mean? As audience studies have developed from a contested novelty to a now established academic field, what do we do with a concept that defined our interests in the past and may now be too wide or even obsolete? This article deals with this issue by mapping how the concept of reception was conceptualized and researched in audience studies of the past ten years, with a focus on studies of music and studies of television. We find that in music, strong focus remains on music reception in the context of performances and events, and this lies in contrast to a small number of studies which instead focus on a framework of music in ordinary life and the audiences’ contextual localities. Concerning reception of television, much of the scholarship starts from the cultural studies tradition and looks at television viewing as a means to construct identities. Discussing these findings, we inquire whether the hybridization of media also implies a hybridization of research traditions and methodologies, and what consequences it has for the balance between textual, production and audience approaches.