@article{Dornhof2011,
  author    = {Dornhof, Sarah},
  title     = {Regimes of visibility representing violence against women in the French banlieue},
  series = {Feminist review},
  journal   = {Feminist review},
  number    = {98},
  publisher = {Palgrave Macmillan},
  address   = {Basingstoke},
  issn      = {0141-7789},
  doi       = {10.1057/fr.2011.2},
  pages     = {110 -- 127},
  year      = {2011},
  abstract  = {Recent discussions about violence against women have shifted their attention to specific forms of violence in relation to migration and Islam. In this article, I consider different modes of representing women's experiences in French immigrant communities. These representations relate to the French feminist movement Ni Putes Ni Soumises (neither whore nor submissive), a movement that in the early 2000s deplored both the sustained degradation of certain banlieue neighborhoods and also the charges and restrictions that this entails, particularly for young women. Drawing on different narratives and images of women's painful experience, I consider, in a first step, how the question of representing violence against (post) migrant women is framed in terms of the tension between universality and particularity within French republicanism. In the next part of my argument, I bring into focus the question of how to access women's suffering. For a perspective on pain not as an interiorized, private experience but as an accessible complex of practices, articulations, memories, visions and social reconfigurations, I consider Smain Laacher's sociological study (2008) about written testimonies of violent experience that had been addressed by (post) migrant women to French women organizations such as Ni Putes Ni Soumises. I finally suggest reading women's accounts on violence not in relation to a universal discourse of rights, but as a political contestation of the naturalized order of representing violence, suffering and agency inside French banlieue communities. Drawing on Jacques Ranciere's notion of dissensus, such a contestation can be staged through words by those who have no visibility in the representational order, words not to criticize the unaccomplished ideals of universal equality, but to create a universal community and a common language of experience in the mode of 'as-if'.},
  language  = {en}
}
@article{ShashevKupschLangeetal.2016,
  author    = {Shashev, Yury and Kupsch, Andreas and Lange, Axel and M{\"u}ller, Bernd R. and Bruno, Giovanni},
  title     = {Improving the visibility of phase gratings for Talbot-Lau X-ray imaging},
  series = {Materials testing : Materialpr{\~A}¼fung ; materials and components, technology and application},
  volume    = {58},
  journal   = {Materials testing : Materialpr{\~A}¼fung ; materials and components, technology and application},
  publisher = {Hanser},
  address   = {M{\"u}nchen},
  issn      = {0025-5300},
  doi       = {10.3139/120.110948},
  pages     = {970 -- 974},
  year      = {2016},
  abstract  = {Talbot-Lau interferometry provides X-ray imaging techniques with significant enhancement of the radiographic contrast of weakly absorbing objects. The grating based technique allows separation of absorption, refraction and small angle scattering effects. The different efficiency of rectangular and triangular shaped phase gratings at varying detector distances is investigated. The interference patterns (Talbot carpets) are modeled for parallel monochromatic radiation and measured by synchrotron radiation. In comparison to rectangular shapes of phase gratings much higher visibility is obtained for triangular shapes which yield enhanced contrast of a glass capillary test specimen.},
  language  = {en}
}
@phdthesis{Nayak2022,
  author    = {Nayak, Abani Shankar},
  title     = {Design, Characterization and On-sky Testing of an Integrated Optics Device for Stellar Interferometry: from Pupil Remappers to Discrete Beam Combiner},
  doi       = {10.25932/publishup-55874},
  url       = {http://nbn-resolving.de/urn:nbn:de:kobv:517-opus4-558743},
  school      = {Universit{\"a}t Potsdam},
  pages     = {xl, 175},
  year      = {2022},
  abstract  = {Stellar interferometry is the only method in observational astronomy for obtaining the highest resolution images of astronomical targets. This method is based on combining light from two or more separate telescopes to obtain the complex visibility that contains information about the brightness distribution of an astronomical source. The applications of stellar interferometry have made significant contributions in the exciting research areas of astronomy and astrophysics, including the precise measurement of stellar diameters, imaging of stellar surfaces, observations of circumstellar disks around young stellar objects, predictions of Einstein's General relativity at the galactic center, and the direct search for exoplanets to name a few. One important related technique is aperture masking interferometry, pioneered in the 1960s, which uses a mask with holes at the re-imaged pupil of the telescope, where the light from the holes is combined using the principle of stellar interferometry. While this can increase the resolution, it comes with a disadvantage. Due to the finite size of the holes, the majority of the starlight (typically > 80 \%) is lost at the mask, thus limiting the signal-to-noise ratio (SNR) of the output images. This restriction of aperture masking only to the bright targets can be avoided using pupil remapping interferometry - a technique combining aperture masking interferometry and advances in photonic technologies using single-mode fibers. Due to the inherent spatial filtering properties, the single-mode fibers can be placed at the focal plane of the re-imaged pupil, allowing the utilization of the whole pupil of the telescope to produce a high-dynamic range along with high-resolution images. Thus, pupil remapping interferometry is one of the most promising application areas in the emerging field of astrophotonics. At the heart of an interferometric facility, a beam combiner exists whose primary function is to combine light to obtain high-contrast fringes. A beam combiner can be as simple as a beam splitter or an anamorphic lens to combine light from 2 apertures (or telescopes) or as complex as a cascade of beam splitters and lenses to combine light for > 2 apertures. However, with the field of astrophotonics, interferometric facilities across the globe are increasingly employing some form of photonics technologies by using single-mode fibers or integrated optics (IO) chips as an efficient way to combine light from several apertures. The state-of-the-art instrument - GRAVITY at the very large telescope interferometer (VLTI) facility uses an IO-based beam combiner device reaching visibilities accuracy of better than < 0.25 \%, which is roughly 50× as precise as a few decades back. Therefore, in the context of IO-based components for applications in stellar interferometry, this Thesis describes the work towards the development of a 3-dimensional (3-D) IO device - a monolithic astrophotonics component containing both the pupil remappers and a discrete beam combiner (DBC). In this work, the pupil remappers are 3-D single-mode waveguides in a glass substrate collecting light from the re-imaged pupil of the telescope and feeding the light to a DBC, where the combination takes place. The DBC is a lattice of 3-D single-mode waveguides, which interact through evanescent coupling. By observing the output power of single-mode waveguides of the DBC, the visibilities are retrieved by using a calibrated transfer matrix ({U}) of the device. The feasibility of the DBC in retrieving the visibilities theoretically and experimentally had already been studied in the literature but was only limited to laboratory tests with monochromatic light sources. Thus, a part of this work extends these studies by investigating the response of a 4-input DBC to a broad-band light source. Hence, the objectives of this Thesis are the following: 1) Design an IO device for broad-band light operation such that accurate and precise visibilities could be retrieved experimentally at astronomical H-band (1.5-1.65 μm), and 2) Validation of the DBC as a possible beam combination scheme for future interferometric facilities through on-sky testing at the William Herschel Telescope (WHT). This work consisted of designing three different 3-D IO devices. One of the popular methods for fabricating 3-D photonic components in a glass substrate is ultra-fast laser inscription (ULI). Thus, manufacturing of the designed devices was outsourced to Politecnico di Milano as part of an iterative fabrication process using their state-of-the-art ULI facility. The devices were then characterized using a 2-beam Michelson interferometric setup obtaining both the monochromatic and polychromatic visibilities. The retrieved visibilities for all devices were in good agreement as predicted by the simulation results of a DBC, which confirms both the repeatability of the ULI process and the stability of the Michelson setup, thus fulfilling the first objective. The best-performing device was then selected for the pupil-remapping of the WHT using a different optical setup consisting of a deformable mirror and a microlens array. The device successfully collected stellar photons from Vega and Altair. The visibilities were retrieved using a previously calibrated {U} but showed significant deviations from the expected results. Based on the analysis of comparable simulations, it was found that such deviations were primarily caused by the limited SNR of the stellar observations, thus constituting a first step towards the fulfillment of the second objective.},
  language  = {en}
}