Film policy under globalization: the case of Mexico

The changing economic and technological conditions often referred to as ‘globalization’ have had a deep impact on the very nature of the state, and thus on the aims, objectives and implementation of cultural policy, including film policy. In this paper, I discuss the main changes in film policy there have been in Mexico, comparing the time when the welfare state regarded cinema as crucial to the national identity, and actively supported the national cinema at the production, distribution and exhibition levels (about 1920-1980), and the recent onset of neoliberal policies, during which the industry was privatized and globalized. I argue the result has been a transformation of the film production, from the properly ‘national’ cinema it was during the welfare state—that is, having a role in nation building, democratization processes and being an important part of the public sphere—into a kind of genre, catering for a very small niche audience both domestically and internationally. However, exhibition and digital distribution have been strengthened, perhaps pointing towards a more meaningful post-national cinema.

Development of large-scale colloidal crystallisation methods for the production of photonic crystals

Colloidal photonic crystals have potential light manipulation applications including; fabrication of efficient lasers and LEDs, improved optical sensors and interconnects, and improving photovoltaic efficiencies. One road-block of colloidal selfassembly is their inherent defects; however, they can be manufactured cost effectively into large area films compared to micro-fabrication methods. This thesis investigates production of ‘large-area’ colloidal photonic crystals by sonication, under oil co-crystallization and controlled evaporation, with a view to reducing cracking and other defects. A simple monotonic Stöber particle synthesis method was developed producing silica particles in the range of 80 to 600nm in a single step. An analytical method assesses the quality of surface particle ordering in a semiquantitative manner was developed. Using fast Fourier transform (FFT) spot intensities, a grey scale symmetry area method, has been used to quantify the FFT profiles. Adding ultrasonic vibrations during film formation demonstrated large areas could be assembled rapidly, however film ordering suffered as a result. Under oil cocrystallisation results in the particles being bound together during film formation. While having potential to form large areas, it requires further refinement to be established as a production technique. Achieving high quality photonic crystals bonded with low concentrations (<5%) of polymeric adhesives while maintaining refractive index contrast, proved difficult and degraded the film’s uniformity. A controlled evaporation method, using a mixed solvent suspension, represents the most promising method to produce high quality films over large areas, 75mm x 25mm. During this mixed solvent approach, the film is kept in the wet state longer, thus reducing cracks developing during the drying stage. These films are crack-free up to a critical thickness, and show very large domains, which are visible in low magnification SEM images as Moiré fringe patterns. Higher magnification reveals separation between alternate fringe patterns are domain boundaries between individual crystalline growth fronts.