Ethical and professional issues: Reflections on course evolution, innovation and student engagement.

At INSPIRE 2013 we outlined our efforts to develop a core first year undergraduate course entitled ‘Computing Technology in Society’. A primary course objective is to demonstrate the potential impact that ever more complex, interconnected digital systems may have on the both the individual and on society in general. This provides the backdrop against which we endeavour to foster an ethos in which students are encouraged to establish a personal ethical position in relation to the application and deployment of digital systems. Here we reflect on further progress in developing this course with particular reference to ongoing curriculum development, student evaluation and, most crucially, student engagement. Additionally, we outline developments relating to our integration of technologies into the educational experience. We draw on our experience with the CTIS course to consider broader ramifications of technology infusion, particularly in relation to increased VLE integration and the streaming/recording of lectures.n/

Tungsten disulfide-gold nanohole hybrid metasurfaces for nonlinear metalens in the visible region

Recently, nonlinear hybrid metasurface comes into an attractive new concept in the research of nanophotonics and nanotechnology. It is composed of semiconductors with an intrinsically large nonlinear susceptibility and traditional plasmonic metasurfaces, offering opportunities for efficiently generating and manipulating nonlinear optical responses. A high second-harmonic generation (SHG) conversion efficiency has been demonstrated in the mid-infrared region by using multi-quantum-well (MQW) based plasmonic metasurfaces. However, it has yet to be demonstrated in the visible region. Here we present a new type of nonlinear hybrid metasurfaces for the visible region, which consists of a single layer of tungsten disulfide (WS2) and a phased gold nanohole array. The results indicate that a large SHG susceptibility of ~0.1 nm/V at 810 nm is achieved, which is 2~3 orders of magnitude larger than that of typical plasmonic metasurfaces. Nonlinear metalenses with the focal lengths of 30 {\mu}m, 50 {\mu}m and 100 {\mu}m are demonstrated experimentally, providing a direct evidence for both generating and manipulating SH signals based on the nonlinear hybrid metasurfaces. It shows great potential applications in designing of integrated, ultra-thin, compacted and efficient nonlinear optical devices, such as frequency converters, nonlinear holography and generation of nonlinear optical vortex beam