Giant and Broadband THz and IR Emission in Drift-biased Graphene-Based Hyperbolic Nanostructures

We demonstrate that Cherenkov radiation can be manipulated in terms of operation frequency, bandwidth, and efficiency by simultaneously controlling the properties of drifting electrons and the photonic states supported by their surrounding media. We analytically show that the radiation rate strongly depends on the momentum of the excited photonic state, in terms of magnitude, frequency dispersion, and its variation versus the properties of the drifting carriers. This approach is applied to design and realize miniaturized, broadband, tunable, and efficient terahertz and far-infrared sources by manipulating and boosting the coupling between drifting electrons and engineered hyperbolic modes in graphene-based nanostructures. The broadband, dispersive, and confined nature of hyperbolic modes relax momentum matching issues, avoid using electron beams, and drastically enhance the radiation rate - allowing that over 90% of drifting electrons emit photons. Our findings open a new paradigm for the development of solid-state terahertz and infrared sources.Comment: 4 figure

Dielectric particle-based strategy to design a new self-bending subwavelength structured light beams

During last 2 years it was shown that an electromagnetic field can be made to curve after propagation through a simple dielectric material of special shape, which adds a new-found degree of simplicity. This effect was termed 'photonic hooks' - it is a unique electromagnetic beam configuration behind a mesoscale dielectric particle with a broken symmetry and differ from Airy-family beams. PH features the radius of curvature, which is about 2 times smaller than the electromagnetic wavelength - this is the smallest curvature radius of electromagnetic waves ever reported. The nature of a photonic hook is in dispersion of the phase velocity of the waves inside of particle, resulting in interference. Here, we report a new dielectric particle-based strategy to design selfbending subwavelength structured light beams

Policing, Technology, and Doctrinal Assists

Sounding the alarm about technology, policing, and privacy has become an almost daily occurrence. We are told that the government’s use of technology as a surveillance tool is an “insidious assault on our freedom.” That it is “nearly impossible to live today without generating thousands of records about what we watch, read, buy and do—and the government has access to them.” The message is clear. Big Brother is watching. And we should be afraid. But the police use of technology, or what this Article terms “techno-policing,” does not have to be dystopian. This Article challenges conventional thinking and offers an entirely new way to think about technology and policing. Deployed properly, techno-policing—from the use of simple smartphone applications such as FaceTime and Google Hangout, to the deployment of high-tech surveillance cameras, terahertz scanners, Big Data, and Automated Suspicion Algorithms—can enhance the warrant requirement and the goals of transparency and accuracy. And at this time when crime levels are relatively low and there are growing demands for police accountability—think Black Lives Matter—techno-policing can enhance legitimacy. Most importantly, techno-policing can provide much needed doctrinal assists where Fourth Amendment doctrine alone has proved inadequate, shortsighted, and unfair

Scanning Saint Amandus: Medical Technologies and Medieval Anatomies

Anatomy -- the practice of stripping back the body and revealing it, part by part, for discussion and debate -- is a process much explored by the medical humanities, and it presents rich intellectual and practical potential for medieval studies. Tracing anatomical tendencies in the actions of both modern practitioners and inhabitants of the medieval past, this article advocates for anatomy’s addition to the rostra of bodily discourses at the disposal of historians of medieval culture. Posited as a critical framework in its own right, notions of anatomy, autopsy, and a literal bodily reading offer us new ways of opening up medieval studies today in much the same way as medieval bodies were once opened on the slab