Magnetic stimulation from cortically implantable microcoils can activate neuronal circuits with high selectivity and reliability.

Super-resolution imaging beyond Abbe's diffraction limit can be achieved by utilizing an optical medium or "metamaterial" that can either amplify or transport the decaying near-field evanescent waves that carry subwavelength features of objects. Earlier approaches at optical frequencies mostly utilized the amplification of evanescent waves in thin metallic films or metal-dielectric multilayers, but were restricted to very small thicknesses ͑Ӷ , wavelength͒ and accordingly short object-image distances, due to losses in the material. Here, we present an experimental demonstration of super-resolution imaging by a low-loss three-dimensional metamaterial nanolens consisting of aligned gold nanowires embedded in a porous alumina matrix. This composite medium possesses strongly anisotropic optical properties with negative permittivity in the nanowire axis direction, which enables the transport of both far-field and near-field components with low-loss over significant distances ͑Ͼ6 ͒, and over a broad spectral range. We demonstrate the imaging of large objects, having subwavelength features, with a resolution of at least / 4 at near-infrared wavelengths. The results are in good agreement with a theoretical model of wave propagation in anisotropic media.

The first electromagnetic metamaterials (EM3) produced by microfabrication are reported. They are based on the rod-split-ring-resonator design as proposed by Pendry et al. [IEEE Trans. Microwave Theory Tech. 47, 2075 (1999)] and experimentally confirmed by Smith et al. [Phys. Rev. Lett. 84, 4184 (2000)] in the GHz frequency range. Numerical simulation and experimental results from far infrared (FIR) transmission spectroscopy support the conclusion that the microfabricated composite material is EM3 in the range 1-2.7 THz. This extends the frequency range in which EM3 are available by about 3 orders of magnitude well into the FIR, thereby widely opening up opportunities to verify the unusual physical implications on electromagnetic theory as well as to build novel electromagnetic and optical devices.

Nanoporous oxide coatings, such as anodic aluminum oxide (AAO), are utilized as drug‐release platforms for up to weeks of delivery (see picture for doxorubicin, Dox). A burst‐release phase is followed by sustained release, the kinetics of which is described by an activated surface‐density‐dependent desorption model.