Infrared metasurfaces created with off-normal incidence microsphere photolithography

Graphene Plasmonic Metasurfaces to Steer Infrared Light

Metasurfaces utilizing engineered metallic nanostructures have recently emerged as an important means to manipulate the propagation of light waves in a prescribed manner. However, conventional metallic metasurfaces mainly efficiently work in the visible and near-infrared regime, and lack sufficient tunability. In this work, combining the pronounced plasmonic resonance of patterned graphene stru...

Stand-Off Biodetection with Free-Space Coupled Asymmetric Microsphere Cavities

Asymmetric microsphere resonant cavities (ARCs) allow for free-space coupling to high quality (Q) whispering gallery modes (WGMs) while exhibiting highly directional light emission, enabling WGM resonance measurements in the far-field. These remarkable characteristics make "stand-off" biodetection in which no coupling device is required in near-field contact with the resonator possible. Here we...

Increased normal incidence photocurrent in quantum dot infrared photodetectors

Normal Incidence Mid-Infrared Photocurrent in AlGaN/GaN Quantum Well Infrared Photodetectors

B. Sherliker, M.P. Halsalla,∗, P. Harrison, V.D. Jovanović, D. Indjin, Z. Ikonić, P.J. Parbrook, M.A. Whitehead, T. Wang, P.D. Buckle, J. Phillips and D. Carder Department of Physics, UMIST, Manchester M60 1QD, UK Department of Electronic and Electrical Engineering, The University of Leeds LS2 9JT, UK EPSRC National Centre for III–V Technologies Department of Electronic and Electrical Engineeri...

Normal incidence InAsÕAlxGa1ÀxAs quantum dot infrared photodetectors with undoped active region

We have performed a comprehensive investigation of n-type quantum dot infrared photodetectors ~QDIPs! based on InAs/GaAs epitaxical island quantum dots ~QDs! grown via the innovative punctuated island growth technique. The structural properties of the QDs were investigated with cross-sectional transmission electron microscopy and atomic force microscopy. The electronic properties of the QDs ins...