Optically Implemented Broadband Blueshift Switch in the Terahertz Regime

Cataloged from PDF version of article.We experimentally demonstrate, for the first time, an optically implemented blueshift tunable metamaterial in the terahertz (THz) regime. The design implies two potential resonance states, and the photoconductive semiconductor (silicon) settled in the critical region plays the role of intermediary for switching the resonator from mode 1 to mode 2. The observed tuning range of the fabricated device is as high as 26% (from 0.76 THz to 0.96 THz) through optical control to silicon. The realization of broadband blueshift tunable metamaterial offers opportunities for achieving switchable metamaterials with simultaneous redshift and blueshift tunability and cascade tunable devices. Our experimental approach is compatible with semiconductor technologies and can be used for other applications in the THz regime

Nonlinear imaging and THz diagnostic tools in the service of cultural heritage

We present the use of novel nonlinear imaging, terahertz time-domain spectroscopy and imaging as powerful diagnostic tools for studies of works of art. It is shown that nonlinear imaging offers precise in-depth information, while terahertz imaging can reveal hidden objects and uncover information on highly absorbing organic compounds whose visualization is difficult in other parts of the spectrumThe authors acknowledge Ms. K. Melessanaki for her expert assistance in the preparation of samples. This work was supported by the EU Marie Curie Excellence Grant “MULTIRAD” MEXT-CT-2006-042683. The EU FP7 Program “LASERLABEUROPE” (grant n◦ 228334) is also acknowledgedPostprint (published version

Functionalization of gold screen printed electrodes with bacterial photosynthetic reaction centers by laser printing technology for mediatorless herbicide biosensing

The development of an amperometric biosensor for herbicide detection, using bacterial reaction centers (RC) as biorecognition element, is presented. RC immobilization on gold screen printed electrodes was achieved by LIFT, a powerful physisorption-based immobilization technique that enhances the intimate contact between the protein and the electrode surface. As a result, stable photocurrents driven by direct electron transfer at the donor side were observed, both in the presence and in the absence of a quinone substrate in solution. The addition of quinone UQ(0) increased the photocurrents, while the UQ(0)-free system showed higher sensitivity to the herbicide terbutryn, a model inhibitor, acting as photocurrent attenuator. In spite of its simple design, the performances achieved by our mediatorless device are comparable or superior to those reported for analogous RC-based photoelectrochemical cells, in terms of both terbutryn sensing and photocurrent generation

Modification of Gold Electrodes with Bacterial Reaction Centres Immobilized by Laser Induced Forward Transfer (LIFT) Technique for Amperometric Herbicide Detection

Abstract The functionalization of screen-printed electrodes (SPEs) with a thin film of reaction centre (RC) proteins from the phototrophic bacterium Rhodobacter (R.) sphaeroides, by means of laser induced forward transfer (LIFT) technique, allowed the fabrication of robust and sensitive bio-hybrid devices for terbutryn detection and analysis. The optimal wiring between RCs and the gold electrode surface, achieved by LIFT, led to the generation of cathodic photocurrents sustained by a direct electron transfer (DET) mechanism, which were attenuated by addition of the herbicide inhibitor. (C) 2016 The Authors. Published by Elsevier Ltd

Terabit direct-detection optical engines and switchingcircuits in multi-chip modulesfor Data-center networks and the 5G optical fronthaul

Terabit capacity optical engines for data center and access networks are gaining momentum supported by a pool of technological innovations that are promising low cost and simple design for a wide range of application use cases

Mass spectrometric and laser spectroscopic characterization of a supersonic planar plasma expansion

-- A(3)Sigma(u)(+) electronic transition of molecular nitrogen. (C) 2003 Elsevier B.V. All rights reserved