Picosecond semiconductor switching devices

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Digital electric field induced switching of plasmonic nanorods using an electro-optic fluid fiber

We demonstrate the digital electric field induced switching of plasmonic nanorods between 1 and 0 orthogonal aligned states using an electro-optic fluid fiber component. We show by digitally switching the nanorods, that thermal rotational diffusion of the nanorods can be circumvented, demonstrating an approach to achieve submicrosecond switching times. We also show, from an initial unaligned state, that the nanorods can be aligned into the applied electric field direction in 110 nanoseconds. The high-speed digital switching of plasmonic nanorods integrated into an all-fiber optical component may provide novel opportunities for remote sensing and signaling applications

Twin-core fiber sensor integrated in laser cavity

In this work, we report on a twin-core fiber sensor system that provides improved spectral efficiency, allows for multiplexing and gives low level of crosstalk. Pieces of the referred strongly coupled multicore fiber are used as sensors in a laser cavity incorporating a pulsed semiconductor optical amplifier (SOA). Each sensor has its unique cavity length and can be addressed individually by electrically matching the periodic gating of the SOA to the sensor's cavity roundtrip time. The interrogator acts as a laser and provides a narrow spectrum with high signal-to-noise ratio. Furthermore, it allows distinguishing the response of individual sensors even in the case of overlapping spectra. Potentially, the number of interrogated sensors can be increased significantly, which is an appealing feature for multipoint sensing.This work was supported in part by the European Regional Development Fund, in part by the Ministerio de Economia y Competitividad under projects TEC2015-638263-C03-1-R and PGC2018-101997-B-I00, in part by Ministerio de Ciencia e Innovacion: under projects PID2021-122505OB-C31 and TED2021-129959B-C21, in part by the Gobierno Vasco/Eusko Jaurlaritza under projects IT1452-22 and ELKARTEK (KK 2021/00082 and KK 2021/00092), in part by the Swedish Science Council, Office of Naval Research Global (Award N62909-20-12033) and in part by Vinnova Innovair: Forskningsprojekt inom flygteknik (D.N. 2020-00187). The work of Josu Amorebieta is funded by a PhD fellowship from the University of the Basque Country UPV/EHU. The authors would like to thank Kenny Hey Tow, Erik Zetterlund and Fredrik Laurell for useful discussions and support

Hermetic All-Fiber Phase Modulators Using Joule Heating in Carbon-Coated Fibers

26ª edición del congreso internacional Optical Fiber Sensors (OFS26), 24/09/2018-28/09/2018, Lausanne, Suiza.Certain applications of fiber sensors (e.g. avionics, oil industry) imply extreme operating conditions spurring the development of hermetic all-fiber devices. We present a hermetic all-fiber phase modulator based on Joule heating in a carbon-coated fiber.European CommissionMinisterio de Economía y CompetitividadComunidad de Madri

Hermetic carbon coatings for electro-thermal all-fiber phase modulators

Joule effect and thermal response of several carbon-coated fibers are modelled and analysed. An electro-thermally driven all-fiber phase modulator based on these principles is proposed and a proof of concept of it is characterized. This kind of fibers could be the basis for developing all-fiber components aimed to operate in environments where the strength increase and impermeability to hydrogen diffusion guaranteed by the carbon coating is crucial.European CommissionMinisterio de Economía y CompetitividadComunidad de Madri

Pervasive transition of the Brazilian land-use system

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