Vol 48, No 18, 30 August 2012

  • A silicon-on-insulator chip being tested.

    Down to the wire

    Silicon photonics becomes more flexible with the first monolithic photodetectors that can be used with wire waveguides.

  • MIXSEL-team at the laser setup with diagnostics in the VECSEL-lab at ETH Zurich. (From left to right: Dr. M.Hoffmann, O. D. Sieber, V. J. Wittwer, Dr. M. Golling, M. Mangold and Prof. U. Keller; missing Prof. T. Südmeyer)

    Mixed pulses

    Simple MIXSELs can produce record powers in picosecond pulses.

  • Chris Baker and Graeme Smith

    Interview with Chris Baker and Graeme Smith

    Professor Chris Baker and Dr Graeme Smith from The Ohio State University in the US talk about the research behind their Letter Echoic flow for radar and sonar.

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Neural transistors
Researchers in Japan have succeeded in controlling neural signal propagation in neurons using three electrodes analogous to a transistor in a conventional electronic device. If neural signals can be controlled completely, neural electronic devices will be able to manage local pain within the human body.

Bright talk
The performances of communication and illumination have been considered simultaneously in visible light communication systems by researchers in Korea. They have shown a balance dimming range to obtain reasonable performance for indoor wireless communication systems.

Red shifts
Using red-shifted solitons as a pump field, researchers in China have generated the second and third harmonics simultaneously for the first time in a photonic crystal fibre.  The build-up of the second and third harmonics in relation to the spectral evolution of the soliton pump field makes PCFs an effective source of short wavelength radiation.

Deformation detection
Researchers in China have presented the first use of multi-wavelength coherent detection in Brillouin optical fibre sensing fields. The device can be used to simultaneously measure temperature and strain along sensing optical fibres, for example to detect deformations or diagnose problems in large-scale structures such as buildings, tunnels and oil pipes.

Displaying gain
Researchers in the US have designed the first heterojunction bipolar transistors with hydrogenated amorphous silicon contacts on crystalline silicon substrates. The current gain of the devices is very high, demonstrating the promise of these devices as current source/drivers for various applications, such as VLSI bipolar transistor devices and organic light-emitting diodes in active matrix displays.

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