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a-SiC:H Based Devices as Optical Demultiplexers

  • Paula Louro (a1), Manuela Vieira (a2), João Costa (a3), M. A. Vieira (a4), Miguel Fernandes (a5), Alessandro Fantoni (a6) and Manuel Barata (a7)...

Abstract

In this paper we present results on the use of a multilayered a-SiC:H heterostructure as a wavelength-division demultiplexing device (WDM) for the visible light spectrum. The WDM device is a glass/ITO/a-SiC:H (p-i-n)/ a-SiC:H(-p) /Si:H(-i)/SiC:H (-n)/ITO heterostructure in which the generated photocurrent at different values of the applied bias can be assigned to the different optical signals.

The device was characterized through spectral response measurements, under different electrical bias. Demonstration of the device functionality for WDM applications was done with three different input channels covering wavelengths within the visible range. The recovery of the input channels is explained using the photocurrent spectral dependence on the applied voltage. The influence of the optical power density was also analysed.

An electrical model, supported by a numerical simulation explains the device operation. Short range optical communications constitute the major application field, however other applications are also foreseen.

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References

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1 Bas, Michael, Fiber Optics Handbook, Fiber, Devices and Systems for Optical Communication, Chap, 13, Mc Graw-Hill, Inc. 2002.
2 Louro, P., Vieira, M., Vieira, M. A., Fernandes, M., Fantoni, A., Lavareda, G., Carvalho, C.N., Amorphous and Polycrystalline Thin-Film Silicon Science and Technology – 2009, MRS Proceedings Volume 1153.
3 Louro, P., Vieira, M., Vieira, M. A., Fernandes, M., Fantoni, A., Francisco, C., Barata, M., Physica E 41 (2009) 10821085.
4 Topic, M., Stiebig, H., Krause, M. and Wagner, H., Appl. Phys. Lett. 78 (2001), p. 2387
5 Vieira, M., Fantoni, A., Fernandes, M., Louro, P., Lavareda, G. and Carvalho, C.N., Thin Solid Films, 515, Issue 19, 2007, 75667570.
6 Vieira, M. A., Vieira, M., Fernandes, M., Fantoni, A., Louro, P., Barata, M., Amorphous and Polycrystalline Thin-Film Silicon Science and Technology – 2009, MRS Proceedings Volume 1153, A0803

Keywords

a-SiC:H Based Devices as Optical Demultiplexers

  • Paula Louro (a1), Manuela Vieira (a2), João Costa (a3), M. A. Vieira (a4), Miguel Fernandes (a5), Alessandro Fantoni (a6) and Manuel Barata (a7)...

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