Logic functions based on optical bias controlled SiC tandem devices

V. Silva, M. Vieira, M. A. Vieira, P. Louro, Alessandro Fantoni, M. Barata

Research output: Contribution to journalArticlepeer-review

3 Citations (Scopus)


The purpose of this paper is the design of an optoelectronic circuit based on a-SiC technology, able to act simultaneously as a 4-bit binary encoder or a binary decoder in a 4-to-16 line configurations and show multiplexer-based logical functions. The device consists of a p-i'(a-SiC:H)-n/p-i(a-Si:H)-n multilayered structure produced by PECVD. To analyze it under information-modulated wave (color channels) and uniform irradiation (background) four monochromatic pulsed lights (input channels): red, green, blue and violet shine on the device. Steady state optical bias was superimposed separately from the front and the back sides, and the generated photocurrent was measured. Results show that the devices, under appropriate optical bias, act as reconfigurable active filters that allow optical switching and optoelectronic logic functions development providing the possibility for selective removal of useless wavelengths. The logic functions needed to construct any other complex logic functions are the NOT, and both or either an AND or an OR. Any other complex logic function that might be found can also be used as building blocks to achieve the functions needed for the retrieval of channels within the WDM communication link.

Original languageEnglish
Pages (from-to)211-216
Number of pages6
JournalPhysica Status Solidi (C) Current Topics In Solid State Physics
Issue number2
Publication statusPublished - Feb 2014


  • A-SiC sensor
  • Digital light signals
  • Logical functions
  • Optoelectronics

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