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Vol. 185, Issue 2, February 2015, pp. 78-83




UV-VIS-NIR Communication with a-SiC:H Tandem Device

* Vitor Silva, Paula Louro, Manuel A. Vieira, Isabel Rodrigues, Manuela Vieira

Electronics Telecommunication and Computer Department ISEL – Instituto Superior de Engenharia de Lisboa, Lisboa, Portugal CTS-UNINOVA,
UNL - Universidade Nova de Lisboa, Caparica, Portugal
*E-mail: vsilva@deetc.isel.ipl.pt



Received: 14 November 2014 /Accepted: 15 January 2015 /Published: 28 February 2015

Digital Sensors and Sensor Sysstems


Abstract: Ultra-violet steady state illumination increases the spectral sensitivity of a pi’npin photodiode. Increased sensitivity in the range of 400-850 nm is experimentally demonstrated. The pi’npin photodiode can be illuminated on both back and front sides. Under front ultra-violet irradiation the gain is high for wavelengths in the 500-850 nm range and strongly quenches the 400-500 nm range. Under back ultra-violet irradiation the gain is high in the 400-500 nm range and strongly quenches for wavelengths in the 500-850 nm range. Using back or front illumination and the relative gain of each wavelength in the 400-850 nm range it is possible to select different wavelength channels. Results show that using different communication channels in the ultra-violet, visible and near infrared ranges the sensor exhibits a multiplexed output of all channels. By selectively illuminating the device with ultra- violet on the back or front sides of the device it enables the demultiplexing retrieval of all channels.


Keywords: Ultra-Violet, UV, Visible, Near Infrared, NIR, Visible Light Communication, SiC technology.


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