Utilize este identificador para referenciar este registo: http://hdl.handle.net/10400.21/2218
Título: Multilayer Architectures Based on a-SiC:H Material: Tunable Wavelength Filters in Optical Processing Devices
Autor: Vieira, Maria Manuela Almeida Carvalho
Vieira, Manuel Augusto
Louro, Paula
Costa, João
Fernandes, Miguel
Fantoni, Alessandro
Barata, Manuel Martins
Palavras-chave: Multispectral structures
Optical transducer
Fluorescence resonance energy transfer detection
Electrical model
Data: Jun-2011
Editora: Amer Scientific Publishers
Citação: VIEIRA, M.; VIEIRA, M. A.; LOURO, P.; COSTA, J.; FERNANDES M.; FANTONI, A.; BARATA, M. - Multilayer Architectures Based on a-SiC:H Material: Tunable Wavelength Filters in Optical Processing Devices. Journal of Nanoscience and Nanotechnology. ISSN 1533-4880. Vol. 11, n.º 6 (2011) p. 5299-5304.
Resumo: The characteristics of tunable wavelength filters based on a-SiC:H multilayered stacked pin cells are studied both theoretically and experimentally. The optical transducers were produced by PECVD and tested for a proper fine tuning of the cyan and yellow fluorescent proteins emission. The active device consists of a p-i'(a-SiC:H)-n/p-i(a-Si:H)-n heterostructures sandwiched between two transparent contacts. Experimental data on spectral response analysis, current-voltage characteristics and color and transmission rate discrimination are reported. Cyan and yellow fluorescent input channels were transmitted together, each one with a specific transmission rate and different intensities. The multiplexed optical signal was analyzed by reading out, under positive and negative applied voltages, the generated photocurrents. Results show that the optimized optical transducer has the capability of combining the transient fluorescent signals onto a single output signal without losing any specificity (color and intensity). It acts as a voltage controlled optical filter: when the applied voltages are chosen appropriately the transducer can select separately the cyan and yellow channel emissions (wavelength and frequency) and also to quantify their relative intensities. A theoretical analysis supported by a numerical simulation is presented.
Peer review: yes
URI: http://hdl.handle.net/10400.21/2218
ISSN: 1533-4880
Aparece nas colecções:ISEL - Eng. Elect. Tel. Comp. - Artigos

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