Fluorophore-doped xerogel antiresonant reflecting optical waveguides


AU: 
Llobera, A; Cadarso, VJ; Carregal-Romero, E; Brugger, J; Dominguez, C; Fernandez-Sanchez, C
SO: 
OPTICS EXPRESS
GTQ Authors: 

Research Lines:

VL: 
19
IS: 
6
BP: 
5026
EP: 
5039
PY: 
2011
SN: 
1094-4087
IF: 
3.75
Year IF: 
2010
Abstract: 

Rhodamine B and Alexa Fluor 430 fluorophores have been used as doping agents for xerogel waveguides defined over an antiresonant (ARROW) filter. This configuration has a significant level of integration, since it merges the waveguide, the light emitter and the filter in a single photonic element. Different technologies have been combined for their implementation, namely soft lithography, standard silicon-based technology and silicon bulk micromachining. The spectral response of 15-mm long waveguides without fluorophore is first analyzed as a function of the waveguide width. Here, it has been observed how the xerogel used has a high transparency in the visible spectra, having only significant absorption at the wavelength where the ARROW filter is in resonance. In a second step, identical waveguides but doped with two different concentrations of Rhodamine B and Alexa Fluor 430 are studied. In addition to the effect of the filter, fluorophore-doped xerogel waveguides show losses close to. 2 dB ( equivalent to 2 dB of light emission). In addition, it has been observed how an increase of the fluorophore concentration within the xerogel matrix does not provide with a emission increase, but saturation or even a decrease of this magnitude due to self-absorption. Finally, the total losses of the proposed waveguides are analyzed as a function of their width, obtaining losses close to 5 dB for waveguide widths higher than 50 mu m. 

DT: 
Article en revistes indexades
Percentil: 
HIGH
Percentil Year: 
2010
Category: 
OPTICS