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12 June 2007 Optical gain in dye-doped polymer waveguides using oxidized porous silicon cladding
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We report on a novel organic/inorganic hybrid waveguide approach, which is composed of a cladding of extremely low refractive index oxidized porous silicon formed on a bulk silicon substrate and of it, a polymeric (polymethylmethacrylate) core doped with a visible laser dye (Nile-Blue) was deposited by spin coating. The waveguiding properties of the structures have been characterised by means of the m-line technique, demonstrating that the use of oxidized porous silicon as a cladding can considerably improve the mode confinement factor of single-mode waveguides. The low refractive index achievable in the cladding (n=1.16) allows forming waveguides with a low index polymer cores. Variable stripe length (VSL) measurements have been also performed in order to characterise the amplification properties of the waveguides. We demonstrate a clear transition from losses to gain at 694nm with a pump threshold of 28mJ/cm2. Values of net optical gain up to 104dB/cm have been measured at this wavelength.
© (2007) COPYRIGHT Society of Photo-Optical Instrumentation Engineers (SPIE). Downloading of the abstract is permitted for personal use only.
Daniel Navarro-Urrios, Mher Ghulinyan, Paolo Bettotti, Néstor Capuj, Claudio J. Oton, Fernando Lahoz, Inocencio R. Martin, and Lorenzo Pavesi "Optical gain in dye-doped polymer waveguides using oxidized porous silicon cladding", Proc. SPIE 6593, Photonic Materials, Devices, and Applications II, 659321 (12 June 2007); doi: 10.1117/12.721400;

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