|Título||Solid immersion lens at the aplanatic condition for enhancing the spectral bandwidth of a waveguide grating coupler
Pereira, Marcelo Barbalho
Craven, Jill S.
Mendes, Sergio Brito
|Abstract||We report a technique to substantially boost the spectral bandwidth of a conventional waveguide grating coupler by using a solid immersion cylindrical lens at the aplanatic condition to create a highly anamorphic beam and reach a much larger numerical aperture, thus enhancing the spectral bandwidth of a free-space propagating optical beam coupled into a single-mode planar integrated optical waveguide (IOW). Our experimental results show that the broadband IOW spectrometer thus created almost doubles (94% enhancement) the coupled spectral bandwidth of a conventional configuration. To exemplify the benefits made possible by the developed approach, we applied the technique to the broadband spectroscopic characterization of a protein submonolayer; our experimental data confirm the enhanced spectral bandwidth (around 380–nm) and illustrate the potentials of the developed technology. Besides the enhanced bandwidth, the broadband coupler of the single-mode IOW spectrometer described here is more robust and user-friendly than those previously reported in the literature and is expected to have an important impact on spectroscopic studies of surface-adsorbed molecular layers and surface phenomena.
|Contido em||Optical engineering. Redondo Beach. Vol. 49, no. 12 (Dec. 2010), 124601, 8 p.
[en] Beam-shaping optics
[en] Grating coupler
[en] Molecular films
[en] Optical spectroscopy
|Tipo||Artigo de periódico
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