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Optical Engineering

Solid immersion lens at the aplanatic condition for enhancing the spectral bandwidth of a waveguide grating coupler
Author(s): Marcelo B. Pereira; Jill S. Craven; Sergio B. Mendes
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Paper 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.

Paper Details

Date Published: 1 December 2010
PDF: 8 pages
Opt. Eng. 49(12) 124601 doi: 10.1117/1.3520063
Published in: Optical Engineering Volume 49, Issue 12
Show Author Affiliations
Marcelo B. Pereira, Univ. Federal do Rio Grande do Sul (Brazil)
Jill S. Craven, California Institute of Technology (United States)
Sergio B. Mendes, Univ. of Louisville (United States)

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