Pereira, Marcelo B. and Craven, Jill S. and Mendes, Sergio B. (2010) Solid immersion lens at the aplanatic condition for enhancing the spectral bandwidth of a waveguide grating coupler. Optical Engineering, 49 (12). Art. No. 124601. ISSN 0091-3286 http://resolver.caltech.edu/CaltechAUTHORS:20110303-095334065
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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.
|Additional Information:||© 2010 Society of Photo-Optical Instrumentation Engineers. Paper 100554R received Jul. 8, 2010; revised manuscript received Oct. 13, 2010; accepted for publication Oct. 15, 2010; published online Dec. 7, 2010. This project was funded by the NIH (award RR022864 to S.B.M.) and the NSF (award DBI-0352449 to S.B.M.).|
|Subject Keywords:||micro-optics; beam-shaping optics; grating coupler; biophotonics; optical spectroscopy; molecular films|
|Classification Code:||PACS: 42.82.Et; 42.79.Gn; 42.79.Bh; 42.79.Dj; 87.64.km; 87.64.Cc|
|Official Citation:||Marcelo B. Pereira, Jill S. Craven and Sergio B. Mendes, "Solid immersion lens at the aplanatic condition for enhancing the spectral bandwidth of a waveguide grating coupler", Opt. Eng. 49, 124601 (Dec 07, 2010); doi:10.1117/1.3520063|
|Usage Policy:||No commercial reproduction, distribution, display or performance rights in this work are provided.|
|Deposited By:||Ruth Sustaita|
|Deposited On:||03 Mar 2011 22:18|
|Last Modified:||26 Dec 2012 12:59|
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