Contra-directional coupling into slotted photonic crystals for spectrometric applications
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We propose and demonstrate the concept of a contra-directional coupler between a W1 and a slotted photonic crystal waveguide. The bandwidth and operating wavelength of such a coupler can be controlled via its geometrical parameters, and power transfer is not periodic unlike in the more familiar codirectional case. Light of specific wavelengths can be extracted from the W1 mode into air slot modes using this design, with W1/slot coupling efficiencies of up to 99 ± 1%, and waveguide extracted coupling efficiencies of up to 51 ± 12% demonstrated experimentally. Combining several of these couplers in series, we demonstrate the spectral filtering functionality on-chip. The device therefore combines the well-known sensing function of the slotted waveguide geometry with the spectrometer function, thus uniting two essential biosensor functions in a monolithic device.
Scullion , M G , Di Falco , A & Krauss , T F 2014 , ' Contra-directional coupling into slotted photonic crystals for spectrometric applications ' Optics Letters , vol 39 , no. 15 , pp. 4345-4348 . DOI: 10.1364/OL.39.004345
© 2014 Optical Society of America. This paper was published in Optics Express and is made available as an electronic reprint with the permission of OSA. The paper can be found at the following URL on the OSA website: http://www.opticsinfobase.org/ol/abstract.cfm?uri=ol-39-15-4345. Systematic or multiple reproduction or distribution to multiple locations via electronic or other means is prohibited and is subject to penalties under law.
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