Contra-directional coupling into slotted photonic crystals for spectrometric applications

M.G. Scullion, A. Di Falco, T.F. Krauss

Research output: Contribution to journalArticlepeer-review

7 Citations (Scopus)
1 Downloads (Pure)


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.
Original languageEnglish
Pages (from-to)4345-4348
Number of pages4
JournalOptics Letters
Issue number15
Early online date18 Jul 2014
Publication statusPublished - 1 Aug 2014


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