%0 Journal Article
%T Efficient light coupling into a photonic crystal waveguide with flatband slow mode
%+ Groupe d'étude des semiconducteurs (GES)
%A Saynatjoki, A.
%A Vynck, Kevin
%A Mulot, M.
%A Cassagne, David
%A Ahopelto, J.
%A Lipsanen, H.
%< avec comité de lecture
%Z 08-085
%@ 1569-4410
%J Photonics and Nanostructures - Fundamentals and Applications
%I Elsevier
%V 6
%P 127-133
%8 2008
%D 2008
%Z 0801.3259
%R 10.1016/j.photonics.2008.03.001
%K Guided waves
%K Integrated optics materials
%K Optical systems design
%K Waveguides
%K Photonic integrated circuits
%K Dispersion
%K Photonic crystals
%K RING-SHAPED HOLES
%K GROUP-VELOCITY
%K PROPAGATION
%Z Physics [physics]/Condensed Matter [cond-mat]/Materials Science [cond-mat.mtrl-sci]
%Z Physics [physics]/Physics [physics]/Optics [physics.optics]Journal articles
%X We design an efficient coupler to transmit light from a strip waveguide into the flatband slow mode of a photonic crystal waveguide with ring-shaped holes. The coupler is a section of a photonic crystal waveguide with a higher group velocity, obtained by different ring dimensions. We demonstrate coupling efficiency in excess of 95% over the 8 nm wavelength range where the photonic crystal waveguide exhibits a quasi-constant group velocity v(g) approximate to c/37 and observe a more than 12-fold intensity enhancement in the slow-light waveguide. An analysis based on the small Fabry-Perot resonances in the simulated transmission spectra is used for studying the effect of the coupler length and for evaluating the coupling efficiency in different parts of the coupler. The mode conversion efficiency within the coupler is more than 99.7% over the wavelength range of interest. The parasitic reflectance in the coupler, which depends on the propagation constant mismatch between the slow mode and the coupler mode, is lower than 0.6%. (c) 2008 Elsevier B.V. All rights reserved.
%G English
%L hal-00437952
%U https://hal.science/hal-00437952
%~ CNRS
%~ UNIV-MONTP2
%~ GES
%~ UNIV-MONTPELLIER
%~ UM1-UM2