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Low-loss transmission band in photonic crystal waveguides with sharp cutoff at a frequency below the bandgap

Authors:	Asger Christian Krüger Min Zhang Radu Malureanu

Institution:	^a Interdisciplinary Nanoscience Center, Aarhus University, Ny Munkegade 120, DK-8000 Aarhus C, Denmark ^b Plasmonics and Metamaterials group, Department of Photonics Engineering, Technical University of Denmark, Ørsteds Plads, DK-2800 Kgs. Lyngby, Denmark ^c Aarhus School of Engineering and Department of Physics and Astronomy, Aarhus University, Ny Munkegade 120, DK-8000 Aarhus C, Denmark

Abstract:	We present TE transmission measurements of photonic crystal waveguides with high hole radius to period ratio r/Λ = 0.388. This geometry introduces a unique low loss transmission band in addition to the traditional PhC guiding band and very sharp transmission edges for devices with a length of 50 μm or longer. Finite difference time domain and plane wave expansion simulations confirm the results and show that the sharpness of the cutoffs can be explained by the spectral shape of the guiding mode in the band diagram.

Keywords:	Integrated optics devices Photonic crystals Planar waveguides Nanophotonics Low loss transmission
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