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Characterization of line-defect-waveguide lasers in two-dimensional photonic-crystal slabs

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3 Author(s)
Sugitatsu, Atsushi ; Department of Electronic Science and Engineering, Kyoto University, Kyoto-Daigaku Katsura, Nishikyoku, Kyoto 615-8510, Japan and Information Technology R&D Center, Mitsubishi Electric Corporation, 4-1 Mizuhara, Itami, Hyogo 664-8641, Japan ; Asano, T. ; Noda, S.

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Here we investigate a line-defect-waveguide laser in a two-dimensional photonic-crystal slab. The change δλ in lasing wavelength for a change δW in waveguide width is found to be extremely large: δλ/δW=2. It is two orders of magnitude greater than that for a conventional distributed-feedback laser. An investigation of the electromagnetic-field distribution at the waveguide-mode edge is made, giving an indication of the cavity-mode structure for lasing oscillation. Fourier transform analysis reveals that the extremely large tunability originates from the “zigzag” mode behavior of the line-defect waveguide in the photonic crystal, due to two-dimensional distributed feedback and reflection.

Published in:

Applied Physics Letters  (Volume:84 ,  Issue: 26 )