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Authors: D. Néel, T. Benyattou, P. Sanchis, J. Martí, W. Bogaerts, P. Dumon, R. Baets
Title: Optical near-field study of photonic crystal tapers
Format: International Journal
Publication date: 10/2009
Journal/Conference/Book: Applied Optics
Volume(Issue): 48(30) p.5718-5721
Internal Reference: [N-941]
DOI:
Download: Download this Publication (561KB) (561KB)

Abstract

A scanning near-field optical microscopy study is undertaken on photonic crystal tapers. These tapers are used to couple a 3 ìm wide multimode dielectric waveguide to a single-line defect monomode photonic crystal waveguide. Two kinds of taper, with or without a localized defect, are compared. Higher transmission efficiency is obtained when a defect is utilized. The near-field study at 1550 nm shows experimentally that this defect prevents leaky resonant states to appear in the taper and thus permits a decrease in out-of plane losses. These observations are supported by band diagram calculations.

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