Coupling light into a slow-light photonic-crystal waveguide from a free-space normally-incident beam

We present a coupler design allowing normally-incident light coupling from free-space into a monomode photonic crystal waveguide operating in the slow-light regime. Numerical three-dimensional calculations show that extraction efficiencies as high as 80% can be achieved for very large group indices...

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Bibliographic Details
Published in:Optics express 2013-07, Vol.21 (13), p.15144-15154
Main Authors: Hamel, P, Grinberg, P, Sauvan, C, Lalanne, P, Baron, A, Yacomotti, A M, Sagnes, I, Raineri, F, Bencheikh, K, Levenson, J A
Format: Article
Language:English
Subjects:
Engineering Sciences
Optics
Photonic
Physics
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Summary:We present a coupler design allowing normally-incident light coupling from free-space into a monomode photonic crystal waveguide operating in the slow-light regime. Numerical three-dimensional calculations show that extraction efficiencies as high as 80% can be achieved for very large group indices up to 100. We demonstrate experimentally the device feasibility by coupling and extracting light from a photonic crystal waveguide over a large group-index range (from 10 to 60). The measurements are in good agreement with theoretical predictions. We also study numerically the impact of various geometrical parameters on the coupler performances.
ISSN:1094-4087
1094-4087
DOI:10.1364/OE.21.015144