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Journal Article

Influence of air-filling fraction on forward Raman-like scattering by transversely trapped acoustic resonances in photonic crystal fibers

MPS-Authors
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Brenn,  A.
Russell Division, Max Planck Institute for the Science of Light, Max Planck Society;
International Max Planck Research School, Max Planck Institute for the Science of Light, Max Planck Society;

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Kang,  M. S.
Russell Division, Max Planck Institute for the Science of Light, Max Planck Society;

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Hundertmark,  H.
Russell Division, Max Planck Institute for the Science of Light, Max Planck Society;

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Joly,  N.
Russell Division, Max Planck Institute for the Science of Light, Max Planck Society;

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Russell,  P. St. J.
Russell Division, Max Planck Institute for the Science of Light, Max Planck Society;

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Citation

Brenn, A., Wiederhecker, G. S., Kang, M. S., Hundertmark, H., Joly, N., & Russell, P. S. J. (2009). Influence of air-filling fraction on forward Raman-like scattering by transversely trapped acoustic resonances in photonic crystal fibers. JOURNAL OF THE OPTICAL SOCIETY OF AMERICA B-OPTICAL PHYSICS, 26(8), 1641-1648.


Cite as: https://hdl.handle.net/11858/00-001M-0000-002D-6BC1-E
Abstract
Raman-like forward scattering by acoustic phonons transversely trapped in birefringent silica-air photonic crystal fibers is studied. As the air-filling fraction increases, core-confined acoustic resonances become increasingly apparent at higher frequencies (> 1.1 GHz), while the number of cladding-confined acoustic modes involved in scattering falls. Two main types of scattering are observed: intramodal (scattering to new frequencies within the same optical mode) and intermodal (frequency-shifted scattering to a different optical mode). It is shown that the twofold symmetric microstructure in a birefringent fiber causes strongly polarization-dependent intramodal scattering. Good agreement is obtained between the experimental measurements and numerical solutions of both the acoustic and electromagnetic wave equations by using a full-vectorial finite-element approach. Phononic bandgaps are found to play a significant role at higher air-filling fractions, leading to the appearance of additional bands in the scattering spectrum. (C) 2009 Optical Society of America