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Photonic crystal structure for mode conversion



Statut des brevets

French patent application FR0115057 filed on November 21st, 2001


Philippe LALANNE

Statut commercial

Exclusive or non-exclusive licence Collaborative research


Laboratoire de Photonique et de Nanostructures, a CNRS laboratory (UPR 20) in Marcoussis, France.



The proposed photonic crystal mode converter is a guided structure that converts the optical mode of a PhC waveguide of any width to the mode of a larger or smaller guide, still operating on the fundamental mode. Within the periodic environment of holes of a photonic crystal matrix, it consists of a PhC waveguide section were the hole size and depth of the inner row of holes vary gradually. This variation synthesizes an artificial material with a gradient effective index.
This modal converter can be implemented in photonic integrated circuits.


The mode converter design provides an adiabatic modal conversion between two building blocks of a photonic-crystal based photonic integrated circuit.


Integration of Photonic Crystal sections within photonic integrated circuits.

Fig. 1. Photographs of the taper. Left, center, u _ 0.29:
(a) top view, (b) cross view. Right, u _ 0.24: (c) top view


Related publications

Talneau, M. Agio, C. M. Soukoulis, M. Mulot, S. Anand and Ph. Lalanne, « High-bandwidth transmission of an efficient photonic-crystal mode converter », OPTICS LETTERS, Vol. 29, No. 15, August 1, 2004, pp 1745-1747

A. Talneau, Ph. Lalanne, M. Agio, C. M. Soukoulis, « Low-reflection photonic-crystal taper for efficient coupling between guide sections of arbitrary widths », OPTICS LETTERS , Vol. 27, No. 17, September 1, 2002, 1522-1524

For further information, please contact us (Ref 85111-01)


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