Band-edge-induced Bragg diffraction in two-dimensional photonic crystals.
Two-dimensional photonic crystals composed of two orthogonal volume diffraction gratings have been photogenerated in photopolymers. When the read beam is set at the Bragg angle, the diffraction efficiency of the transmission grating is strongly enhanced at the band edge of the reflection grating recorded in the material. Such a device provides Bragg operation and enhancement of the diffraction efficiency of the thin diffraction grating together with good wavelength selectivity. Such advantages could be interesting for optical signal processing.
He
Qiong
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LTCI-CNRS, Telecom-Paris-GET, Paris Cedex, France.
Zaquine
Isabelle
I
Maruani
Alain
A
Massenot
Sébastien
S
Chevallier
Raymond
R
Frey
Robert
R