Photonic crystal molecules: tailoring the coupling strength and sign - Archive ouverte HAL Access content directly
Journal Articles Optics Express Year : 2014

Photonic crystal molecules: tailoring the coupling strength and sign

(1) , (1) , (1) , (1) , (2) , (3) , (1) , (1)
1
2
3

Abstract

We demonstrate a large tuning of the coupling strength in Photonic Crystal molecules without changing the inter-cavity distance. The key element for the design is the "photonic barrier engineering", where the "potential barrier" is formed by the air-holes in between the two cavities. This consists in changing the hole radius of the central row in the barrier. As a result we show, both numerically and experimentally, that the wavelength splitting in two evanescently-coupled Photonic Crystal L3 cavities (three holes missing in the ΓK direction of the underlying triangular lattice) can be continuously controlled up to 5× the initial value upon ∼ 30% of hole-size modification in the barrier. Moreover, the sign of the splitting can be reversed in such a way that the fundamental mode can be either the symmetric or the anti-symmetric one without altering neither the cavity geometry nor the inter-cavity distance. Coupling sign inversion is explained in the framework of a Fabry-Perot model with underlying propagating Bloch modes in coupled W1 waveguides.
Fichier principal
Vignette du fichier
2014_OE_molecule_photonique.pdf (1.11 Mo) Télécharger le fichier
Origin : Publisher files allowed on an open archive
Loading...

Dates and versions

hal-00993238 , version 1 (21-05-2014)

Identifiers

Cite

S. Haddadi, Philippe Hamel, G. Beaudoin, Isabelle Sagnes, Christophe Sauvan, et al.. Photonic crystal molecules: tailoring the coupling strength and sign. Optics Express, 2014, 22 (10), pp.12359-12368. ⟨10.1364/OE.22.012359⟩. ⟨hal-00993238⟩
330 View
238 Download

Altmetric

Share

Gmail Facebook Twitter LinkedIn More