Band gaps and cavity modes in dual phononic and photonic strip waveguides

Yan Pennec (1) , Bahram Djafari-Rouhani (1) , C. Li (1) , J.M. Escalante (2) , Alejandro Martínez (2) , Sarah Benchabane (3) , Vincent Laude (3) , Nikos Papanikolaou (4)

1 IEMN - Institut d’Électronique, de Microélectronique et de Nanotechnologie - UMR 8520
2 NTC-UPV - Nanophotonics Technology Centre, Universidad Politecnica de Valencia
3 FEMTO-ST - Franche-Comté Électronique Mécanique, Thermique et Optique - Sciences et Technologies (UMR 6174)
4 IMEL - The Institute of Microelectronics, NCSR “Demokritos”

We discuss theoretically the simultaneous existence of phoxonic, i.e., dual phononic and photonic, band gaps in a periodic silicon strip waveguide. The unit-cell of this one-dimensional waveguide contains a hole in the middle and two symmetric stubs on the sides. Indeed, stubs and holes are respectively favorable for creating a phononic and a photonic band gap. Appropriate geometrical parameters allow us to obtain a complete phononic gap together with a photonic gap of a given polarization and symmetry. The insertion of a cavity inside the perfect structure provides simultaneous confinement of acoustic and optical waves suitable to enhance the phonon-photon interaction.

Domaines: Acoustique [physics.class-ph]; Acoustique [physics.class-ph]; Optique / photonique

Yan Pennec, Bahram Djafari-Rouhani, C. Li, J.M. Escalante, Alejandro Martínez, et al.. Band gaps and cavity modes in dual phononic and photonic strip waveguides. AIP Advances, 2011, 1 (4), pp.041901. ⟨10.1063/1.3675799⟩. ⟨hal-00759506⟩