title: Simultaneous guidance of slow photons and slow acoustic phonons in silicon phoxonic crystal slabs.
abstract: We demonstrate theoretically that photons and acoustic phonons can be simultaneously guided and slowed down in specially designed nanostructures. Phoxonic crystal waveguides presenting simultaneous phononic and photonic band gaps were designed in perforated silicon membranes that can be conveniently obtained using silicon-on-insulator technology. Geometrical parameters for simultaneous photonic and phononic band gaps were first chosen for optical wavelengths around 1550 nm, based on the finite element analysis of a perfect phoxonic crystal of circular holes. A plain core waveguide was then defined, and simultaneous slow light and elastic guided modes were identified for some waveguide width. Joint guidance of light and elastic waves is predicted with group velocities as low as c/25 and 180 m/s, respectively.
authors.affiliation: Institut FEMTO-ST, Université de Franche-Comté, CNRS, Besançon, France. vincent.laude@femto-st.fr
authors.forename: Vincent
authors.initials: V
authors.lastname: Laude
authors.forename: Jean-Charles
authors.initials: JC
authors.lastname: Beugnot
authors.forename: Sarah
authors.initials: S
authors.lastname: Benchabane
authors.forename: Yan
authors.initials: Y
authors.lastname: Pennec
authors.forename: Bahram
authors.initials: B
authors.lastname: Djafari-Rouhani
authors.forename: Nikos
authors.initials: N
authors.lastname: Papanikolaou
authors.forename: Jose M
authors.initials: JM
authors.lastname: Escalante
authors.forename: Alejandro
authors.initials: A
authors.lastname: Martinez