We propose the V-groove waveguide as a novel silicon nanophotonic structure. By anisotropic etching of a
monocrystalline silicon layer, angled photonic wires with isosceles-trapezoidal cross section can be realized.
Placing two such wires side by side results in a waveguiding structure consisting of two highly coupled wires
separated by an acute angled V-shaped nano groove. By choosing proper geometry parameters, the light is
concentrated near the bottom of the groove. In this work, we theoretically study the dependence of the light
confinement characteristics on the waveguide geometry parameters and demonstrate the suitability of the Vgroove
waveguide as a versatile platform for surface sensing, for exploiting nonlinear optical effects in low index
materials, and for realizing nanowire lasers.