We present a new approach to planar photonic interconnects based on spatial adiabatic passage between thin ridge silicon waveguides. Our approach provides robust coupling between arbitrary pairs of well-separated waveguides across a single chip, potentially bypassing intermediate waveguides and structures. This new technique presents opportunities for waveguide routing and device topologies that cannot be achieved using traditional evanescent coupling, while remaining compatible with conventional CMOS fabrication techniques.
This paper reports on the conceptual design and simulation of a new hybrid coupled plasmon/dielectric waveguide
device which may present opportunities for biosensing. The operation of the device is based on the phase matching
of wave propagation in the dielectric waveguide with that of the surface plasmons. Finite element method (FEM)
and eigenmode expansion (EME) methods have been utilised to analyse the characteristics of propagation of
these waves. A suitable periodic grating structure has been implemented to provide wavelength dependent phase
matching between the dielectric and plasmon modes. The selectivity of plasmon coupling makes it an ideal
technology to be utilised for sensing. Such a device may be fabricated as a low cost, highly sensitive, integratable
sensor allowing the detection of finite environmental changes including the presence of single layers of molecules.