A device including a waveguide, the waveguide having a first portion where energy having a wavelength, λ, enters and a second portion where the energy exits, the waveguide including a core layer with an index of refraction, n1; at least one cladding layer formed adjacent the core layer, the cladding layer having an index of refraction, n2; a reflective layer, the reflective layer positioned adjacent the first portion of the waveguide; and an interlayer, the interlayer positioned between the first portion of the waveguide and the reflective layer, the interlayer having an index of refraction, n3; wherein n3 is greater than n2.