Abstract: An energy converter for converting multi-frequency radiant energy into electrical energy is disclosed, comprising a plurality of superposed lateral waveguides having photovoltaic energy transducers disposed within. The waveguide include charge collectors, which may be the cladding. A plurality of spectral refractors termed Continuous Resonant Trap Refractors (CRTR) are disposed within the lateral waveguides the refractors comprising a tapered core waveguide, the wider end of which defining an aperture, and the tapered core width decreasing in magnitude as a function of the depth. A cladding is disposed about the tapered core. The aperture of the tapered core is dimensioned to allow passage of radiant energy comprising at least two frequencies. The varying width of the tapered core will cause different frequencies to reach a state at which they will penetrate the cladding and be emitted from the spectral refractor sorted by depth, and be coupled to respective lateral waveguides and/or transducers.