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We present a bi-waveguide paradigm composed of joined Positive-Index-MaterialPIM)/Negative-Index-Material (NIM) slabs, demonstrating ultra-slow lightpropagation stemming from the competing propagation disposition in the PIM andNIM regions. We report for the first time a mesoscopic extended electromagnetic(EM) enhancement covering regions of the order of the free space wavelength,enabled by the slow-light mode in our system. Our dynamic numerical results areconsistent with our developed theoretical model, predicting an EM energyaccumulation reminiscent of a charging capacitor. Our analysis reveals thatspatial compression is not a requirement to EM enhancement in slow-lightsystems and stresses on the merits of high coupling efficiency, strong temporalcompression, monomodality and modal index bandwidth, -all present in ourproposed paradigm. Furthermore, we show that the heterostructure waveguide modeis an extra-ordinary entity with a unique energy velocity, that is opposite tothe Poynting vector in one of the participant waveguides. We believe theseresults will inspire new slow-light platforms relevant to the collectiveharvesting of strong light-matter interactions.

Extended slow-light field enhancement in positive/negative-index heterostructures