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We present the first observations of zero-n bandgaps in photonic crystalsuperlattices consisting of alternating stacks of negative index photoniccrystals and positive index dielectric materials in the near-infrared. Guidedby ab initio three-dimensional numerical simulations, the fabricatednanostructured superlattices demonstrate the presence of zero-order gaps inremarkable agreement with theoretical predictions across a range of differentsuperlattice periods and unit cell variations. These volume-averaged zero-indexsuperlattice structures present a new type of photonic band gap, with potentialfor complete wavefront control for arbitrary phase delay lines and open cavityresonances.

Observations of zero-order bandgaps in negative-index photonic crystal superlattices at the near-infrared