Observation of Zeroth-Order Band Gaps in Negative-Refraction Photonic Crystal Superlattices at Near-Infrared Frequencies

Kocaman, Serdar
Panoiu, N. C.
McMillan, J. F.
Yu, M. B.
Osgood, R. M.
Kwong, D. L.
Wong, C. W.
We present the first observations of zero-n over bar band gaps in photonic crystal superlattices consisting of alternating stacks of negative-index photonic crystals and positive-index dielectric materials in the near-infrared range. Guided by ab initio three-dimensional numerical simulations, the fabricated nanostructured superlattices demonstrate the presence of zeroth-order gaps in remarkable agreement with theoretical predictions across a range of different superlattice periods and unit cell variations. These volume-averaged zero-index superlattice structures present a new type of photonic band gap, with the potential for complete wave front control for arbitrary phase delay lines and open cavity resonances.
Physical Review Letters


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We show that optical beams propagating in path-averaged zero-index photonic crystal superlattices can have zero phase delay. The nanofabricated superlattices consist of alternating stacks of negative index photonic crystals and positive index homogeneous dielectric media, where the phase differences corresponding to consecutive primary unit cells are measured with integrated Mach-Zehnder interferometers. These measurements demonstrate that at path-averaged zero-index frequencies the phase accumulation remai...
Citation Formats
S. Kocaman et al., “Observation of Zeroth-Order Band Gaps in Negative-Refraction Photonic Crystal Superlattices at Near-Infrared Frequencies,” Physical Review Letters, 2009, Accessed: 00, 2020. [Online]. Available: https://hdl.handle.net/11511/28375.