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Low-Loss Zero-Index Materials
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DOI：10.1021/acs.nanolett.0c03575.png)
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Abstract
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Materials with a zero refractive index support electromagnetic modes that exhibit stationary phase profiles. While such materials have been realized across the visible and near-infrared spectral range, radiative and dissipative optical losses have hindered their development. We reduce losses in zero-index, on-chip photonic crystals by introducing high-Q resonances via resonance-trapped and symmetry-protected states. Using these approaches, we experimentally obtain quality factors of 2.6 x 10(3) and 7.8 x 10(3) at near-infrared wavelengths, corresponding to an order-of-magnitude reduction in propagation loss over previous designs. Our work presents a viable approach to fabricate zero-index on-chip nanophotonic devices with low-loss.
Keywords:
Zero-Index
photonic crystal
bound state in the continuum
integrated photonics
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