Zero-Index Bound States in the Continuum

Metamaterials with an effective zero refractive index associated with their electromagnetic response are sought for a number of applications in communications and nonlinear optics. A promising way that this can be achieved in all-dielectric photonic crystals is through the design of a Dirac cone at...

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Veröffentlicht in:Physical review letters 2018-12, Vol.121 (26), p.263901-263901, Article 263901
Hauptverfasser: Minkov, Momchil, Williamson, Ian A D, Xiao, Meng, Fan, Shanhui
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container_title Physical review letters
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creator Minkov, Momchil
Williamson, Ian A D
Xiao, Meng
Fan, Shanhui
description Metamaterials with an effective zero refractive index associated with their electromagnetic response are sought for a number of applications in communications and nonlinear optics. A promising way that this can be achieved in all-dielectric photonic crystals is through the design of a Dirac cone at zero Bloch wave vector in the photonic band structure. In the optical frequency range, the natural way to implement this design is through the use of a photonic crystal slab. In the existing implementation, however, the zero-index photonic modes also radiate strongly into the environment due to intrinsic symmetry properties. This has resulted in large losses in recent experimental realizations of this zero-index paradigm. Here, we propose a photonic crystal slab with zero-index modes which are also symmetry-protected bound states in the continuum. Our approach thus eliminates the associated radiation loss. This could enable, for the first time, large-scale integration of zero-index materials in photonic devices.
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source American Physical Society Journals; EZB-FREE-00999 freely available EZB journals
subjects Bloch waves
Frequency ranges
Large scale integration
Metamaterials
Nonlinear optics
Optical frequency
Photonic crystals
Refractivity
Symmetry
title Zero-Index Bound States in the Continuum
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