期刊
PHYSICAL REVIEW LETTERS
卷 121, 期 26, 页码 -出版社
AMER PHYSICAL SOC
DOI: 10.1103/PhysRevLett.121.263901
关键词
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资金
- Swiss National Science Foundation [P300P2_177721]
- Vannevar Bush Faculty Fellowship [N00014-17-1-3030]
- U.S. Department of Defense
- MURI grant from the U.S. Air Force Office of Scientific Research [FA9550-17-1-0002]
- Swiss National Science Foundation (SNF) [P300P2_177721] Funding Source: Swiss National Science Foundation (SNF)
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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