Quasicrystal structure in metamaterials regime - Presentation.pdf · [5] Rybin et al., Nat....
Transcript of Quasicrystal structure in metamaterials regime - Presentation.pdf · [5] Rybin et al., Nat....
References[1] Li, Kivshar, Rybin, ACS Photonics (2018)[2] X. Huang et al., Nat. mat. 10, 582–586 (2011).[3] J.-W. Dong et al., PRL 114, 163901 (2015).
Ekaterina E. Maslova1, Mikhail V. Rybin1,2
Quasicrystal structure in metamaterials regime
1Department of Physics and Engineering, ITMO University, St Petersburg 197101, Russia
2Ioffe Institute, St. Petersburg 194021, Russia
Introduction Theory Penrose tilling Transmission Phase transition Conclusion
Typical band diagram for metamaterialsTypical band diagram for photonic crystal
Photonic phase transition
Periodic structures
Quasicrystal structures
Homogeneous mode is observedin the samples, which confirmsthe transition of the quasicrystalstructure to the metamaterialmode.Analyze homogeneous mode, weconstructed phase diagram.
Quasicrystal
Metamaterial
Penrose lattice
Band diagrams are not existingin quasicrystal structures andwe cannot see polaritonicfeature in the metamaterialregime.
Polaritonic feature
Introduction Theory
References[5] Rybin et al., Nat. Comm.(2015)
Photonic phase transition in periodic structures
References[4] Li, Kivshar, Rybin, ACS Photonics (2018)
Polaritonic feature
Ekaterina E. Maslova, Mikhail V. Rybin
Quasicrystal structure in metamaterials regime
Polaritonic feature is a criterion of metamaterials
Typical band diagram for metamaterials
Typical band diagram for photonic crystal
Filling ratio
Die
lect
ric
ind
ex
r/a - scenario
ε - scenario
Phase transition ConclusionPenrose tilling Transmission
Phase diagram “photonic crystal –metamaterial” for a square lattice ofdielectric cylinders. TE polarization. Thedielectric constant ε of variousmaterials is indicated by the horizontallines.
The first way to makemetamaterials is thedecreasing lattice constantand the second one is theincreasing dielectricpermittivity.
Structural factorPenrose tilling generate
Ekaterina E. Maslova, Mikhail V. Rybin
Quasicrystal structure in metamaterials regime
Introduction Theory Phase transition ConclusionPenrose tilling Transmission
Penrose lattice
Hexagonal lattice
Square lattice
Real space Reciprocal space
References[6] M. Chodyn et al., Acta Cryst. (2015). A71, 161–168
The projection ofunit cell of a 5Dhypercubic latticeinto 3D space inthe form of anicosahedron.
Penrose tilling
For quasicrystals maxima in the reciprocalspace become very dense including the areaaround the origin. As a result multipole Braggbands appear in the low frequency range.
Projection method toconstruct of one-dimensionalquasicrystals of theFibonacci type.
Transmission spectrum
Ekaterina E. Maslova, Mikhail V. Rybin
Quasicrystal structure in metamaterials regime
Introduction Theory Phase transition ConclusionPenrose tilling Transmission
Transmission spectra for (a) photonic crystal, (b) quasicrystal;metamaterials: (c) periodic structure, (d) quasicrystal structure.
Dependence of minimum of transmission on number of rods. The transportregime in a quasicrystal is not the same as in the periodic structure; therefore,the close arrangement of diffraction maxima does not prohibit the existenceof a metamaterial regime.
Photonic phase transitionHomogeneous mode
Ekaterina E. Maslova, Mikhail V. Rybin
Quasicrystal structure in metamaterials regime
Introduction Theory Phase transition ConclusionPenrose tilling Transmission
Photonic phase diagram for structure withPenrose lattice.
Distribution of field for structures with Penrose latticefor different values of parameter s.(a)-(c) photonic quasicrystals, (g)-(i) metamaterials.
(a)
ε = 12
ε = 50
ε = 100
1. The transport regime in a quasicrystal is not the same as in the periodic structures.2. The appearance of a homogeneous mode confirms the transition of the quasicrystal
structure to the metamaterial regime.3. We constructed phase diagram “quasicrystal - metamaterial”.
Ekaterina E. Maslova1, Mikhail V. Rybin1,2
Quasicrystal structure in metamaterials regime
1Department of Physics and Engineering, ITMO University, St Petersburg 197101, Russia
2Ioffe Institute, St. Petersburg 194021, Russia
Introduction Theory Penrose tilling Transmission Phase transition Conclusion