Related by context. Frequent words. (Click for all words.) 58 pentagonal 55 irregular shapes 55 ellipsoid 55 geometric pattern 55 photonic crystal 54 ellipse 54 geometrical shapes 54 rectangular 54 micrometre 54 cylindrical 54 torus 54 ovoid 53 boomerang shaped 53 alternating layers 53 hexagonal 53 concentric rings 52 rectangular shaped 52 gridded 52 conical 52 diffracted 52 stacked vertically 52 geodesic 51 spherical 51 toroidal 51 pentagons 51 collimated 51 trapezoid shaped 51 octagonal 50 curvilinear 50 isotropic 50 micrometres 50 geometric 50 chamfered 50 lattice 50 lobed 50 tetrahedral 50 cuboid 50 optical lattice 50 irregularly shaped 50 cruciform 50 microlenses 50 geometric forms 50 lattices 50 parallelogram 49 dipoles 49 silicon atoms 49 hexagons 49 z axis 49 millimeter diameter 49 orbitals 49 hexagon 49 exciton 49 nanometers nm 49 vertically aligned 49 conical shape 49 wavelike 49 hourglass shaped 49 geometrical 49 Fig. 1A 48 diffractive 48 triangular shaped 48 microstructures 48 abstract shapes 48 gently curved 48 curved 48 rectilinear 48 supramolecular 48 gently curving 48 anisotropic 48 elliptical 48 Euclidean 48 vertically stacked 48 oblong shaped 48 perpendicularly 48 radii 48 rectangle 48 stalactite 48 curvatures 48 evenly spaced 48 galaxy NGC 48 concentric 47 nanoribbons 47 teardrop shape 47 octagon shaped 47 membranous 47 cigar shaped 47 pediments 47 latticed 47 mullions 47 whorl 47 marbleized 47 curved surfaces 47 graphitic 47 cantilevers 47 whorls 47 oblong 47 crescent shaped 47 diametre 47 perfectly symmetrical 47 geometry 47 beam splitter