Dresden 2020 – wissenschaftliches Programm

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DS: Fachverband Dünne Schichten

DS 40: Thin Film Properties: Structure, Morphology and Composition I

DS 40.6: Vortrag

Donnerstag, 19. März 2020, 16:15–16:30, CHE 89

Band Engineering in Photonic Crystals with multi-order Square Lattice — •Chen jiaxu — Harbin Engineering University, Harbin, China

2D Photonic crystals (PCs) can be artificially arranged as periodic arrays to arise interesting optical characteristics, because of their intrinsic photonic band structures that are obviously determined by the lattice parameters. Therefore, the idea of band engineering can be realized by nanofabrication and provides an effective way to control the optical performance. However, most studies focus on band engineering by embedding elements at high symmetry points (Γ, X, M) of Brillouin zone in reciprocal-space, systemic studies along the path (Δ, Σ, Z) between symmetry points are still lacking. Here, 2D PCs with square lattice are engineered into muti-order lattices by carefully embed with other periodic elements at specific positions that correspond embedding lattice sites at non-high-symmetry points of Brillouin zone. This work proves non-high-symmetry point embedding is also an approach for photonic band engineering in photonic crystals as well as high-symmetry point and it is an effective way to modulate the photonic performances. As a result, the engineered photonic bands of PCs exhibit Dirac-like conical dispersions and flat band structure.