Presentation Information
[9p-N221-8]Tight binding modeling for one-dimensional moiré bilayer photonic crystals
〇(DC)Stepan Maksimovich Trushin1, Takahiro Ito1, Shuma Ito1, Satoshi Iwamoto2, Yasutomo Ota1 (1.Keio Univ., 2.RCAST, Tokyo Univ.)
Keywords:
Moire,Photonic crystal,Tight Binding
Moiré photonic crystals (PhCs) exhibit a variety of intriguing phenomena, including flatband light localization [1]. One-dimensional (1D) moiré bilayer PhCs have been shown to support flatbands, whose properties can be effectively described by guided-wave-based continuum models [2]. Such models are useful in predicting bandwidth of the flatband modes and the emergence of magic distances. However, they may become inadequate when dealing with complex moiré structures with randomness, defects and discontinuity. In this work, we discuss a tight-binding (TB) model for computing the band structures of moiré bilayer PhCs and compare them with full electromagnetic simulations using the finite element method (FEM). The simple TB model captures bandwidth evolution of a flatband mode when varying the layer-to-layer distance, building a starting point to explore more complex moire PhCs.
[1] X. R. Mao, et al., Nat. Nanotechnol. 16, 1099 (2021)
[2] D. X. Nguyen, et al., Phys. Rev. Res. 4, L032031 (2022)
[1] X. R. Mao, et al., Nat. Nanotechnol. 16, 1099 (2021)
[2] D. X. Nguyen, et al., Phys. Rev. Res. 4, L032031 (2022)