Direct Observation of a Localized Flat-Band State in a Mapped Moiré Hubbard Photonic Lattice

Lin, Huimin; Lü, Yanwu; Chang, Yi‐Jun; Yang, Yingyue; Jin, Xian

doi:10.1103/physrevapplied.18.054012

Cited by 2 publications

(3 citation statements)

References 53 publications

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“…There are emerging interests in using moiré physics to engineer optical dispersion. For example, moiré-patterned single-layer (1)(2)(3)(4)(5)(6)(7)(8)(9)(10)(11)(12)(13)(14)(15) and twisted-bilayer (16)(17)(18)(19)(20)(21)(22)(23)(24)(25)(26)(27)(28)(29)(30)(31)(32)(33)(34)(35) photonic structures exhibit ultraflat bands with no dispersion. The moiré pattern created by twisting two photonic structures relative to each other gives rise to distinctive optical properties, including nonlinear enhancement (36) and anisotropic dispersion (37).…”

Section: Introductionmentioning

confidence: 99%

Experimental probe of twist angle–dependent band structure of on-chip optical bilayer photonic crystal

Tang

Lou

et al. 2023

Sci. Adv.

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Recently, twisted bilayer photonic materials have been extensively used for creating and studying photonic tunability through interlayer couplings. While twisted bilayer photonic materials have been experimentally demonstrated in microwave regimes, a robust platform for experimentally measuring optical frequencies has been elusive. Here, we demonstrate the first on-chip optical twisted bilayer photonic crystal with twist angle–tunable dispersion and great simulation-experiment agreement. Our results reveal a highly tunable band structure of twisted bilayer photonic crystals due to moiré scattering. This work opens the door to realizing unconventional twisted bilayer properties and novel applications in optical frequency regimes.

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Section: Introductionmentioning

confidence: 99%

Experimental probe of twist angle–dependent band structure of on-chip optical bilayer photonic crystal

Tang

Lou

et al. 2023

Sci. Adv.

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“…With increasing moiré periods in length scale, the twistronics for electrons has been advanced to twisted metasurfaces [14][15][16] and twisted photonic crystals (PhCs) (twistoptics for photons) [17,18]. There are also flat-band modes and magic angles in twisted bilayer PhCs through the mode coupling between two twisted layers [19][20][21][22][23][24][25]. Moiré flat-band thresholdless lasing [22] in twistoptics is the optical analogy to superconductivity in twistronics.…”

Section: Introductionmentioning

confidence: 99%

“…Moiré PhCs can be twisted bilayers [8,18,20,21,23,24,[26][27][28][29][30][31][32][33][34][35][36][37][38] that can be ideally fabricated by E-beam lithography or a twisted single-layer moiré pattern [19,22,[39][40][41][42][43][44][45][46][47][48], which is formed by laser interference in photorefractive crystals, holographic lithography, or E-beam lithography. The single-layer moiré photonic lattice has been generated in a photorefractive crystal by a shallow modulation of the refractive index induced by two mutually twisted laser interferences.…”

Section: Introductionmentioning

confidence: 99%

Light Confinement in Twisted Single-Layer 2D+ Moiré Photonic Crystals and Bilayer Moiré Photonic Crystals

Kamau,

Hurley,

Kaul

et al. 2023

Photonics

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Twisted photonic crystals are photonic analogs of twisted monolayer materials such as graphene and their optical property studies are still in their infancy. This paper reports optical properties of twisted single-layer 2D+ moiré photonic crystals where there is a weak modulation in z direction, and bilayer moiré-overlapping-moiré photonic crystals. In weak-coupling bilayer moiré-overlapping-moiré photonic crystals, the light source is less localized with an increasing twist angle, similar to the results reported by the Harvard research group in References 37 and 38 on twisted bilayer photonic crystals, although there is a gradient pattern in the former case. In a strong-coupling case, however, the light source is tightly localized in AA-stacked region in bilayer PhCs with a large twist angle. For single-layer 2D+ moiré photonic crystals, the light source in Ex polarization can be localized and forms resonance modes when the single-layer 2D+ moiré photonic crystal is integrated on a glass substrate. This study leads to a potential application of 2D+ moiré photonic crystal in future on-chip optoelectronic integration.

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Direct Observation of a Localized Flat-Band State in a Mapped Moiré Hubbard Photonic Lattice

Cited by 2 publications

References 53 publications

Experimental probe of twist angle–dependent band structure of on-chip optical bilayer photonic crystal

Experimental probe of twist angle–dependent band structure of on-chip optical bilayer photonic crystal

Light Confinement in Twisted Single-Layer 2D+ Moiré Photonic Crystals and Bilayer Moiré Photonic Crystals

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