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

Tang, Haoning; Lou, Beicheng; Du, Feng; Zhang, Mingjie; Ni, Xueqi; Xu, Wei; Jin, Rebekah; Fan, Shanhui; Mazur, Eric

doi:10.1126/sciadv.adh8498

Cited by 16 publications

(8 citation statements)

References 53 publications

(62 reference statements)

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“…Depending on the twist angle, the photonic moiré lattice exhibits different periodic or aperiodic structures. Our approach possesses several practical and technical advantages over other methods for producing period photonic lattices, such as computer holography [ 29 ], polygon excitation slits [ 40 ], moiré nanolithography [ 43 ] and optical bilayer photonic crystals [ 44 ]. Table 1 briefly compares the functionality and disadvantages of the proposed visualization techniques.…”

Section: Discussionmentioning

confidence: 99%

Manipulating the Generation of Photonic Moiré Lattices Using Plasmonic Metasurfaces

Mu,

Zhang,

et al. 2024

Nanomaterials

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The generation of moiré lattices by superimposing two identical sublattices at a specific twist angle has garnered significant attention owing to its potential applications, ranging from two-dimensional materials to manipulating light propagation. While macroscale moiré lattices have been widely studied, further developments in manipulating moiré lattices at the subwavelength scale would be crucial for miniaturizing and integrating platforms. Here, we propose a plasmonic metasurface design consisting of rotated nanoslits arranged within N + N′ round apertures for generating focused moiré lattices. By introducing a spin-dependent geometric phase through the rotated nanoslits, an overall lens and spiral phase can be achieved, allowing each individual set of round apertures to generate a periodic lattice in the focal plane. Superimposing two sets of N and N′ apertures at specific twist angles and varying phase differences allows for the superposition of two sublattices with different periods, leading to the formation of diverse moiré patterns. Our simulations and theoretical results demonstrate the feasibility of our proposed metasurface design. Due to their compactness and tunability, the utilization of metasurfaces in creating nanoscale photonic moiré lattices is anticipated to find extensive applications in integrated and on-chip optical systems.

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Section: Discussionmentioning

confidence: 99%

Manipulating the Generation of Photonic Moiré Lattices Using Plasmonic Metasurfaces

Mu,

Zhang,

et al. 2024

Nanomaterials

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“…8(c)]. Quasi-BICs in photonic quasicrystals and moiré photonic structures enrich the varieties of photonic systems for us to design and utilize generalized BICs [87,88] .…”

Section: Explored Effects Enabled By Bicsmentioning

confidence: 99%

Optical bound states in the continuum in periodic structures: mechanisms, effects, and applications

Wang,

Li,

Zhao

et al. 2024

Photonics Insights

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“…Moiré photonic crystals, inspired by moiré electronic systems like twisted bilayer graphene, − have recently garnered attention for their potential as novel, light-confining structures. − Consisting of two stacked photonic crystals separated by a subwavelength interlayer separation distance, moiré photonic crystal systems achieve flat photonic bands when the two photonic crystal layers are twisted at a so-called “magic” angle with respect to each other. As shown in Figure a, the bilayer moiré system can also be collapsed into a single photonic crystal layer, which we refer to as a “merged” moiré structure.…”

Section: Introductionmentioning

confidence: 99%

GaN Magic Angle Laser in a Merged Moiré Photonic Crystal

Raun,

Tang,

et al. 2023

ACS Photonics

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We demonstrate optically pumped blue lasing at room temperature in a merged moiré photonic crystal fabricated out of gallium nitride with embedded, fragmented quantum wells. Lasing occurs at two closely spaced wavelengths of 450 and 451 nm, matched to simulated flat bands induced by the moiré superlattice. Both thresholds occur at 30 μJ/cm2. Light in–light out curves were taken at both room temperature and 77 K across different gain materials, including fragmented quantum wells, continuous quantum wells, and quantum dots. Lasing was observed only at room temperature in fragmented quantum well devices, suggesting the importance of gain material carrier dynamics in unconventional laser cavities like the moiré design explored. These insights and the experimental validation of moiré simulations in a previously unexplored III–V material indicate promise toward a new kind of efficient, tunable laser.

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

Cited by 16 publications

References 53 publications

Manipulating the Generation of Photonic Moiré Lattices Using Plasmonic Metasurfaces

Manipulating the Generation of Photonic Moiré Lattices Using Plasmonic Metasurfaces

Optical bound states in the continuum in periodic structures: mechanisms, effects, and applications

GaN Magic Angle Laser in a Merged Moiré Photonic Crystal

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