Tunable guided resonance in twisted bilayer photonic crystal

Lou, Beicheng; Wang, Benjamin; Rodríguez, Jesse A.; Cappelli, Mark A.; Fan, Shanhui

doi:10.1126/sciadv.add4339

Cited by 24 publications

(6 citation statements)

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“…Resonances in TBPhC are typically a mixture of angle-independent and angle-dependent resonances. The angle-dependent resonances are strongly associated with the moiré wave vector G m and therefore the twist angle ( 16 , 41 ). In Fig.…”

Section: Resultsmentioning

confidence: 99%

“…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%

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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: Resultsmentioning

confidence: 99%

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.

Self Cite

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show abstract

“…For example, our optimization process can be applied with 3D finite-difference frequency-domain method or finite element methods as well. Other switching mechanisms, such as phase-change materials, − and other types of tunable photonic devices − could also be considered.…”

Section: Resultsmentioning

confidence: 99%

Inverse Design of Optical Switch Based on Bilevel Optimization Inspired by Meta-Learning

et al. 2023

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We introduce the concept of meta-learning into the design of active optical switches. An optical switch consists of both tunable and nontunable elements. It has been difficult to apply conventional inverse design methods to optical switches, since the optimal choice of the tunable elements depends on the design of the nontunable elements. Here we show that a bilevel optimization scheme, closely related to the concept of meta-learning, can be used for the design of active optical switches. In this scheme, the inner and outer loops correspond to the optimization of the tunable and nontunable elements, respectively. We illustrate this scheme with two designs of optical switches based on different tuning mechanisms. This approach is generally applicable for the design of optical switches as well as other active and tunable optical devices.

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“…Optical encryption provides a promising route for information security owing to the unique advantages of satisfactory flexibility introduced by multiple regulable physical characteristics of light. [6] Micro/nanostructured functional surfaces, such as photonic crystals, [7][8][9][10][11] surface plasmon, [12] metasurfaces, [13,14] have powerful light manipulation ability by altering the amplitude, [15,16] phase, [17][18][19][20] polarization, [21] and hybrid parameters [22][23][24] of light, which are well-suited for the field of optical encryption. Owing to the advantages of compact size, low power consumption, and inherent difficulty in replication, micro/nanostructured functional surface-based optical devices are highly desirable for a variety of uses, such as metalens, [25,26] anticounterfeit tags, [27] visible camouflage.…”

Section: Introductionmentioning

confidence: 99%

Dynamic Optical Encryption Fueled via Tunable Mechanical Composite Micrograting Systems

Xin,

Hu,

Yin

et al. 2024

Advanced Materials

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Optical grating devices based on micro/nanostructured functional surfaces are widely employed to precisely manipulate light propagation, which is significant for information technologies, optical data storage, and light sensors. However, the parameters of rigid periodic structures are difficult to tune after manufacturing, which seriously limits their capacity for in situ light manipulation. Here, a novel anti‐eavesdropping, anti‐damage, and anti‐tamper dynamic optical encryption strategy are reported via tunable mechanical composite wrinkle micrograting encryption systems (MCWGES). By mechanically composing multiple in‐situ tunable ordered wrinkle gratings, the dynamic keys with large space capacity are generated to obtain encrypted diffraction patterns, which can provide a higher level of security for the encrypted systems. Furthermore, a multiple grating cone diffraction model is proposed to reveal the dynamic optical encryption principle of MCWGES. Optical encryption communication using dynamic keys has the effect of preventing eavesdropping, damage, and tampering. This dynamic encryption method based on optical manipulation of wrinkle grating demonstrates the potential applications of micro/nanostructured functional surfaces in the field of information security.

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Tunable guided resonance in twisted bilayer photonic crystal

Cited by 24 publications

References 50 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

Inverse Design of Optical Switch Based on Bilevel Optimization Inspired by Meta-Learning

Dynamic Optical Encryption Fueled via Tunable Mechanical Composite Micrograting Systems

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