Wide wavelength-tunable narrow-band thermal radiation from moiré patterns

Guo, Cheng; Guo, Yu; Lou, Beicheng

doi:10.1063/5.0047308

Cited by 27 publications

(13 citation statements)

References 40 publications

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“…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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Section: Resultsmentioning

confidence: 99%

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

et al. 2023

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“…The existence of a tunable guided resonance due to the Moire periodicity has been noted in previous work. 5,8 However, the existing work does not naturally lead to the design of a tunable filter. As an example, we consider a structure, as illustrated in Figure 2.…”

Section: ■ Results and Discussionmentioning

confidence: 99%

“…Inspired by the recent discoveries of novel electronic properties in twisted bilayer graphene, , there has been a surge of interest in twisted photonic structures consisting of a thin film on top of another. − One major attraction of these structures is that their optical properties can depend strongly on the in-plane twist angle between the films, which enables applications such as tunable circular dichroism, − tunable thermal emission, and tunable lens focus …”

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confidence: 99%

Tunable Frequency Filter Based on Twisted Bilayer Photonic Crystal Slabs

Lou

Fan

2022

ACS Photonics

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We introduce a tunable narrow-band-stop frequency filter based on twisted bilayer photonic crystal slabs. The operation of the filter is based on the guided resonance of the slabs. We choose to operate in a regime where the operating wavelength is significantly larger than the periodicity of the individual photonic crystal slabs, such that all the resonances in the operating frequency range arise from the Moire periodicity, and hence, their resonant frequencies are strongly dependent upon the twist angle. We also show that a desired notch filter line shape can be achieved by introducing additional uniform slabs and that the filter can operate without diffraction loss and is polarization-independent. Such a filter may be potentially important for communication and signal processing applications.

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“…Via photonic crystals, optimal designs for daytime radiative cooling have been achieved 26,89 . Furthermore, via nanostructuring and metamaterials both the angle 90,91 and the bandwidth of thermal emission has been tuned [92][93][94] . All these λ₁ T₁ T₂ λ₂ Emissivity FIG.…”

Section: Dynamical Tuning Mechanismsmentioning

confidence: 99%