Tailoring the Local Density of Optical States and Directionality of Light Emission by Symmetry Breaking

Cueff, Sébastien; Dubois, Florian; Huang, Matthew Shao Ran; Li, Dongfang; Zia, Rashid; Letartre, Xavier; Viktorovitch, Pierre; Nguyen, Hai Son

doi:10.1109/jstqe.2019.2902915

Cited by 17 publications

(10 citation statements)

References 36 publications

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“…For a silicon metasurface on an insulator substrate, we choose a gap perturbation as shown in Figure 2A and consider the perturbation strength δ to be the difference in the widths of adjacent gaps. The structure supports a flat band ( Figure 2B) due to mode hybridization as a result of out-of-plane symmetry breaking by the substrate [32]. The electric-field mode profile ( Figure 2A) for excitation polarized parallel to the fingers has a good overlap with the silicon fingers.…”

Section: Free-space Thermo-optic Modulatorsmentioning

confidence: 68%

Active nonlocal metasurfaces

et al. 2020

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Actively tunable and reconfigurable wavefront shaping by optical metasurfaces poses a significant technical challenge often requiring unconventional materials engineering and nanofabrication. Most wavefront-shaping metasurfaces can be considered “local” in that their operation depends on the responses of individual meta-units. In contrast, “nonlocal” metasurfaces function based on the modes supported by many adjacent meta-units, resulting in sharp spectral features but typically no spatial control of the outgoing wavefront. Recently, nonlocal metasurfaces based on quasi-bound states in the continuum have been shown to produce designer wavefronts only across the narrow bandwidth of the supported Fano resonance. Here, we leverage the enhanced light-matter interactions associated with sharp Fano resonances to explore the active modulation of optical spectra and wavefronts by refractive-index tuning and mechanical stretching. We experimentally demonstrate proof-of-principle thermo-optically tuned nonlocal metasurfaces made of silicon and numerically demonstrate nonlocal metasurfaces that thermo-optically switch between distinct wavefront shapes. This meta-optics platform for thermally reconfigurable wavefront shaping requires neither unusual materials and fabrication nor active control of individual meta-units.

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Section: Free-space Thermo-optic Modulatorsmentioning

confidence: 68%

Active nonlocal metasurfaces

et al. 2020

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“…2(a-e). Moreover, the photonic bandstructure can be engineered on-demand within the spectral region of interest to exhibit various characteristics such as slow-light and linear dispersion [20], or even peculiar ones such as flatband, Dirac cones and multivalley characteristics [21], [22].…”

Section: Metasurface Halide Perovskite Ledmentioning

confidence: 99%

Multiscale Simulation for Visible Light Communication using Perovskite Metasurface

Mermet-Lyaudoz

Combeau

Drouard

et al. 2021

2021 17th International Symposium on Wireless Communication Systems (ISWCS)

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This article presents an original multi-scale simulation approach, enabling to rigorously compute the far-field radiation from emerging halide perovskite light-emitting diodes integrating a metasurface active layer, and subsequently to evaluate its impact on the propagation channel characteristics at the scale of an indoor environment, both in terms of coverage and time dispersion. Our results show that the high versatility of the metasurface design parameters allows the outage probability to be divided up to a factor 2 without degrading the temporal dispersion of the optical channel in visible light communication scenarios.

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“…This implantation process can be carried out in many different CMOS-compatible platforms such as thermal SiO 2 on silicon substrate and results in a flat surface that does not require any complex postprocess step such as CMP to planarize the device. A next logical step is to integrate nanophotonic devices on top of this metamaterial for a wealth of tunable functionalities such as an active control of spontaneous light emission [9,52,57] or dynamically tunable Huygen's metasurfaces [58].…”

Section: -8mentioning

confidence: 99%

Multipolar Resonances with Designer Tunability Using VO2 Phase-Change Materials

et al. 2020

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Subwavelength nanoparticles can support electromagnetic resonances with distinct features depending on their size, shape, and nature. For example, electric and magnetic Mie resonances occur in dielectric particles, while plasmonic resonances appear in metals. Here, we experimentally demonstrate that the multipolar resonances hosted by VO 2 nanocrystals can be dynamically tuned and switched thanks to the insulator-to-metal transition of VO 2 . Using both Mie theory and Maxwell-Garnett effective-medium theory, we retrieve the complex refractive index of the effective medium composed of a slab of VO 2 nanospheres embedded in SiO 2 and show that such a resulting metamaterial presents distinct optical tunability compared to unpatterned VO 2 . We further show that this approach provides a new degree of freedom to design low-loss phase-change metamaterials with record large figure of merit ( n/ k) and designer optical tunability.

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Tailoring the Local Density of Optical States and Directionality of Light Emission by Symmetry Breaking

Cited by 17 publications

References 36 publications

Active nonlocal metasurfaces

Active nonlocal metasurfaces

Multiscale Simulation for Visible Light Communication using Perovskite Metasurface

Multipolar Resonances with Designer Tunability Using VO2 Phase-Change Materials

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