The impact of loss on high-<mml:math xmlns:mml="http://www.w3.org/1998/Math/MathML" altimg="si22.svg"><mml:mi>Q</mml:mi></mml:math> resonant metasurfaces: A case study for heated a-Si:H

Barreda, Ángela; Kuppadakkath, Athira; Ghazaryan, Lilit; Gan, Ziyang; Koshelev, Kirill; Bucher, Tobias; Pertsch, Thomas; George, Antony; Turchanin, Andrey; Szeghalmi, Adriana; Kivshar, Yuri S.; Choi, Duk‐Yong; Staude, Isabelle; Eilenberger, Falk

doi:10.1016/j.jqsrt.2022.108348

Cited by 9 publications

(8 citation statements)

References 66 publications

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“…Figure 3b shows the transmission spectra measured from the selected metasurface at different conditions, which are explained as follows. TiO 2 is expected to be more resistant to heat-induced changes than a-Si:H. 15,30 To test the response of the metasurface functionality to high temperature, it was annealed at 770 • C for 3 hours. These conditions were chosen to reflect the potential conditions of a CVD growth process of two-dimensional transition metal dichalcogenides.…”

Section: Resultsmentioning

confidence: 99%

“…This reduction is much less compared to the case of a-Si:H metasurface. 15,30 A buffer layer between the TMD, and the substrate was found to be helpful to avoid substrate effects in prior works. 31 Therefore, the TiO 2 metasurface was coated with a thin layer (10 nm) of Al 2 O 3 using atomic layer deposition process.…”

Section: Resultsmentioning

confidence: 99%

“…The high Q-factor makes them suitable for various applications in imaging, 3,4 sensing, 5,6 nonlinear optics, [7][8][9] lasing, 10 and many others. [11][12][13][14][15][16] Here we investigate the excitation of quasi-BIC resonances in TiO 2 metasurface for the photoluminescence (PL) emission enhancement of two-dimensional Molybdenum diselenide (MoSe 2 ). MoSe 2 is an indirect semiconductor in its bulk form.…”

Section: Introductionmentioning

confidence: 99%

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Quasi-BIC resonance in TiO2 metasurface for emission enhancement of two-dimensional material

Kuppadakkath,

Barreda,

Yang

et al. 2024

Photonic and Phononic Properties of Engineered Nanostructures XIV

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Bound states in the continuum (BICs) are a category of localized states that exist within the continuum of radiating modes. The high Q-factor exhibited by these states makes quasi-BICs interesting for enhancing the emission from quantum emitters. Quasi-BICs have been experimentally realized in silicon for applications in the infrared wavelength range. Instead of silicon, hydrogenated amorphous silicon (a-Si:H) has been used for achieving quasi-BIC resonance in parts of visible spectra. Titanium dioxide (TiO 2 ) has emerged as an alternate material for fabricating dielectric metasurfaces with high Q-factor in the visible spectral range due to its lower absorptive losses and high refractive index. However, the fabrication process for TiO 2 nanostructures presents challenges compared to the well-established fabrication processes in silicon. Our work focuses on the design and fabrication of TiO 2 metasurfaces supporting a quasi-BIC mode around 795 nm, with a theoretical Q-factor of 353. Experimental results reveal a maximum Q-factor of 258 at 791 nm. We discuss encountered fabrication constraints and explore possibilities for improvement in both design and fabrication processes. This study contributes to the understanding of quasi-BIC resonance in TiO 2 metasurfaces, and opens avenues for further exploration in the utilization of TiO 2 for high-Q dielectric metasurfaces, offering i nsights i nto t he d esign and optimization of these structures.

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Section: Resultsmentioning

confidence: 99%

Section: Resultsmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

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Quasi-BIC resonance in TiO2 metasurface for emission enhancement of two-dimensional material

Kuppadakkath,

Barreda,

Yang

et al. 2024

Photonic and Phononic Properties of Engineered Nanostructures XIV

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“…This is important since the Q-factor of quasi-BIC modes dramatically drops in the presence of material absorption. 40 index data of TiO 2 thin film used for nanofabrication of our metasurfaces are shown in the Supporting Information (SI).…”

Section: Resultsmentioning

confidence: 99%

“…The metasurface is composed of a square lattice of cubic nanoresonators with a small notch in one corner similar to the structure introduced in Campione et al For the nanoresonator material, we have chosen TiO 2 instead of other more commonly used dielectric materials with a higher refractive index such as Si due to its negligible absorption loss in the visible spectral range. This is important since the Q-factor of quasi-BIC modes dramatically drops in the presence of material absorption . Measured refractive index data of TiO 2 thin film used for nanofabrication of our metasurfaces are shown in the Supporting Information (SI).…”

Section: Resultsmentioning

confidence: 99%

Color Routing of the Emission from Magnetic and Electric Dipole Transitions of Eu³⁺ by Broken-Symmetry TiO₂ Metasurfaces

Bashiri,

Vaskin,

Tanaka

et al. 2023

ACS Nano

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Manipulation of magnetic dipole emission with resonant photonic nanostructures is of great interest for both fundamental research and applications. However, obtaining selective control over the emission properties of magnetic dipole transitions is challenging, as they usually occur within a manifold of spectrally close emission lines associated with different spin states of the involved electronic levels. Here we demonstrate spectrally selective directional tailoring of magnetic dipole emission using designed photonic nanostructures featuring a high quality factor. Specifically, we employ a hybrid nanoscale optical system consisting of a Eu 3+ compound coupled to a designed broken-symmetry TiO 2 metasurface to demonstrate directional color routing of the compound's emission through its distinct electric and magnetic-dominated electronic transition channels. Using low numerical aperture collection optics, we achieve a fluorescence signal enhancement of up to 33.13 for the magnetic-dominated dipole transition at 590 nm when it spectrally overlaps with a spectrally narrow resonance of the metasurface. This makes the, usually weak, magnetic dipole transition the most intense spectral line in our recorded fluorescence spectra. By studying the directional emission properties for the coupled system using Fourier imaging and timeresolved fluorescence measurements, we demonstrate that the high-quality-factor modes in the metasurface enable free-space light routing, where forward-directed emission is established for the magnetic-dominated dipole transition, whereas the light emitted via the electric dipole transition is mainly directed sideways. Our results underpin the importance of magnetic light− matter interactions as an additional degree of freedom in photonic and optoelectronic systems. Moreover, they facilitate the development of spectrometer-free and highly integrated nanophotonic imaging, sensing, and probing devices.

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High-Q quasi-bound states in the continuum in C2-symmetric metasurface with enhanced second harmonic generation in two-dimensional materials

Wang,

Zheng,

Ouyang

et al. 2024

Optics & Laser Technology

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The impact of loss on high-Q resonant metasurfaces: A case study for heated a-Si:H

Cited by 9 publications

References 66 publications

Quasi-BIC resonance in TiO2 metasurface for emission enhancement of two-dimensional material

Quasi-BIC resonance in TiO2 metasurface for emission enhancement of two-dimensional material

Color Routing of the Emission from Magnetic and Electric Dipole Transitions of Eu³⁺ by Broken-Symmetry TiO₂ Metasurfaces

High-Q quasi-bound states in the continuum in C2-symmetric metasurface with enhanced second harmonic generation in two-dimensional materials

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The impact of loss on high-Q resonant metasurfaces: A case study for heated a-Si:H

Cited by 9 publications

References 66 publications

Quasi-BIC resonance in TiO2 metasurface for emission enhancement of two-dimensional material

Quasi-BIC resonance in TiO2 metasurface for emission enhancement of two-dimensional material

Color Routing of the Emission from Magnetic and Electric Dipole Transitions of Eu3+ by Broken-Symmetry TiO2 Metasurfaces

High-Q quasi-bound states in the continuum in C2-symmetric metasurface with enhanced second harmonic generation in two-dimensional materials

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Product

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About

Color Routing of the Emission from Magnetic and Electric Dipole Transitions of Eu³⁺ by Broken-Symmetry TiO₂ Metasurfaces