2025
article
OpenAlex
Yunyun Dai, J. Hader, Yi Zhang, Luojun Du et autres
Abstract Efficient photoluminescence (PL) of layered semiconductors is crucial for advancing next‐generation photonic devices. However, thermal effect‐induced destruction typically hinders the practical applications, such as biosensing and imaging. Here, the upconversion PL of multilayer GaSe is reported, which circumvents thermal damage. A …
cn, fi, us
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Accès ouvert
2024
article
OpenAlex
Tuomas Pajunpää, Fedor Nigmatulin, Suvi‐Tuuli Akkanen, Henry A. Fernández et autres
Polaritons formed by strong exciton-photon coupling can drastically increase the distance of coherent energy exchange between excitonic materials, but poor durability or low operational temperature in previously demonstrated materials has limited the range of possible applications. Here, the authors demonstrate two-dimensional transition …
fi
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Accès ouvert
2023
article
OpenAlex
Juan Arias Muñoz, Henri Kaaripuro, Yi Zhang, Susobhan Das et autres
Abstract Interlayer interactions are one of the crucial parameters of two‐dimensional (2D) layered materials‐based junctions. Understanding the limits of interlayer coupling and defining the “maximum building block thickness” in artificially stacked 2D layered materials are key tasks that hold significant importance, not …
fi
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Accès ouvert
2023
article
OpenAlex
Mikko Turunen, Henry A. Fernández, Suvi‐Tuuli Akkanen, Heli Seppänen et autres
Abstract Two-dimensional semiconducting transition metal dichalcogenides (TMDs) have attracted significant interest due to their unique optoelectronic properties. More often, these materials are enclosed inside a dielectric layer that can work as an insulator for field-effect transistors. The insulating layer is typically grown …
fi
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Accès ouvert
2023
article
OpenAlex
Faisal Ahmed, Carlos Rodríguez‐Fernández, Henry A. Fernández, Yi Zhang et autres
Abstract Developing selective and coherent polymorphic crystals at the nanoscale offers a novel strategy for designing integrated architectures for photonic and optoelectronic applications such as metasurfaces, optical gratings, photodetectors, and image sensors. Here, a direct optical writing approach is demonstrated to deterministically …
fi
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2023
conference-paper
OpenAlex
Hoon Hahn Yoon, Faisal Ahmed, Henry A. Fernández, Fedor Nigmatulin et autres
We report ultra-miniaturized (~10×20 µm2) spectrometers with electrically modulated van der Waals junctions in conjunction with a reconstruction algorithm, achieving spectral reconstruction with a spectral resolution of ~3-nm over a broad operation bandwidth for spectral imaging.
fi, cn, gb
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Accès ouvert
2022
article
OpenAlex
Hoon Hahn Yoon, Henry A. Fernández, Fedor Nigmatulin, Weiwei Cai et autres
Miniaturized computational spectrometers, which can obtain incident spectra using a combination of device spectral responses and reconstruction algorithms, are essential for on-chip and implantable applications. Highly sensitive spectral measurement using a single detector allows the footprints of such spectrometers to be scaled …
fi, cn, us, kr, gb
(code pays fourni par la source)
2022
conference-paper
OpenAlex
Carlos Rodríguez Fernández, Mohsin Habib, Ibrahim Issah, Henry A. Fernández et autres
Among all the platforms studied for integrating emitters in photonic devices, 2D materials are one of the most promising for on-demand single-photon sources (SPSs) because of their exceptional flexibility and unique optical response which has opened the way to employ mechanical deformation …
fi
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Accès ouvert
2022
conference-paper
OpenAlex
Hoon Hahn Yoon, Henry A. Fernández, Fedor Nigmatulin, Yunyun Dai et autres
In this paper, we report two strategies for realizing the hybrid photodetection mechanisms for high-performance broadband photodetectors built with tunable van der Waals (vdW) heterojunction interfaces. All electrically-controlled photoresponse tuned by the atomically-thin tunneling barrier and bandgap contrast across the vdW heterojunction …
fi, cn
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Accès ouvert
2022
article
OpenAlex
Abde Mayeen Shafi, Faisal Ahmed, Henry A. Fernández, Md Gius Uddin et autres
/NW devices show ∼5 times enhanced detectivity and ∼3 times higher photoresponsivity. Our results of engineering light-matter interaction and symmetry breaking provide a simple route to induce enhanced and anisotropic functionalities in 2D materials.
fi
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Accès ouvert
2022
article
OpenAlex
Md Gius Uddin, Susobhan Das, Abde Mayeen Shafi, Vladislav Khayrudinov et autres
Engineering of the dipole and the symmetry of materials plays an important role in fundamental research and technical applications. Here, a novel morphological manipulation strategy to engineer the dipole orientation and symmetry of 2D layered materials by integrating them with 1D nanowires …
fi
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Accès ouvert
2022
article
OpenAlex
Suvi‐Tuuli Akkanen, Henry A. Fernández, Zhipei Sun
2D materials are under extensive research due to their remarkable properties suitable for various optoelectronic, photonic, and biological applications, yet their conventional fabrication methods are typically harsh and cost-ineffective. Optical modification is demonstrated as an effective and scalable method for accurate and …
fi
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