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High-performance EUV Ptychography at 13.5 nm

High-performance EUV Ptychography at 13.5 nm

2023 Computational Optical Sensing and Imaging, COSI 2023 in Optica Imaging Congress - Part of Imaging and applied optics Congress 2023

作者： Eschen, W. Liu, C. Penagos Molina, D.S. Klas, R. Limpert, J. Rothhardt, J. Helmholtz Institute Jena Fröbelstieg 3 Jena07743 Germany GSI Helmholtzzentrum für Schwerionenforschung Planckstraße 1 Darmstadt64291 Germany Institute of Applied Physics Abbe Center of Photonics Friedrich-Schiller-University Jena Albert-Einstein-Straße 15 Jena07745 Germany Fraunhofer Institute for Applied Optics and Precision Engineering IOF Albert-Einstein-Str. 7 Jena07745 Germany

We present table-top high-speed EUV ptychography at 13.5 nm. Employing a novel sCMOS detector enables 5x faster wide-field imaging with an imaging speed of 4.6 Mpix/h. Further, Hertz-scale high-resolution EUV wavefron... 详细信息

ISBN: (纸本)9781957171289

关键词： Biomedical imaging Complementary metal oxide semiconductors High harmonic generation Ptychography Refractive index Wave front sensing

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Characterization of femtosecond laser-written waveguides in silicon

Characterization of femtosecond laser-written waveguides in ...

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Conference on Lasers and Electro-optics (CLEO)

作者： Namig Alasgarzade Alessandro Alberucci Markus Blothe Maxime Chambonneau Chandroth P. Jisha Stefan Nolte Institute of Applied Physics Abbe Center of Photonics Friedrich-Schiller-Universität Jena Jena Germany Center of Excellence in Photonics Fraunhofer Institute for Applied Optics and Precision Engineering IOF Jena Germany

We characterize laser-written waveguides in silicon versus the inscription parameters such as scanning speed and pulse energy. The analysis is carried out at different wavelengths and polarization states. Finally, the... 详细信息

ISBN: (纸本)9781957171258

关键词： Femtosecond pulses Laser sources Material properties Refractive index Silicon Waveguides

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Enhanced Surface Second Harmonic Generation in Nanolaminates

arXiv

引用

arXiv 2023年

作者： Abtahi, Fatemeh Paul, Pallabi Beer, Sebastian Kuppadakkath, Athira Pakhomov, Anton Szeghalmi, Adriana Nolte, Stefan Setzpfandt, Frank Eilenberger, Falk Friedrich Schiller University Jena Institute of Applied Physics Abbe Center of Photonics Albert-Einstein-Str. 15 Jena07745 Germany Franhofer-Institute for Applied Optics and Precision Engineering IOF Albert-Einstein-Straße7 Jena07745 Germany Max Plank School of Photonics Jena Germany

Second-harmonic generation (SHG) is a second-order nonlinear optical process that is not allowed in media with inversion symmetry. However, due to the broken symmetry at the surface, surface SHG still occurs, but is generally small. We experimentally investigate the surface SHG in periodic stacks of alternating, subwavelength dielectric layers, which have a large number of surfaces, thus enhancing surface SHG considerably. To this end, multilayer stacks of SiO2/TiO2 were grown by Plasma Enhanced Atomic Layer Deposition (PEALD) on fused silica substrates. With this technique individual layers of a thickness of less than 2 nm can be fabricated. We experimentally show that under large angles of incidence (> 20 degrees) there is substantial SHG, well beyond the level, which can be observed from simple interfaces. We perform this experiment for samples with different periods and thickness of SiO2/TiO2 and our results are in agreement with theoretical calculations. © 2023, CC BY.

关键词： Harmonic generation

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Tailored Apodization of Femtosecond Written Fiber Bragg Gratings by Aperture Shaping

Tailored Apodization of Femtosecond Written Fiber Bragg Grat...

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Bragg Gratings, Photosensitivity and Poling in Glass Waveguides and Materials, BGPP 2022

作者： Krämer, Ria G. Schmittner, Christian P. Goebel, Thorsten A. Siems, Malte P. Ullsperger, Tobias Imogore, Timothy O. Richter, Daniel Nolte, Stefan Institute of Applied Physics Abbe Center of Photonics Friedrich Schiller University Jena Albert-Einstein-Str. 15 JenaD-07745 Germany Fraunhofer Institute for Applied Optics and Precision Engineering IOF Center of Excellence in Photonics Albert-Einstein-Str. 7 JenaD-07745 Germany

We present the realization of tailored apodization profiles of femtosecond written FBGs using phase mask scanning technique with aperture shaping. By controlling the cross-sectional dimension of the refractive index m... 详细信息

ISBN: (纸本)9781957171166

关键词： Fiber Bragg gratings

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Quantum image distillation with undetected light

Quantum image distillation with undetected light

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CLEO: Fundamental Science, CLEO:FS 2024 - Part of Conference on Lasers and Electro-optics, CLEO 2024

作者： Fuenzalida, Jorge Basset, Marta Gilaberte Töpfer, Sebastian Torres, Juan P. Gräfe, Markus Institute of Applied Physics Technical University of Darmstadt Schloßgartenstraße 7 Darmstadt64289 Germany Fraunhofer Institute for Applied Optics and Precision Engineering IOF Albert-Einstein-Str. 7 Jena07745 Germany Friedrich Schiller University Jena Abbe Center of Photonics Albert-Einstein-Str. 6 Jena07745 Germany ICFO-Institut de Ciencies Fotoniques The Barcelona Institute of Science and Technology Castelldefels08860 Spain Dept. Signal Theory and Communications Universitat Politecnica de Catalunya Barcelona08034 Spain

The distillation of genuine object data from noise when recoding an image is of immense value in modern microscopy. We demonstrate, an approach in the realm of quantum imaging without the need of measuring correlation... 详细信息

ISBN: (纸本)9781957171395

关键词： Correlation Electro-optical waveguides Laser modes Laser noise Lasers and electrooptics Microscopy

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Photon-Pair Recombination via Sum-Frequency Generation by Chirped, Aperiodically Poled LiNb Waveguide

Photon-Pair Recombination via Sum-Frequency Generation by Ch...

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Conference on Lasers and Electro-optics Europe (CLEO EUROPE)

作者： Patrick Hendra Josué Ricardo León-Torres Markus Gräfe Fraunhofer Institute of Applied Optics and Precision Engineering IOF Jena Germany Abbe Center of Photonics Friedrich-Schiller-Universität Jena Jena Germany Institute of Applied Physics Technical University of Darmstadt Darmstadt Germany

ISBN: (纸本)9798350345995

In the past couple of decades, the use of quantum states of light has been gaining interest in different disciplines from telecommunications to imaging and sensing due to its non-classical features that allow to exceed classical limitations. A quantum enhancement in fluorescence microscopy has been explored in a recent study, whereby, time-frequency-entangled photon pairs generated through spontaneous parametric down conversion (SPDC) process were used to demonstrate linear absorption rates in standard fluorophores by the virtue of entangled two-photon absorption (ETPA) [1]. Meanwhile, a prior study on sum-frequency generation (SFG) with down-converted photon pairs has demonstrated that the rate of photon pair recombination is linearly proportional to the down-converted bandwidth [2]. In other words, as the bandwidth of the down-converted photon pairs increases, it reduces the temporal separation between the photons, which in turn, increases the probability for up-conversion via SFG.

关键词： Fluorescence microscopy Imaging Lithium niobate Parametric down conversion Sum frequency generation Upconversion

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Design and fabrication of a novel phase mask to inscribe fiber Bragg gratings for astronomical applications

Design and fabrication of a novel phase mask to inscribe fib...

引用

Conference on Lasers and Electro-optics (CLEO)

作者： Aashia Rahman Thomas Siefke Kalaga Madhav Thorsten A. Goebel Abdolnaser Ghazagh Uwe D. Zeitner Xijie Luo Daniel Richter Stefan Nolte Martin M. Roth innoFSPEC Leibniz Institute for Astrophysics Potsdam (AIP) Potsdam Germany Institute of Applied Physics Friedrich Schiller University Jena Jena Germany Center of Excellence in Photonics Fraunhofer Institute for Applied Optics and Precision Engineering IOF Jena Germany

A novel phase mask (PM) consisting of overlapped regions of more than one uniform pitch is fabricated using e-beam lithography. Design, fabrication of PMs, and filter characteristics are presented.

ISBN: (纸本)9781957171258

A novel phase mask (PM) consisting of overlapped regions of more than one uniform pitch is fabricated using e-beam lithography. Design, fabrication of PMs, and filter characteristics are presented.

关键词： Effective refractive index Electron beam lithography Fiber Bragg gratings Fused silica Ion beams Lithography

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Mid-Infrared Quantum Scanning Microscopy with Visible Light

Mid-Infrared Quantum Scanning Microscopy with Visible Light

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Conference on Lasers and Electro-optics Europe (CLEO EUROPE)

作者： Josué Ricardo León-Torres Jorge Fuenzalida Marta Gilaberte Sebastian Töpfer Markus Gräfe Fraunhofer Institute of Applied Optics and Precision Engineering IOF Jena Germany Friedrich-Schiller-Universität Jena Abbe Center of Phoptonics Jena Germany Institute of Applied Physics Technische Universität Darmstadt Darmstadt Germany

ISBN: (纸本)9798350345995

Laser scanning microscopy (LSM) is known to be the workhorse for modern life-science, it allows to get new insights into a variety of biological processes. LSM together with illumination in the mid infrared region (Mid-IR) permits to map the chemical composition of samples to a space frame. However, low-light observations in the Mid-IR spectrum are still challenging and a limiting factor for a faster development. A label-free quantum scanning imaging system is presented here, capable of performing the detection in the visible regime, while the illumination is carried out in the Mid-IR region. Our quantum imaging with undetected light implementation aims to retrieve amplitude and phase images of biological samples containing a variety of functional groups that are present in the Mid-IR region

关键词： Biomedical imaging Imaging systems Mid infrared Phase imaging Quantum imaging Scanning microscopy

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Enhancing Nonlinear Effects Through Lattice Plasmon Excitation in Plasmonic Metasurfaces

Enhancing Nonlinear Effects Through Lattice Plasmon Excitati...

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Conference on Lasers and Electro-optics Europe (CLEO EUROPE)

作者： Jeetendra Gour Sebastian Beer Alessandro Alberucci Christin David Stefan Nolte Uwe D. Zeitner Friedrich Schiller University Jena Institute of Applied Physics Jena Germany Friedrich Schiller University Jena Institute of Condensed Matter Theory and Optics Jena Germany Fraunhofer Institute for Applied Optics and Precision Engineering IOF Jena Germany Department of Applied Sciences and Mechatronics Munich University of Applied Sciences Munich Germany

ISBN: (纸本)9798350345995

Plasmonic metasurfaces have gained significant attention in recent years due to their potential applications in areas such as biosensing, biomedical research, and photonic devices. These metasurfaces possess two main types of resonances: localized surface plasmon resonance (LSPR) from individual metal nanoantennas, and surface lattice resonance (SLR) arising from the periodic arrangement of the plasmonic nanoantennas [1]. The interplay between these two resonances determines the linear optical response of plasmonic metasurfaces. The strong field enhancement associated with the linear resonances has also been widely exploited to boost nonlinear effects [3].

关键词： Field enhancement Localized surface plasmon resonance Metasurfaces Nonlinear effects Photonic devices Scanning electron microscopy

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Application of the Green function formalism to the interplay between avalanche and multiphoton ionization induced by optical pulses

arXiv

引用

arXiv 2023年

作者： Alberucci, Alessandro Jisha, Chandroth P. Nolte, Stefan Friedrich-Schiller-University Institute of Applied Physics Albert-Einstein-Str. 15 Jena07745 Germany Fraunhofer Institute for Applied Optics and Precision Engineering IOF Albert-Einstein-Str. 7 Jena07745 Germany

A fundamental brick of light-matter interaction at large optical intensities is the generation of a plasma. The optically-induced plasma in turn plays a fundamental role in determining the optical propagation. The plasma generation is a result of the interplay between multi-photon, tunnel and avalanche ionization. Here we use the basic rate equations to discuss an analytical model for the interaction between these physical effects. After defining a nonlinear impulse response for the system, we describe how the interplay depends on the features of the optical pulses. Our approach strongly simplifies the modelling of the propagation of ultrashort-pulses, paving the way to a much easier and faster interpretation of experimental observations, with potential impact on the broad fields of ultrafast light-matter interaction and laser micro-machining. Copyright © 2023, The Authors. All rights reserved.

关键词： Laser pulses

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