Tootfinder

Critical photoinduced reflectivity relaxation dynamics in single-layer Bi-based cuprates near the pseudogap end point
T. Shimizu, R. Tobise, T. Kurosawa, S. Tsuchiya, M. Oda, Y. Toda, V. V. Kabanov, D. Mihailovic, T. Mertelj
https://arxiv.org/abs/2508.21298

Critical photoinduced reflectivity relaxation dynamics in single-layer Bi-based cuprates near the pseudogap end point
A comprehensive study of photoinduced transient reflectivity dynamics in heavily overdoped single-layer cuprate (Bi,Pb)$_{2}$Sr$_{2}$CuO$_{6+δ}$ (Pb-Bi2201), across the end points of the pseudogap and superconducting phases, has been conducted using optical ultrafast time-resolved pump-probe spectroscopy. In the Pb-Bi2201 just before reaching the pseudogap end point, the transient reflectivity dynamics above $T_{\rm c}$ resemble the pseudogap response observed in optimally doped La-Bi2201. At …

Highly Efficient and Broadband Optical Delay Line towards a Quantum Memory
Yu Guo, Anindya Banerji, Jia Boon Chin, Arya Chowdhury, Alexander Ling
https://arxiv.org/abs/2509.02096

Highly Efficient and Broadband Optical Delay Line towards a Quantum Memory
We demonstrate a high-efficiency, free space optical delay line utilizing a nested multipass cell architecture. This design supports extended optical paths with low loss, aided by custom broadband dielectric coating that provides high reflectivity across a wide spectral bandwidth. The cell is characterized using polarization-entangled photon pairs, with signal photons routed through the delay line and idler photons used as timing reference. Quantum state tomography performed on the entangled pa…

High-reflectivity homoepitaxial distributed Bragg reflectors for photonic applications
Helena Janowska, Anna Musia{\l}, Grzegorz S\k{e}k
https://arxiv.org/abs/2507.20211 https:/…

High-reflectivity homoepitaxial distributed Bragg reflectors for photonic applications
Distributed Bragg reflectors (DBRs) are one of the basic photonic structures used to define microcavities for fundamental light-matter coupling studies, as well as to optimize performance of optoelectronic and photonic devices, e.g., lasers or non-classical light sources. The reflectivity of these structures depends critically on the refractive index contrast between the two quarter-wavelength thick layers constituting the DBR. At the same time, epitaxial fabrication process limits the choice o…

Absence of reflectivity of the phonon-polariton at the SiC surface from the metal mask edge
V. S. Ivchenko, D. V. Kazantsev, V. A. Ievleva, D. A. Matienko, E. A. Kazantseva, A. Yu. Kuntsevich
https://arxiv.org/abs/2506.19080

Absence of reflectivity of the phonon-polariton at the SiC surface from the metal mask edge
Surface phonon polariton (SPhP) waves are excited at the silicon carbide ($SiC$) surface under irradiation of light close to the lattice resonance frequency. Metal mask at the surface blocks irradiation of certain areas and thus allows tuning standing or propagating wave pattern and, thus, open opportunities for surface polariton optic devices. In this study we show by means of scanning near-field microscopy that the edge of such a mask reflects SPhP waves negligibly. This condition differs dra…

Dynamic compression of glassy GeO$2$ up to the TPa range and first observation of shock induced crystallization
R. Torchio, J. A. Hernandez, A. Cordone, S. Balugani, T. Vinci, A. Ravasio, C. Pepin, N. Sevelin-Radiguet, E. Guillam, F. Dorchies, A. Benuzzi
https://arxiv.org/abs/2508.20695

Dynamic compression of glassy GeO$2$ up to the TPa range and first observation of shock induced crystallization
In this work we present an extensive study of glassy GeO$_2$ under laser induced dynamic compression. New VISAR and SOP data provide the extension of Hugoniot EoS up to the TPa range for this material including temperature measurements. Reflectivity data at both 532 and 1064 nm wavelenght are also reported. In the low compression range we observe changes of the optical properties from transparent, to opaque, to metallic state. The second part of this work describes a further laser shock experim…

Multiscale transform based seismic reflectivity inversion using convolutional neural network
John Castagna (University of Houston), Oleg Portniaguine (Lumina Geophysical, Houston, Tx), Gabriel Gil (Lumina Geophysical, Houston, Tx), Arnold Oyem (Lumina Geophysical, Houston, Tx), Chen Liang (Lumina Geophysical, Houston, Tx)
https://

Multiscale transform based seismic reflectivity inversion using convolutional neural network
The Multiscale Fourier Transform of a seismic trace performs time-frequency analyses over a range of window lengths. The variation in window length captures local and global relative amplitudes between events, thereby allowing reflectivity inversion that is independent of the amplitude spectrum of the seismic wavelet. As the temporal and spatial variation of the actual seismic wavelet in seismic reflection data is poorly known, this approach has many advantages over conventional seismic reflect…

Plasmon-enhanced ultrafast time-resolved spectroscopy of NV-containing diamond
Yuta Kimura, Toshu An, Muneaki Hase
https://arxiv.org/abs/2508.18762 https://

Plasmon-enhanced ultrafast time-resolved spectroscopy of NV-containing diamond
We investigated ultrafast nonlinear optical effects in nitrogen-vacancy (NV)-containing diamond which is in contact with a gold-coated blazed diffraction grating using a pump-probe reflectivity technique. The reflectivity change caused by optical Kerr effect and two-photon absorption was enhanced several times because of the electric field enhancement induced by the propagating surface plasmon (PSP). Furthermore, by performing measurements with varying the incident angle of the pump beam and nu…

Impact of a Reflecting Material on a Search for Neutron--Antineutron Oscillations using Ultracold Neutrons
Hiroyuki Fujioka, Takashi Higuchi
https://arxiv.org/abs/2508.17725 htt…

Impact of a Reflecting Material on a Search for Neutron--Antineutron Oscillations using Ultracold Neutrons
We investigate neutron--antineutron oscillations of ultracold neutrons in a storage bottle represented by a one-dimensional potential. The experimental sensitivity is determined by the annihilation rate of antineutrons. Its dependence on the antineutron reflectivity and the relative phase shift between the neutron and the antineutron wavefunctions by a reflection from the wall is derived. Optimization of the antineutron pseudopotential was found crucial to maximize the sensitivity of the experi…

Neutron reflectometry on superspreading and non-superspreading trisiloxane surfactants
Joshua Reed, S\'eforah Carolina Marques Silva, Philipp Gutfreund, Joachim Venzmer, Tatiana Gambaryan-Roisman, Emanuel Schneck
https://arxiv.org/abs/2507.15038

Neutron reflectometry on superspreading and non-superspreading trisiloxane surfactants
Certain trisiloxane surfactants have the remarkable property of being able to superspread: Small volumes of water rapidly wet large areas of hydrophobic surfaces. The molecular properties of the surfactants which govern this technologically relevant effect are still under debate. To gain a deeper understanding, the surfactant behaviour during the spreading process needs to be studied at molecular length scales. Here, we present neutron reflectivity analyses of two trisiloxane surfactants of sim…

Impulsive excitation of a solid by extreme contrast, high intensity femtosecond laser pulses
Sagar Dam, Jian Fuh Ong, Sk Rakeeb, Ameya Parab, Aparajit C, Anandam, Amit D Lad, Yash M Ved, M Krishnamurthy, Kazuo A Tanaka, G Ravindra Kumar
https://arxiv.org/abs/2508.13649

Impulsive excitation of a solid by extreme contrast, high intensity femtosecond laser pulses
We present the ultra-fast dynamics of the interaction between a high-intensity extreme contrast (expected to be around 1e-18 at hundreds of picoseconds timescale) femtosecond laser and a solid. Simultaneous measurements of probe Doppler spectrometry and reflectivity in pump-probe experiments reveal the presence of extreme pressure in the solid density region, which triggers a long-lived (about 15 ps) strong inward shock. Hydrodynamic simulations accurately replicate these observations, providin…

Boreal Afforestation's Underestimated Cloud Influence on Earth's Energy Imbalance
Enoch Ofosu, Kevin Bradley Dsouza, Daniel Chukwuemeka Amaogu, J\'er\^ome Pigeon, Richard Boudreault, Juan Moreno-Cruz, Pooneh Maghoul, Yuri Leonenko
https://arxiv.org/abs/2508.09295

Boreal Afforestation's Underestimated Cloud Influence on Earth's Energy Imbalance
Earth's Energy Imbalance (EEI) is accelerating, partly due to declining planetary albedo from reduced cloud cover. Boreal afforestation can either mitigate or exacerbate this trend through competing biophysical feedbacks. While snow masking reduces surface albedo (+0.5 to +2.5 $W/m^2$ warming), forests can enhance low-level cloud cover (0.1-0.5%) and increase cloud reflectivity via biogenic volatile organic compounds (BVOCs), producing potential cooling (-1.8 to -6.7 $W/m^2$). This BVOC-aerosol…

Exploring Topological Effects in Thin-Film X-Ray Cavities
Hanns Zimmermann, Jonathan Sturm, Ion Cosma Fulga, Jeroen van den Brink, Adriana P\`alffy
https://arxiv.org/abs/2506.10588

Exploring Topological Effects in Thin-Film X-Ray Cavities
Quantum control of single x-ray photons can be achieved using thin-film nanostructure cavities with embedded layers of resonant nuclei. Here, we design and theoretically investigate tailored cavity structures that implement a non-Hermitian version of the Su-Schrieffer-Heeger one-dimensional topological model. By tuning the geometry of the structure, different topological phases can be realized. We show that the presence of topological edge states can be identified in the reflectivity spectra of…

The making of robust and highly performing imaging spectropolarimeters for large solar telescopes
G. B. Scharmer, J. de la Cruz Rodr\'iguez, J. Leenaarts, B. Lindberg, P. S\"utterlin, T. Hillberg, C. Pietraszewski, A. G. de Wijn, M. Foster, J. Storey
https://arxiv.org/abs/2506.05143…

The making of robust and highly performing imaging spectropolarimeters for large solar telescopes
We discuss the requirements, concepts, simulations, implementation, and calibration of two dual Fabry-Perot based imaging spectropolarimeters, CRISP and CHROMIS, at the Swedish 1-meter Solar Telescope, and CRISP2 that is under construction. These instruments use a combination of a high-resolution and a low-resolution etalon together with an order-sorting prefilter to define the bandpass. The overall design is made robust and stable by tailoring the low-resolution etalon reflectivity to accommod…

Unraveling energy flow mechanisms in semiconductors by ultrafast spectroscopy: Germanium as a case study
Grazia Raciti, Bego\~na Abad, Riccardo Dettori, Raja Sen, Aswathi K. Sivan, Jose M. Sojo-Gordillo, Nathalie Vast, Riccardo Rurali, Claudio Melis, Jelena Sjakste, Ilaria Zardo
https://arxiv.org/abs/2508.10544

Unraveling energy flow mechanisms in semiconductors by ultrafast spectroscopy: Germanium as a case study
Semiconductor materials are the foundation of modern electronics, and their functionality is dictated by the interactions between fundamental excitations occurring on (sub-)picosecond timescales. Using time-resolved Raman spectroscopy and transient reflectivity measurements, we shed light on the ultrafast dynamics in germanium. We observe an increase in the optical phonon temperature in the first few picoseconds, driven by the energy transfer from photoexcited holes, and the subsequent decay in…

Revisiting Fourier-Based Reflection Spectrum Measurement in Coherence Scanning Interferometry
Cheng Chen, Sotero Ordones, Jeremy Coupland, Rong Su
https://arxiv.org/abs/2506.12866

Revisiting Fourier-Based Reflection Spectrum Measurement in Coherence Scanning Interferometry
Recent advancements have extended the capabilities of coherence scanning interferometry (CSI) beyond surface topography measurement to reflectivity spectrum imaging. It is commonly accepted that the one-dimensional(1-D) Fourier magnitude of a pixel-wise CSI signal is proportional to the product of the sample's absolute reflection coefficient spectrum and the light source spectrum. However, this assumption holds true only for low numerical aperture (NA) CSI systems. In this work, we establish a …