Tootfinder

Genetic Algorithm-Based Inverse Design of Guided Wave Planar Terahertz Filters
Ali Dehghanian, Thomas Darcie, Levi Smith
https://arxiv.org/abs/2506.03372 h…

Genetic Algorithm-Based Inverse Design of Guided Wave Planar Terahertz Filters
We present a genetic algorithm (GA)-based inverse design framework for synthesizing high-performance planar terahertz (THz) filters integrated with coplanar striplines (CPSs). The method efficiently explores high-dimensional design spaces to generate filter geometries matching user-defined S-parameter magnitude and phase responses, while enforcing structural connectivity for compatibility with terahertz system-on-chip (TSoC) platforms. To accelerate optimization, filter performance is evaluated…

Correlating Superconducting Qubit Performance Losses to Sidewall Near-Field Scattering via Terahertz Nanophotonics
Richard H. J. Kim, Samuel J. Haeuser, Joong-Mok Park, Randall K. Chan, Jin-Su Oh, Thomas Koschny, Lin Zhou, Matthew J. Kramer, Akshay A. Murthy, Mustafa Bal, Francesco Crisa, Sabrina Garattoni, Shaojiang Zhu, Andrei Lunin, David Olaya, Peter Hopkins, Alex Romanenko, Anna Grassellino, Jigang Wang

Correlating Superconducting Qubit Performance Losses to Sidewall Near-Field Scattering via Terahertz Nanophotonics
Elucidating dielectric losses, structural heterogeneity, and interface imperfections is critical for improving coherence in superconducting qubits. However, most diagnostics rely on destructive electron microscopy or low-throughput millikelvin quantum measurements. Here, we demonstrate noninvasive terahertz (THz) nano-imaging/-spectroscopy of encapsulated niobium transmon qubits, revealing sidewall near-field scattering that correlates with qubit coherence. We further employ a THz hyperspectral…

PixCell: A generative foundation model for digital histopathology images
Srikar Yellapragada, Alexandros Graikos, Zilinghan Li, Kostas Triaridis, Varun Belagali, Saarthak Kapse, Tarak Nath Nandi, Ravi K Madduri, Prateek Prasanna, Tahsin Kurc, Rajarsi R. Gupta, Joel Saltz, Dimitris Samaras
https://arxiv.org/abs/2506.05127

PixCell: A generative foundation model for digital histopathology images
The digitization of histology slides has revolutionized pathology, providing massive datasets for cancer diagnosis and research. Contrastive self-supervised and vision-language models have been shown to effectively mine large pathology datasets to learn discriminative representations. On the other hand, generative models, capable of synthesizing realistic and diverse images, present a compelling solution to address unique problems in pathology that involve synthesizing images; overcoming annota…

Theory of terahertz pulse transmission through ferroelectric nanomembranes
Yujie Zhu, Aiden Ross, Xiangwei Guo, Venkatraman Gopalan, Long-Qing Chen, Jia-Mian Hu
https://arxiv.org/abs/2506.00370

Theory of terahertz pulse transmission through ferroelectric nanomembranes
An analytical model is developed to predict the temporal evolution of the lattice polarization in ferroelectric nanomembranes upon the excitation by a terahertz (THz) electromagnetic pulse of an arbitrary waveform, and the concurrent transmission of the THz pulse in both the linear and the nonlinear regimes. It involves the use of the perturbation method to solve the equation of motion for the lattice polarization in both unclamped and strained ferroelectric nanomembranes within the framework o…

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initial toot: https://mastoxiv.page/@ar…

Three-dimensional reconstruction of THz near-fields from a LiNbO3 optical rectification source
Terahertz (THz) generation by optical rectification in LiNbO3 (LN) is a widely used technique for generating intense THz radiation. The spatiotemporal characterization of THz pulses from these sources is currently limited to far-field methods. While simulations of tilted pulse front THz generation have been published, little work has been done to measure the near-field properties of the THz source. A better understanding of the THz near-field properties will improve optimization of THz generati…

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Ultrafast switching of photoinduced phonon chirality in the antiferrochiral BPO$_{4}$ crystal
Hao Chen, Hanyu Wang, Tingting Wang, Yongsen Tang, Haoshu Li, Xiaohong Yan, Lifa Zhang
https://arxiv.org/abs/2506.03742

Ultrafast switching of photoinduced phonon chirality in the antiferrochiral BPO$_{4}$ crystal
In crystalline systems, chiral crystals cannot interconvert to their enantiomorph post-synthesis without undergoing melting-recrystallization processes. However, recent work indicates that ultrafast terahertz-polarized light has been shown to enable dynamic control of structural chirality in the antiferrochiral boron phosphate (BPO$_4$) crystal. Here, using first-principles calculations and nonlinear phonon dynamics simulations, we investigate the underlying physics of lattice dynamics in this …

Hollywood trauert - „Desperate Housewives“-Star Valerie Mahaffey tot #News #Nachrichten

Deciphering hidden layers images through terahertz spectral fingerprints
Candida Moffa, Daniele Francescone, Alessandro Curcio, Anna Candida Felici, Marco Bellaveglia, Luca Piersanti, Mauro Migliorati, Massimo Petrarca
https://arxiv.org/abs/2505.23965

Deciphering hidden layers images through terahertz spectral fingerprints
Terahertz radiation enables non destructive, depthresolved analysis of layered artworks. This study demonstrates THz multispectral imaging ability to reveal concealed text beneath mockup of pictorial layers, reconstructing hidden narratives at varying depths through frequency domain analysis.Simultaneously, it maps pigment composition, providing valuable chemical information. Showcasing the power to penetrate and decipher stratified materials, this work establishes THz multispectral imaging as …

Terahertz prototype for air pollutants detection
Candida Moffa, Alessandro Curcio, Camilla Merola, Vittoria Maria Orsini, Daniele Francescone, Fernando Jr. Piamonte Magboo, Marco Magi, Massimiliano Coppola, Lucia Giuliano, Mauro Migliorati, Giuseppe Zollo, Massimo Reverberi, Leonardo Mattiello, Massimo Petrarca
https://arxiv.org…

Terahertz prototype for air pollutants detection
In this work, we propose a prototype set-up exploiting terahertz time-domain spectroscopy (THz-TDS) to investigate gaseous compounds. The system is portable and allows to perform remote measurements. We used the prototype to characterise for the first time in literature over a broad THz range, pure dichloromethane and chloroform, two pollutants known as very short-lived substances (VSLS) that strongly contribute to ozone depletion. The THz range allows selectively detecting their absorption lin…