Tootfinder

Polarization control via artificial optical nonlinearity in dielectric metasurfaces
Fuyong Yue, Giacomo Balistreri, Nicola Montaut, Fabrizio Riminucci, Andrea Toma, Riccardo Piccoli, Stefano Cabrini, Roberto Morandotti, Luca Razzari
https://arxiv.org/abs/2509.03752

Polarization control via artificial optical nonlinearity in dielectric metasurfaces
Nonlinear optical phenomena are generally governed by geometry in matter systems, as they depend on the spatial arrangement of atoms within materials or molecules. Metasurfaces, through precisely designed geometries on a subwavelength scale, allow tailoring the optical response of a material far beyond its natural properties. Therefore, metasurfaces are highly appealing to enable the engineering of nonlinear optical interactions at an unprecedented level. Current studies on nonlinear metasurfac…

Structural, dielectric, and ferroelectric characteristics of the low-temperature sintered 65PMN-35PT sample for electroceramic applications
B. Ramachandran, N. Sudarshan, G. Mangamma, M. S. Ramachandra Rao
https://arxiv.org/abs/2507.00614

Structural, dielectric, and ferroelectric characteristics of the low-temperature sintered 65PMN-35PT sample for electroceramic applications
A single-phase 65PMN-35PT ceramic was synthesized at a relatively low temperature (875 oC) using a modified columbite method. X-ray diffraction analysis confirmed the single-phase formation of perovskite 65PMN-35PT with a tetragonal structure. Morphological studies indicated that the sample consisted of small grains with a size of about 2 micro-m. The dielectric properties of the material demonstrate its relaxor behavior near the ferroelectric transition temperature, TC = 457 K. The saturation …

Temperature and Magnetic-Field Dependence of Energy Relaxation in a Fluxonium Qubit
Lamia Ateshian, Max Hays, David A. Rower, Helin Zhang, Kate Azar, R\'eouven Assouly, Leon Ding, Michael Gingras, Hannah Stickler, Bethany M. Niedzielski, Mollie E. Schwartz, Terry P. Orlando, Joel \^I-j. Wang, Simon Gustavsson, Jeffrey A. Grover, Kyle Serniak, William D. Oliver

Temperature and Magnetic-Field Dependence of Energy Relaxation in a Fluxonium Qubit
Noise from material defects at device interfaces is known to limit the coherence of superconducting circuits, yet our understanding of the defect origins and noise mechanisms remains incomplete. Here we investigate the temperature and in-plane magnetic-field dependence of energy relaxation in a low-frequency fluxonium qubit, where the sensitivity to flux noise and charge noise arising from dielectric loss can be tuned by applied flux. We observe an approximately linear scaling of flux noise wit…

Quantum Phase Space Tomography for Electromagnetic Biomaterial Imaging
Alessandro Settimi
https://arxiv.org/abs/2509.00534 https://arxiv.org/pdf/2509.00534…

Quantum Phase Space Tomography for Electromagnetic Biomaterial Imaging
I present a concise, first principles metrological framework for imaging dielectric biomaterials by probing the full phase space (Wigner) distribution of a quantum electromagnetic field. Building on a rigorous multilayer Maxwell and Cole Cole model for stratified tissue, my method (Quantum Phase space Tomography, QPST) couples analytical forward theory with quantum metrology and Bayesian inference. I prepare a structured quantum EM probe (e.g. a squeezed microwave pulse) that interacts with tis…

A Modified Dielectric Contrast based Integral Equation for 2D TE Scattering by Inhomogeneous Domains
Akshay Pratap Singh, Kuldeep Singh, Rajendra Mitharwal
https://arxiv.org/abs/2507.19777

A Modified Dielectric Contrast based Integral Equation for 2D TE Scattering by Inhomogeneous Domains
This work presents a modified domain integral equation approach for the forward problem of TE scattering, employing a modified definition of dielectric contrast and discretizing the electric field density using Rao-Wilton-Glisson (RWG) basis functions. The proposed formulation mitigates the numerical challenges introduced by the gradient-divergence operator in traditional electric field-based vector formulations. The use of RWG basis functions over triangular meshes enhances geometric conformit…

Now Claudio Cattaneo (Barcelona).
Limits are both material and constructed, in a dialectical relationship.
This time the cause of the coming collapse is the shift of imaginary of the good life.
We have agency to make the change - don't just wait for governments to make the change.

Observation of wave amplification and temporal topological state in a genuine photonic time crystal
Jiang Xiong, Xudong Zhang, Longji Duan, Jiarui Wang, Yang Long, Haonan Hou, Letian Yu, Linyang Zou, Baile Zhang
https://arxiv.org/abs/2507.02223

Observation of wave amplification and temporal topological state in a genuine photonic time crystal
Photonic time crystals (PTCs) are materials whose dielectric permittivity is periodically modulated in time, giving rise to bandgaps not in energy-as in conventional photonic crystals-but in momentum, known as k-gaps. These k-gaps enable wave amplification by extracting energy from temporal modulation, offering a mechanism for coherent light generation that bypasses traditional optical gain. PTCs also extend the concept of topological insulators to the time domain, inducing a temporal topologic…

Dielectric environment engineering via 2D material heterostructure formation on hybrid photonic crystal nanocavity
C. F. Fong, D. Yamashita, N. Fang, Y. -R. Chang, S. Fujii, T. Taniguchi, K. Watanabe, Y. K. Kato
https://arxiv.org/abs/2507.19796

Dielectric environment engineering via 2D material heterostructure formation on hybrid photonic crystal nanocavity
Hybrid integration of two-dimensional (2D) materials with nanophotonic platforms has enabled compact optoelectronic devices by leveraging the unique optical and electronic properties of atomically thin layers. While most efforts have focused on coupling 2D materials to pre-defined photonic structures, the broader potential of 2D heterostructures for actively engineering the photonic environment remains largely unexplored. In our previous work, we employed single types of 2D material and showed …

Robust Ferroelectricity in Silicon Dioxide upon Intercalation of Ammonia
Yaxin Gao, Menghao Wu, Jun-Ming Liu
https://arxiv.org/abs/2507.00804 https://

Robust Ferroelectricity in Silicon Dioxide upon Intercalation of Ammonia
The nanoelectronic applications of current ferroelectrics have been greatly impeded by their incompatibility with silicon. In this paper we propose a way to induce ferroelectricity in silicon dioxide (SiO2), which is still the most widely used dielectric material in silicon-based chips. We show first-principles evidence that the intercalation of NH3 molecules into crystalline SiO2 is exothermic, where NH3 molecules form quasi-bonds with SiO2, giving rise to large and robust polarizations. In ge…

An indirect correlation of dielectric properties using optical trapping and dielectric resonance in two different frequency regimes
Somaditya Sen
https://arxiv.org/abs/2507.13584 …

An indirect correlation of dielectric properties using optical trapping and dielectric resonance in two different frequency regimes
Dielectric permittivity, $\varepsilon_r$, of materials are often limited to a sub-GHz range using normal LCR meters. In the GHz range the $\varepsilon_r$ can be measured using Vector Network Analyzers and measurement jigs (waveguides) which are specific for different frequency regimes. Hence, to measure er for the entire frequency range one needs several components and is an extremely costly experiment. However, for applications such as Dielectric Resonator Antennas one need to know the er and …