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Million-Q free space meta-optical resonator at near-visible wavelengths.
Nat Commun
November 2024
Department of Electrical and Computer Engineering, University of Washington, Seattle, WA, 98195, USA.
Article Synopsis
- The study focuses on creating high-quality optical resonators, essential for technologies like metrology and quantum optics, particularly aiming to achieve extreme temporal coherence at visible wavelengths.* -
- Researchers developed a new type of etch-free metasurface that minimizes defects, successfully demonstrating an impressive ultrahigh-Q resonance in free space, along with a novel spectroscopy technique for detailed analysis.* -
- By integrating a monolayer material, the team achieved highly unidirectional exciton emission without a power density threshold, showcasing potential applications in optical sensing and controlling quantum light sources.*
Integrating Full-Color 2D Optical Waveguide and Heterojunction Engineering in Halide Microsheets for Multichannel Photonic Logical Gates.
Adv Sci (Weinh)
May 2024
Key Laboratory of Theoretical and Computational Photochemistry, Ministry of Education, College of Chemistry, Beijing Normal University, Beijing, 100875, P. R. China.
Ensuring information security has emerged as a paramount concern in contemporary human society. Substantial advancements in this regard can be achieved by leveraging photonic signals as the primary information carriers, utilizing photonic logical gates capable of wavelength tunability across various time and spatial domains. However, the challenge remains in the rational design of materials possessing space-time-color multiple-resolution capabilities.
View Article and Find Full Text PDFSecond sound resonators and tweezers as vorticity or velocity probes: Fabrication, model, and method.
Rev Sci Instrum
October 2023
Univ. Grenoble Alpes, CNRS, Institut NEEL, F-38042 Grenoble, France.
An analytical model of open-cavity second sound resonators is presented and validated against simulations and experiments in superfluid helium using a new resonator design that achieves unprecedented resolution. The model incorporates diffraction, geometrical misalignments, and flow through the cavity and is validated using cavities operated up to their 20th resonance in superfluid helium. An important finding is that resonators can be optimized to selectively sense either the quantum vortex density carried by the throughflow-as typically done in the literature-or the mean velocity of the throughflow.
View Article and Find Full Text PDFRole of pinch in Argon impurity transport in ohmic discharges of Aditya-U Tokamak.
Sci Rep
September 2023
Department of Physics, Pandit Deendayal Energy University, Raisan, Gandhinagar, 382 007, India.
We present experimental results of the trace argon impurity puffing in the ohmic plasmas of Aditya-U tokamak performed to study the argon transport behaviour. Argon line emissions in visible and Vacuum Ultra Violet (VUV) spectral ranges arising from the plasma edge and core respectively are measured simultaneously. During the experiments, space resolved brightness profile of Ar line emissions at 472.
View Article and Find Full Text PDFA generalized approach to x-ray data modeling for high-energy-density plasma experiments.
Rev Sci Instrum
May 2023
Sandia National Laboratories, Albuquerque, New Mexico 87123, USA.
Accurate understanding of x-ray diagnostics is crucial for both interpreting high-energy-density experiments and testing simulations through quantitative comparisons. X-ray diagnostic models are complex. Past treatments of individual x-ray diagnostics on a case-by-case basis have hindered universal diagnostic understanding.
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