A bound state in the continuum (BIC) is a nonradiating state of light embedded in the continuum of propagating modes providing drastic enhancement of the electromagnetic field and its localization at micro-nanoscale. However, access to such modes in the far-field requires symmetry breaking. Here, it is demonstrated that a nanometric dielectric or semiconductor layer, 1000 times thinner than the resonant wavelength (λ/1000), induces a dynamically controllable quasi-bound state in the continuum (QBIC) with ultrahigh quality factor in a symmetric metallic metasurface at terahertz frequencies. Photoexcitation of nanostrips of germanium activates ultrafast switching of a QBIC resonance with 200% transmission intensity modulation and complete recovery within 7 ps on a low-loss flexible substrate. The nanostrips also form microchannels that provide an opportunity for BIC-based refractive index sensing. An optimization model is presented for (switchable) QBIC resonances of metamaterial arrays of planar symmetric resonators modified with any (active) dielectric for inverse metamaterial design that can serve as an enabling platform for active micro-nanophotonic devices.
Download full-text PDF |
Source |
|---|---|
| http://dx.doi.org/10.1002/adma.202100836 | DOI Listing |
Publication Analysis
Top Keywords
Similar Publications
Spatially ordered recruitment of fast muscles in accordance with movement strengths in larval zebrafish.
Zoological Lett
January 2025
National Institutes of Natural Sciences, Exploratory Research Center On Life and Living Systems (ExCELLS), National Institute for Basic Biology, Okazaki, Aichi, 444-8787, Japan.
In vertebrates, skeletal muscle comprises fast and slow fibers. Slow and fast muscle cells in fish are spatially segregated; slow muscle cells are located only in a superficial region, and comprise a small fraction of the total muscle cell mass. Slow muscles support low-speed, low-force movements, while fast muscles are responsible for high-speed, high-force movements.
View Article and Find Full Text PDFTwo decades of bacterial ecology and evolution in a freshwater lake.
Nat Microbiol
January 2025
Department of Integrative Biology, The University of Texas at Austin, Austin, TX, USA.
Ecology and evolution are considered distinct processes that interact on contemporary time scales in microbiomes. Here, to observe these processes in a natural system, we collected a two-decade, 471-metagenome time series from Lake Mendota (Wisconsin, USA). We assembled 2,855 species-representative genomes and found that genomic change was common and frequent.
View Article and Find Full Text PDFHistorical and political context for Philip Morris International's continuing medical education courses on harm reduction.
Tob Control
January 2025
Retired, University of California San Francisco, San Francisco, California, USA.
In 2024, Philip Morris International's (PMI) website stated they support 'independent' continuing medical education courses on harm reduction for medical and other healthcare professionals. These courses mirrored industry marketing and political strategies by presenting smokeless tobacco products and e-cigarettes as alternatives to smoking, sometimes without mentioning tobacco cessation. The enactment of the US Family Smoking and Tobacco Control Act gave the US Food and Drug Agency jurisdiction over tobacco products and included the industry's 'continuum of risk' frame, and emboldened tobacco companies to make harm reduction claims about these products, which they had previously avoided for fear of triggering restrictive regulation of cigarettes.
View Article and Find Full Text PDFEvaluation of water environmental capacity in a northern river-reservoir continuum using environmental fluid dynamics code.
Sci Total Environ
January 2025
School of Earth System Science, Tianjin University, Tianjin 300072, China.
The hydrodynamics, water temperature, and water quality model for the Dan River and Renzhuang Reservoir continuum were developed using field monitoring data and the Environmental Fluid Dynamics Code (EFDC). An in-situ water discharge experiment enabled the calculation of water propagation time using a simulated flood progression method and the hydrodynamics module of EFDC. Based on these model results, degradation coefficients for chemical oxygen demand, biochemical oxygen demand, nitrogen (N), phosphorus (P), fluoride, arsenic were determined, revealing significantly higher values when the wetland barrage was opening.
View Article and Find Full Text PDFObservation of Laser-Assisted Dynamic Interference by Attosecond Controlled Photoelectron Spectroscopy.
Phys Rev Lett
December 2024
Institute of Atomic and Molecular Physics, Jilin University, Changchun 130012, China.
We have observed the laser-assisted dynamic interference in the electron spectra triggered by attosecond pulse trains. The fingerprints of finer interference fringes, much smaller than the laser photon energy, have been clearly identified experimentally. Our measurements are successfully reproduced by theoretical simulations utilizing the numerical solution to the time-dependent Schrödinger equation and the strong-field approximation.
View Article and Find Full Text PDFWant AI Summaries of new PubMed Abstracts delivered to your In-box?
Enter search terms and have AI summaries delivered each week - change queries or unsubscribe any time!