Results 61 to 70 of about 29,144 (218)

Sensing of the acoustic signal by waveguides

Acta Universitatis Agriculturae et Silviculturae Mendelianae Brunensis, 2008
The work is focused on the possibilities of accoustic emission (AE) signal sensing from surfaces inaccessible for commonly used sensors. The aim of the work is to verify the possibility of assembly of several measuring devices for maximalization of the ...
Michal Černý, Pavel Mazal, Josef Filípek   +2 more
doaj   +1 more source

Short and Length‐Independent Group Delay Supported by Topological Edge States in Finite‐Size Su–Schrieffer–Heeger Chains

Advanced Materials Technologies, EarlyView.
This study demonstrates short, length‐independent group delay supported by topological edge states in open Su–Schrieffer–Heeger networks. Strong boundary port coupling enables an order‐of‐magnitude latency reduction compared to bulk modes, alongside robust protection against bulk disorder.
Yu‐Han Chang, Nadia Daniela Rivera Torres, Santiago Figueroa Manrique, Raul A. Robles Robles, Vanna Chrismas Silalahi, Cen‐Shawn Wu, Gang Wang, Giulia Marcucci, Laura Pilozzi, Claudio Conti, Ray‐Kuang Lee, Watson Kuo   +11 more
wiley   +1 more source

Enlarged Eye-Box Accommodation-Capable Augmented Reality with Hologram Replicas

Sensors
Augmented reality (AR) technology has been widely applied across a variety of fields, with head-up displays (HUDs) being one of its prominent uses, offering immersive three-dimensional (3D) experiences and interaction with digital content and the real ...
Woonchan Moon, Joonku Hahn
doaj   +1 more source

Parameter Investigation for Stamp Manufacturing of Complex 3D Geometries Using Nanoimprint Lithography

Advanced Materials Technologies, EarlyView.
Nanoimprint lithography can replicate complex 3D microstructures with undercuts using single‐layer polymer stamps of different elasticities. By combining experiments and simulations, T‐shaped geometries and suitable undercut radii were identified that minimize stress and defects during demolding.
Christos Julianos Karapatzakis, Selina Burkert, Cordelia Friederike Wittemann, Andreas Heinrich   +3 more
wiley   +1 more source

Dielectric Permittivity Tensor of Muscovite for Next Generation All Van Der Waals Broadband Photonic Components

Advanced Optical Materials, EarlyView.
Low‐index and low‐loss vdW muscovite represents an emerging robust dielectric platform for the creation of next‐generation all‐vdW nanophotonic architectures. Its utilization as a low‐index building‐block in all‐vdW multilayers enables extreme optical contrast when paired with MoS2, paving the way to the realization of few‐layer ultrathin DBS ...
Meri H. Hayrapetyan, Maksim L. Sargsyan, Davit A. Karakhanyan, Ani P. Khachatryan, Maria A. Levonyan, Dmitrii Litvinov, Maciej Koperski, Artsruni V. Margaryan, Makars Šiškins, Konstantin S. Novoselov, Davit A. Ghazaryan   +10 more
wiley   +1 more source

Single‐Step Fabrication of Smart 3D Microstructures Exploiting Naphthopyrans as Photoinitiators and Photochromic Molecules

Advanced Optical Materials, EarlyView.
Naphthopyran–benzophenone compounds can act simultaneously as photoinitiators and photochromic molecules for two‐photon polymerization. Using a single‐step process, liquid photoresist is encapsulated within polymerized 3D microstructures, preserving reversible UV–vis photochromism after fabrication.
João P. Leote, Artur Andrishak, Paulo J. Coelho, José R. Fernandes, Christian Maibohm, Jana B. Nieder   +5 more
wiley   +1 more source

Hyperuniform Disorder in Photonic Crystal Slabs With Intrinsic Non‐Hermiticity

Advanced Optical Materials, EarlyView.
Light propagation in photonic crystal slabs with imposed hyperuniform disorder is investigated theoretically and numerically. The hyperuniform disorder is imposed by varying the hole size. The photonic crystal is intrinsically non‐Hermitian due to radiative loss, with non‐Hermiticity appearing as a complex effective mass of a quadratic photonic band ...
Zeyu Zhang, Koorosh Sadri, Brian Gould, Mikael C. Rechtsman   +3 more
wiley   +1 more source

Single‐Photon Emitters in Thickness‐Controlled hBN Directly Grown on Silicon Platform

Advanced Optical Materials, EarlyView.
Direct, catalyst‐free CVD growth produces thickness‐controlled hBN films on SiO2/Si without transfer. Growth temperature, film thickness, and carbon incorporation tune the density and single‐photon fraction of defect emitters while preserving the hBN lattice structure.
Yeunjeong Lee, Dobin Kim, Sofiya Karankova, Su‐Hyun Gong, Young Duck Kim, Jaehyun Park, Hyowon Moon   +6 more
wiley   +1 more source

Strong Enhancement of Er3+ Emission at Room Temperature in Si3N4 Metasurfaces

Advanced Optical Materials, EarlyView.
Erbium‐doped SiN metasurfaces are engineered to support Mie resonances at 1.55μm$1.55\text{}\mathrm{\mu}\mathrm{m}$, enhancing the local density of optical states and accelerating spontaneous emission. By optimizing nanocylinder radius and implantation depth, room‐temperature PL is increased about 18‐fold, while lifetime shortens by nearly an order of ...
Fengkai Wei, Xinru Ji, Tobias J. Kippenberg, Duk‐Yong Choi, Carsten Ronning   +4 more
wiley   +1 more source

Design and Fabrication of a Visible-Light-Compatible, Polymer-Based Photonic Crystal Resonator and Waveguide for Sensing Applications

Micromachines, 2018
In this paper, we have proposed a polymer-based photonic crystal (PhC) resonator, with multiple sizes of cavities, and a waveguide to be used as highly sensitive optical sensor components.
Jiayi Sun, Kenichi Maeno, Shoma Aki, Kenji Sueyoshi, Hideaki Hisamoto, Tatsuro Endo   +5 more
doaj   +1 more source