Results 221 to 230 of about 305,627 (288)

Excitation of Quasi‐Bound States in the Continuum With Focused Radially Polarized Beams

open access: yesAdvanced Optical Materials, EarlyView.
This work presents an innovative strategy for exciting symmetry‐protected quasi‐bound states in the continuum in periodic arrays of nanostructures using focused radially polarized light beams. Compared to excitation with a tilted plane wave, this approach can achieve both higher quality factors and stronger optical responses.
Luis Cerdán   +4 more
wiley   +1 more source

Engineering Thermal Emission with Enhanced Emissivity and Quality Factor Using Bound States in the Continuum and Electromagnetically Induced Absorption

open access: yesAdvanced Optical Materials, EarlyView.
A metal‐based thermal metasurface supporting bound states in the continuum is demonstrated and experimentally shown to achieve a record‐high quality factor of 202 and high emissivity of 0.82. The design offers thermally stable, narrowband mid‐infrared emission, making it ideal for high‐precision gas sensing applications.
Guodong Zhu   +8 more
wiley   +1 more source

Miniaturized Single‐Photon Level Computational Complex Field Imaging System via Meta‐Optics

open access: yesAdvanced Optical Materials, EarlyView.
8192 Hadamard mask patterns generated by the digital micromirror device (DMD) are projected onto a micro target sample via a metalens. The corresponding modulated intensity spectrum encoded with the spatial information of the target is then captured by a photomultiplier tube (PMT) at the Fourier plane to recover both the amplitude and phase images ...
Yuhao Wang   +10 more
wiley   +1 more source

Dark‐State Guided‐Mode Resonance Sensors: Engineering Miniature Sensing Platforms

open access: yesAdvanced Optical Materials, EarlyView.
This research introduces compact guided‐mode resonance sensing using Gaussian‐beam‐induced symmetry breaking to excite dark states. The method generates high‐quality resonance signals in a small area, demonstrating a sensor with 128 micro‐cells and 200 nm RIU−1 sensitivity, showing potential for lab‐on‐chip and biosensing applications.
Yeong Hwan Ko   +2 more
wiley   +1 more source

Unraveling the Role of Surfactants in Micelle‐Templated Growth of Chiral Plasmonic Nanoparticles

open access: yesAdvanced Optical Materials, EarlyView.
Micelle template‐directed growth enables precise control over the chiroptical properties of gold nanorods. Comparison of surfactants with varying aliphatic tail lengths shows that longer tails increase groove inclination and reduce groove density. Optimized conditions for the longest‐tail surfactant (C18) yield slightly higher g‐factors than those ...
Mónica Paz‐Insua   +7 more
wiley   +1 more source

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