Results 121 to 130 of about 21,384 (312)

A Gravitational Redshift Determination of the Mean Mass of White Dwarfs. DBA and DB Stars

open access: yes, 2012
We measure apparent velocities (v_app) of absorption lines for 36 white dwarfs (WDs) with helium-dominated atmospheres -- 16 DBAs and 20 DBs -- using optical spectra taken for the European Southern Observatory SN Ia progenitor survey (SPY).
Bassalo   +24 more
core   +1 more source

Improved Disorder Resilience in Small‐Footprint Photonic Cavities with Periodicity Breaking

open access: yesAdvanced Optical Materials, EarlyView.
Compact photonic crystal cavities with engineered aperiodicity are demonstrated to sustain high quality factormodes and enhanced reproducibility within a minimal footprint. Combining numerical optimization and near‐field measurements, the study reveals how controlled periodicity breaking improves disorder resilience, offering a robust and scalable ...
Nicoletta Granchi   +7 more
wiley   +1 more source

Optical Properties of Graphene/MoS2 Heterostructure: First Principles Calculations

open access: yesNanomaterials, 2018
The electronic structure and the optical properties of Graphene/MoS2 heterostructure (GM) are studied based on density functional theory. Compared with single-layer graphene, the bandgap will be opened; however, the bandgap will be reduced significantly ...
Bin Qiu   +5 more
doaj   +1 more source

Terahertz Volume Plasmon‐Polariton Modulation in All‐Dielectric Hyperbolic Metamaterials

open access: yesAdvanced Optical Materials, EarlyView.
THz volume plasmon‐polariton (VPP) propagation through plasmon‐based hyperbolic metamaterials, made of alternating layers of doped and undoped III‐V semiconductors. Abstract The development of plasmonics and related applications in the terahertz range faces limitations due to the intrinsic high electron density of the standard metals.
Stefano Campanaro   +3 more
wiley   +1 more source

The Sloan Digital Sky Survey Reverberation Mapping Project: The C iv Blueshift, Its Variability, and Its Dependence Upon Quasar Properties [PDF]

open access: bronze, 2018
Mouyuan Sun   +6 more
openalex   +1 more source

Nonlocal optical response in metallic nanostructures

open access: yes, 2014
This review provides a broad overview of the studies and effects of nonlocal response in metallic nanostructures. In particular, we thoroughly present the nonlocal hydrodynamic model and the recently introduced generalized nonlocal optical response (GNOR)
Bozhevolnyi, Sergey I.   +3 more
core   +1 more source

From Brittle to Flexible: Influence of Glucose‐Based Additives on Cellulose Nanocrystal Self‐Assembly in Suspension and Dried Photonic Films

open access: yesAdvanced Optical Materials, EarlyView.
Cellulose nanocrystals (CNCs) self‐assemble in aqueous suspension into chiral nematic liquid crystals, resulting in structurally colored films upon drying. Here, the influence of sugar additives on CNC self‐assembly in suspension and in films are studied.
Buse Tatli   +5 more
wiley   +1 more source

An Extreme Stellar Prominence Eruption Observed by LAMOST Time-domain Spectroscopy

open access: yesThe Astrophysical Journal Letters
We report the detection of an extreme stellar prominence eruption on the M dwarf Large Sky Area Multi-Object Fiber Spectroscopic Telescope (LAMOST) J044431.62+235627.9, observed through time-domain H α spectroscopy with the LAMOST.
Hong-Peng Lu   +8 more
doaj   +1 more source

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