Mie-scattering controlled all-dielectric resonator-antenna for bright and directional point dipole emission

Designing a deterministic, bright, robust, room temperature stable, on-demand solid-state single photon source has been a major demand in the field of quantum-photonics. For this, various single-photon resonator and antenna schemes are being actively explored. Here, using the Cartesian multi-polar decomposition of the excited Mie-scattering moments, we present the design of a all-dielectric coupled-dipolar antenna comprising of two dielectric (Tin-oxide, TiO$_2$) cylinders sandwiching a nanodiamond based nitrogen-vacancy (NV$^-$) center trapped in a poly-vinyl alcohol (PVA) matrix. The Mie-scattering resonant cavity formed in the middle PVA layer provides more than an order of magnitude decay rate or Purcell enhancement. The balancing of the electric and magnetic dipolar moments (a phenomenon commonly known as the Kerker condition) of the coupled TiO$_2$ cylinders under NV$^-$ dipole excitation, provides significant directionality to the radiation pattern. Using a collection lens with a numerical aperture (NA) of 0.9 the vertical collection efficiency (VCE) was observed to be around 80\% at the NV$^-$ center's zero-phonon line wavelength

Mie-scattering controlled all-dielectric cavity coupled antenna for bright and directional single-photon emission

A deterministic, bright, room-temperature stable single-photon-source (SPS) has been a major demand in the field of quantum-photonics. Here, using computational and analytical techniques, we showed that the Mie-scattering moments of an all-dielectric cavity-cum-antenna helps in shaping the spontaneous emission process of a point-dipole emitter, the nanodiamond NV$^-$ center here. Our cavity-cum-antenna design comprises of two top and bottom TiO$_2$ cylinders with a sandwiched poly-vinyl-alcohol (PVA) layer enclosing the nanodiamond crystal. The Cartesian multi-polar decomposition (CMD) of the Mie-scattering moments of the sandwiched PVA layer with subwavelength scale thickness showed strong electric-dipole (ED) resonance which resulted in significant field confinement, making the PVA layer to act as a cavity, providing a Purcell enhancement of more than an order-of-magnitude for all dipole orientations. Further, the Mie-scattering moments of the top and bottom TiO$_2$ cylinders were observed to control the radiation pattern of the embedded dipole-emitter. The radiation directionality along the vertical directions was found to be maximum at the Kerker point (electric dipole moment, ED = magnetic dipole moment, MD), the collection efficiency (CE) being about 80\%. This will result in photon collection rates of a few 100 MHz, unachievable till now. Our results are therefore substantial to accelerate the research for generating on-demand SPS for quantum-photonic applications

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Insomnia is a prevalent sleeping disorder associated with increasing cardiovascular (CV) mortality and morbidity. However, data incorporating recent clinical studies evaluating these outcomes is scarce. Hence, we aimed to investigate the association of insomnia with CV mortality, myocardial infarction (MI), all-cause mortality, and incidence of CV disease by conducting the first-ever meta-analysis of real-world data evaluating these CV outcomes. MEDLINE and Scopus databases were queried till August 2022 to identify studies comparing prespecified outcomes in patients with and without insomnia. The primary outcomes were CV mortality and myocardial infarction, while secondary outcomes included all-cause mortality, and CV-disease incidence. All data were pooled using an inverse-variance weighted random-effects model, and results were reported as relative risks (RRs) and p-values. 21 studies were analyzed. Risks for CV mortality and MI were significantly higher in patients with insomnia (RR 1.53, p</div

Forest plot evaluating all-cause mortality in patients with vs. without insomnia.

Forest plot evaluating all-cause mortality in patients with vs. without insomnia.</p

Forest plot evaluating CV-mortality in patients with vs. without insomnia.

Forest plot evaluating CV-mortality in patients with vs. without insomnia.</p

Sub-group analysis comparing CV-disease incidence in patients with vs. without insomnia based on length of follow-up period.

Sub-group analysis comparing CV-disease incidence in patients with vs. without insomnia based on length of follow-up period.</p

Forest plot evaluating the incidence of MI in patients with vs. without insomnia.

Forest plot evaluating the incidence of MI in patients with vs. without insomnia.</p

Forest plot evaluating the CV-disease incidence in patients with vs. without insomnia.

Forest plot evaluating the CV-disease incidence in patients with vs. without insomnia.</p

PRISMA flow diagram.

Insomnia is a prevalent sleeping disorder associated with increasing cardiovascular (CV) mortality and morbidity. However, data incorporating recent clinical studies evaluating these outcomes is scarce. Hence, we aimed to investigate the association of insomnia with CV mortality, myocardial infarction (MI), all-cause mortality, and incidence of CV disease by conducting the first-ever meta-analysis of real-world data evaluating these CV outcomes. MEDLINE and Scopus databases were queried till August 2022 to identify studies comparing prespecified outcomes in patients with and without insomnia. The primary outcomes were CV mortality and myocardial infarction, while secondary outcomes included all-cause mortality, and CV-disease incidence. All data were pooled using an inverse-variance weighted random-effects model, and results were reported as relative risks (RRs) and p-values. 21 studies were analyzed. Risks for CV mortality and MI were significantly higher in patients with insomnia (RR 1.53, p</div