Design and fabrication of ridge waveguide-based nanobeam cavities for on-chip single-photon sources.

We report on the design of nanohole/nanobeam cavities in ridge waveguides for on-chip, quantum-dot-based single-photon generation. Our design overcomes limitations of a low-refractive-index-contrast material platform in terms of emitter-mode coupling efficiency and yields an outcoupling efficiency of 0.73 to the output ridge waveguide.

Open-geometry modal method based on transverse electric and transverse magnetic mode expansion for orthogonal curvilinear coordinates.

A vectorial modal method is presented based on transverse magnetic and transverse electric mode expansion, which significantly simplifies the evaluation of the operator matrix. The method, which features a true open boundary condition, is introduced for an orthogonal curvilinear coordinate system with the specific examples of circular and elliptical geometries presented. We validate the method by considering challenging problems, such as the calculation of spontaneous emission rates, of modal reflection coefficients and of the effect of the emitter spatial misalignment on the spontaneous emission β factor.

Erratum: Highly Subwavelength, Superdirective Cylindrical Nanoantenna [Phys. Rev. Lett. 120, 237401 (2018)].

This corrects the article DOI: 10.1103/PhysRevLett.120.

Highly Subwavelength, Superdirective Cylindrical Nanoantenna.

A superdirective cylindrical nanoantenna is demonstrated with a multilayered cylindrical metamaterial-inspired structure. Targeting specific scattering coefficients for the dipole and higher-order modes, the ideal limit of needle radiation is demonstrated. A five-layer system is optimized to demonstrate its approach to the theoretical directivity bound.

Control of exceptional points in photonic crystal slabs.

Various ways of controlling the extent of the ring of exceptional points in photonic crystal slabs are investigated. The extent of the ring in photonic crystal slabs is found to vary with the thickness of the slab. This enables recovery of Dirac cones in open, non-Hermitian systems, such as a photonic crystal slab.

Results of primary reparing of hand extensor tendons injuries using surgical treatment.

Unlabelled: Injuries of hand extensor tendons occur as isolated or combined injury or multiple tendons injuries associated with injuries of other hand structures. Clinical pictures of these injuries depends on the level of occurred injury, and can be expressed in loss of function extension of one or more fingers, wrist and creating contractures.

Patients And Methods: This is five-year retrospective study of 87 patients operated at Clinic for Plastic and reconstructive surgery, Clinical Centre University of Sarajevo.

Outcomes of ulnar nerve grafting.

Introduction: The ulnar nerve is a mixed motor and sensory nerve, which making nerve repair more difficult and functional recovery less predictable than pure sensory nerves. Recovery of muscle activity and restoration of sensibility are essential for a functional extremity. A nerve graft, if performed in a tensionless manner, has been shown to generally have better results than an end-to-end approximation performed under tension.

Results of surgery treatment of Dupuytren's contracture in 115 patients.

Introduction: Dupuytren's disease (DD) is a progressive fibroproliferative disorder of the hand causing digital flexion contracture. Treatment goals include removing or releasing the fibrotic cord to allow extension of the affected finger(s) and restoration of hand function.

Material And Methods: In study period from 2001 through 2008, evaluation was performed in 115 patients.

Impact of the excitation source and plasmonic material on cylindrical active coated nano-particles.

Electromagnetic properties of cylindrical active coated nano-particles comprised of a silica nano-cylinder core layered with a plasmonic concentric nano-shell are investigated for potential nano-sensor applications. Particular attention is devoted to the near-field properties of these particles, as well as to their far-field radiation characteristics, in the presence of an electric or a magnetic line source. A constant frequency canonical gain model is used to account for the gain introduced in the dielectric part of the nano-particle, whereas three different plasmonic materials (silver, gold, and copper) are employed and compared for the nano-shell layers.

Sub-Wavelength Resonances in Metamaterial-Based Multi-Cylinder Configurations.

Sub-wavelength resonances known to exist in isolated metamaterial-based structures of circular cylindrical shape are investigated with the purpose of determining whether the individual resonances are retained when several of such resonant structures are grouped to form a new structure. To this end, structures consisting of 1, 2 and 4 sets of metamaterial-based concentric cylinders excited by an electric line current are analyzed numerically. It is demonstrated that these structures recover the resonances of the individual structures even when the cylinders are closely spaced and the new structure is thus electrically small.

A numerical investigation of sub-wavelength resonances in polygonal metamaterial cylinders.

The sub-wavelength resonances, known to exist in metamaterial radiators and scatterers of circular cylindrical shape, are investigated with the aim of determining if these resonances also exist for polygonal cylinders and, if so, how they are affected by the shape of the polygon. To this end, a set of polygonal cylinders excited by a nearby electric line current is analyzed numerically and it is shown, through detailed analysis of the near-field distribution and radiation resistance, that these polygonal cylinders do indeed support sub-wavelength resonances similar to those of the circular cylinders. The dispersion and loss, inevitably present in realistic metamaterials, are modeled by the Drude and Lorentz dispersion models to study the bandwidth properties of the resonances.

Elevated serum C-reactive protein concentration in Bosnian patients with probable Alzheimer's disease.

Studies indicate that inflammatory mechanisms may play an important role in the pathogenesis of Alzheimer's disease (AD). C-reactive protein (CRP), marker and mediator of inflammation, has been detected in lesions typical for the affected areas of AD brain. There have been conflicting reports on serum CRP concentration in AD.

Minimal invasive laparoscopic hysterectomy with ultrasonic scalpel.

Background: The purpose of the study was to assess whether total laparoscopic hysterectomy with the ultrasonic scalpel offers advantages in term of intraoperative and postoperative outcomes over the conventional abdominal hysterectomy.

Methods: A case-control study to compare patients undergoing total laparoscopic hysterectomy and women undergoing abdominal hysterectomy for benign conditions was designed. Matching criteria were the menopausal status, the need of adnexectomy, and the uterus weight.