Plasmon resonances in coupled Babinet complementary arrays in the mid-infrared range

A plasmonic structure with transmission highly tunable in the mid-infrared spectral range is developed. This structure consists of a hexagonal array of metallic discs located on top of silicon pillars protruding through holes in a metallic Babinet complementary film. We reveal with FDTD simulations that changing the hole diameter tunes the main plasmonic resonance frequency of this structure throughout the infrared range. Due to the underlying Babinet physics of these coupled arrays, the spectral width of these plasmonic resonances is strongly reduced, and the higher harmonics are suppressed. Furthermore, we demonstrate that this structure can be easily produced by a combination of the nanosphere lithography and the metal-assisted chemical etching technique

Evidence for critical scaling of plasmonic modes at the percolation threshold in metallic nanostructures

In this work we provide the experimental demonstration of critical scaling of plasmonic resonances in a percolation series of periodic structures which evolve from arrays of holes to arrays of quasi-triangles. Our observations are in agreement with the general percolation theory and could lead to sensor and detector applications

Trocar site herniation after laparoscpic cholesystectomy

Trocar site hernia is a clinical manifestation which leads to variety of clinical pictures and which is difficult to diagnose since it may occur at any time in postoperative period.Patient-related factors such as diabetes mellitus, obesity and age beside the trocar diameter and design, pre-existing fascial defects, direction of port insertion and the site of the port significantly affect the development of trocar site herniation. Early diagnosis and treatment are life-saving for patients who experience intestinal obstruction due to trocar site herniation after laparascopic interventions. This study is about a sixty-six years old female patient who had early-onset trocar site herniation after she applied to our clinic with dyspeptic complaints and underwent elective laparoscopic cholecystectomy after cholelithiasis diagnosis

Role of interactions in the magneto-plasmonic response at the geometrical threshold of surface continuity

The optical and magneto-optical behavior in periodically nanostructured surfaces at the threshold of surface continuity is revealed. We address Co films that evolve from an island-like array to a connecting network of islands that form a membrane pattern. The analysis of magneto-optical spectra as well as numerical simulations show significant differences between continuous and broken membranes that depend dramatically on the energy of the incoming radiation. Light localization increases the magneto-optical signal in the membranes. However, the generation of hot spots is not accompanied with magneto-optic enhancement. The electromagnetic field profile within the membrane system can explain the differences in the transmission and in the magneto-optic Kerr signal

Anemiye Neden Olan Dev İnflamatuar Fibroid Polip: Olgu Sunumu

Giriş ve amaç: İnflamatuar fibroid polip gastrointestinal sistemin nadir görülen, en sık mide antrumundan köken almakla birlikte gastrointestinal sistemin her yerinde görülebilen lezyonudur. Genellikle 1-3 cm boyutlarında olan lezyonun tanısı obtrüksiyona bağlı yakınmalarla veya rastlantısal olarak konulmaktadır. Yazımızda anemiye neden olan dev ileal inflamatuar fibroid polip olgusu sunulmuştur. Olgu: 53 yaşında erkek hasta son haftalarda gelişen güçsüzlük ve renk solgunluğu yakınması ile başvurdu. Fizik muayene ve laboratuar incelemeleri ile demir eksikliği anemisi tanısı konuldu. Anemi etiyolojisi araştırılırken yapılan kolonoskopide terminal ileumda valv’den yaklaşık 20 cm proksimalde 7-8 cm boyutunda pedinküle polipoid lezyon mevcuttu. Hastaya laparoskopik segmenter ince barsak rezeksiyonu yapıldı. Lezyonun patolojik incelemesinde iltihabi fibroid polip saptandı. Sonuç :İnflamatuar fibroid polip demir eksikliği anemisine yol açabilen polipoid nitelikteki oluşumların ayırıcı tanısında göz önünde bulundurulmalıdır

A broadband solar absorber with 12 nm thick ultrathin a-Si layer by using random metallic nanomeshes

We show in theory, simulations, and experiments that, by applying random metallic nanomeshes, a broad-band multilayered structure with a 12 nm thick a-Si film as the active layer can absorb 89% of the total solar energy in the visible range from 400 nm to 700 nm. Such broadness and high absorption can be attributed to the random scattering introduced by the aperiodic metallic nanomeshes and the plasmonic-metamaterial design. The broadband and smooth electromagnetic response, combined with a very high absorption, is desired for solar energy harvesting devices, making this structure a good candidate for high efficiency photovoltaics with ultra-thin active layers

Enhanced broad-band extraordinary optical transmission through subwavelength perforated metallic films on strongly polarizable substrates

We demonstrate through simulations and experiments that a perforated metallic film, with subwavelength perforation dimensions and spacing, deposited on a substrate with a sufficiently large dielectric constant, can develop a broad- band frequency window where the transmittance of light into the substrate becomes essentially equal to that in the film absence. We show that the location of this broad-band extraordinary optical transmission window can be engineered in a wide frequency range (from IR to UV), by varying the geometry and the material of the perforated film as well as the dielectric constant of the substrate. This effect could be useful in the development of transparent conducting electrodes for various photonic and photovoltaic devices

Expanding the clinical and immunological phenotypes of PAX1-deficient SCID and CID patients

Paired box 1 (PAX1) deficiency has been reported in a small number of patients diagnosed with otofaciocervical syndrome type 2 (OFCS2). We described six new patients who demonstrated variable clinical penetrance. Reduced transcriptional activity of pathogenic variants confirmed partial or complete PAX1 deficiency. Thymic aplasia and hypoplasia were associated with impaired T cell immunity. Corrective treatment was required in 4/6 patients. Hematopoietic stem cell transplantation resulted in poor immune reconstitution with absent naïve T cells, contrasting with the superior recovery of T cell immunity after thymus transplantation. Normal ex vivo differentiation of PAX1-deficient CD34+ cells into mature T cells demonstrated the absence of a hematopoietic cell-intrinsic defect. New overlapping features with DiGeorge syndrome included primary hypoparathyroidism (n = 5) and congenital heart defects (n = 2), in line with PAX1 expression during early embryogenesis. Our results highlight new features of PAX1 deficiency, which are relevant to improving early diagnosis and identifying patients requiring corrective treatment