103 research outputs found
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
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