67 research outputs found

    Infrared digital thermography of scrotum in early selection of progressive varicocele

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    a b s t r a c t Varicocele is frequent but correctable cause of male infertility. Varicocelectomy is the most commonly performed operative procedure for varicocele. Majority of varicocele patients do not have fertility problem, therefore surgical correction is not recommended in all prevalent cases. On the other hand, varicocele is a progressive condition in some cases and individual with varicocele is at risk for developing impairment which can ultimately lead to semen deterioration and consequent infertility. Selection of patients with varicocele that will progress and cause infertility is beyond our current diagnostic capabilities. Diagnostic assessment of varicocele depends on physical examination and scrotal ultrasound/doppler. Infrared digital thermography of scrotum is a non-invasive and objective diagnostic method for early varicocele detection by means of temperature measurement on the scrotal skin surface. The criteria for diagnostic use of scrotal thermography were recently presented. We hypothesize that the infrared digital thermography of scrotum could be the cornerstone in detection of varicoceles that tend to progress with impairment of semen quality and will require surgical correction, among all prevalent varicocele cases. Ó 2013 Elsevier Ltd. All rights reserved. Introduction Varicocele is a dilatation of pampiniform venous plexus within the spermatic cord. A clinical varicocele is found in about 15% of all adult males Arising problem that requires solution is well-timed selection of men with varicoceles that tends to progress and to impair semen quality. These are progressive deterioration of semen quality (PDSQ) varicoceles. Selected PDSQ varicoceles that will develop infertility would clearly require surgical treatment. Diagnostic proposal for that kind of selection is still absent Infrared digital thermography of scrotum is sensitive noninvasive diagnostic tool for early varicocele detection by means of temperature measurement on the scrotal skin surface. Despite the fact that it is an objective and short diagnostic method, it was sporadically used in clinical practice during past. Lack of complete diagnostic parameters and high cost were considered as the main reasons. Recent study suggested diagnostic criteria for thermography of scrotum for varicocele detection 0306-9877/$ -see front matter

    Angular Dependence of Fluorescence Emission from Quantum Dots inside a Photonic Crystal

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    The fluorescence of emitters embedded in a photonic crystal is known to be inhibited by the presence of an incomplete photonic band gap or pseudogap acting in their emission range. Here, we present a study of the angular dependence of the fluorescence emission of emitters embedded in a photonic crystal. Our results clearly show an angular dependence of the fluorescence emission, which is caused by the presence of an incomplete 3D band gap

    Controlling the photoluminescence of CdSe/ZnS quantum dots with a magnetic field

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    We present an investigation of the photoluminescence of CdSe/ZnS quantum dots at high light intensity and in low magnetic fields. Upon increasing the magnetic field up to 90G, the photoluminescence intensity drops. When decreasing the magnetic field back to zero the photoluminescence drop remains present. A plausible explanation is the Zeeman splitting of defect-associated energy levels under the influence of a magnetic field. The defect-trapped electrons may then be positioned at a metastable level, thereby reducing the number of recombinations. This effect may be used to control the luminescence of quantum dots

    Nonlinear optical enhancement caused by a higher order multipole mode of metallic triangles

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    © The Royal Society of Chemistry 2015. We describe a nonlinear optical study of gold triangles that exploits a higher order plasmonic resonance. A comprehensive nonlinear optical characterisation was performed both by second harmonic generation (SHG) and two photon fluorescence spectroscopy (2PF). We demonstrate and explain the enhancement of the coherent and incoherent nonlinear optical emission by a higher order multipolar mode of the plasmonic structure. The peculiarities of the mode shape and its influence on intensity and polarisation of the nonlinear signal are experimentally and numerically confirmed.crosscheck: This document is CrossCheck deposited related_data: Supplementary Information copyright_licence: The Royal Society of Chemistry has an exclusive publication licence for this journal copyright_licence: The accepted version of this article will be made freely available after a 12 month embargo period history: Received 24 October 2014; Accepted 10 December 2014; Advance Article published 7 January 2015; Version of Record published 5 February 2015status: publishe

    Development of magnetic materials for photonic applications

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    In this manuscript, the synthesis and characterization of superparamagnetic particles and their silica-coated counterparts as building blocks for magnetic photonic crystals is fully described. The advantages and disadvantages of the presented synthetic method are discussed. Preliminary results considering the presence of magnetic species within a photonic crystal are also presented. Suppression of emission of the quantum dots within photonic crystals is attributed to a decrease of the number of available photonic modes for radiative decay. The presence of materials with permanent magnetic moments within photonic crystals shows that suppression of their emission is scaled with the strength of the magnetic field
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