In this study, silver nanoparticles were chemically synthesized and deposited on glass substrates using a reducing agent of sucrose, at 50°C. Different characterizations including atomic force microscopy (AFM), field emission scanning electron microscopy (FESEM), and Raman spectroscopy were obtained to study silvery substrates. Then, the silvery substrates were used as the SERS substrates to detect vibrational modes of phenylalanine amino acid up to the concentration of 10 -7 M. The importance of phenylalanine amino acid detection is due to the early diagnosis of phenylketonuria in neonates. Therefore, the blood plasma of a healthy neonate and a neonate with phenylketonuria disease were adsorbed on the SERS substrates. They enhance the intensity of molecular vibration peaks of phenylalanine amino acid of two kinds of blood plasmas. The intensities of molecular vibrations of unhealthy plasma are stronger than healthy plasma due to the higher concentrations of phenylalanine amino acid, which is the sign of Phenylketonuria disease.
{"title":"Molecular Diagnosis of Plasma Phenylalanine in Neonates with Phenylketonuria Disease Using Biological Sensors Based on Surface-Enhanced Raman Spectroscopy (SERS)","authors":"N. Sharifi, V. Eskandari","doi":"10.29252/IJOP.14.1.31","DOIUrl":"https://doi.org/10.29252/IJOP.14.1.31","url":null,"abstract":"In this study, silver nanoparticles were chemically synthesized and deposited on glass substrates using a reducing agent of sucrose, at 50°C. Different characterizations including atomic force microscopy (AFM), field emission scanning electron microscopy (FESEM), and Raman spectroscopy were obtained to study silvery substrates. Then, the silvery substrates were used as the SERS substrates to detect vibrational modes of phenylalanine amino acid up to the concentration of 10 -7 M. The importance of phenylalanine amino acid detection is due to the early diagnosis of phenylketonuria in neonates. Therefore, the blood plasma of a healthy neonate and a neonate with phenylketonuria disease were adsorbed on the SERS substrates. They enhance the intensity of molecular vibration peaks of phenylalanine amino acid of two kinds of blood plasmas. The intensities of molecular vibrations of unhealthy plasma are stronger than healthy plasma due to the higher concentrations of phenylalanine amino acid, which is the sign of Phenylketonuria disease.","PeriodicalId":19554,"journal":{"name":"Optics and Photonics Society of Iran","volume":null,"pages":null},"PeriodicalIF":0.0,"publicationDate":"2019-03-10","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"79389532","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Pub Date : 2016-03-10DOI: 10.18869/ACADPUB.IJOP.11.2.79
M. Jalali, H. Nadgaran, D. Erni
In this paper a novel antireflection (AR) coating based on silicon nanobars is designed and its impact on the performance of crystalline silicon (c-Si) thinfilm solar cells is extensively studied. Silicon nano-bars with optimized size and period are embedded on top of the active layer, under a 100nm Si3N4 layer. As a result of the proposed layer stack, an inhomogeneous intermediate layer with effective refractive index amid the two layers is formed and a graded refractive index AR coating is achieved, which has a substantial effect on broad, omnidirectional reduction of the reflection spectra. To validate our claim, the proposed structure as well as four conventional AR coatings are simulated and through the numerical analysis of both the spectral response of the reflection factor and the silicon active layer absorption spectra, it is shown that the proposed design outperforms conventional already existing AR coatings, and in addition provides a strong coupling of the incident light to the active layer, while improving the overall efficiency of the thin-film
{"title":"Design of Silicon Nano-bars Anti-Reflection Coating to Enhance Thin Film Solar Cells Efficiency","authors":"M. Jalali, H. Nadgaran, D. Erni","doi":"10.18869/ACADPUB.IJOP.11.2.79","DOIUrl":"https://doi.org/10.18869/ACADPUB.IJOP.11.2.79","url":null,"abstract":"In this paper a novel antireflection (AR) coating based on silicon nanobars is designed and its impact on the performance of crystalline silicon (c-Si) thinfilm solar cells is extensively studied. Silicon nano-bars with optimized size and period are embedded on top of the active layer, under a 100nm Si3N4 layer. As a result of the proposed layer stack, an inhomogeneous intermediate layer with effective refractive index amid the two layers is formed and a graded refractive index AR coating is achieved, which has a substantial effect on broad, omnidirectional reduction of the reflection spectra. To validate our claim, the proposed structure as well as four conventional AR coatings are simulated and through the numerical analysis of both the spectral response of the reflection factor and the silicon active layer absorption spectra, it is shown that the proposed design outperforms conventional already existing AR coatings, and in addition provides a strong coupling of the incident light to the active layer, while improving the overall efficiency of the thin-film","PeriodicalId":19554,"journal":{"name":"Optics and Photonics Society of Iran","volume":null,"pages":null},"PeriodicalIF":0.0,"publicationDate":"2016-03-10","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"91366507","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Pub Date : 2014-02-15DOI: 10.1017/S0263034614000184
N. S. Javan, M. Hosseinpoor
Self-focusing of circularly-polarized electromagnetic wave has been investigated in the hot magnetized electronpositron -ion plasma. It is observed that difference in the temperature of electron and positron have a significant effect on the behavior of self-focusing, when the density of electron slightly exceeds density of positron.
{"title":"Thermal behavior change in the self-focusing of an intense laser beam in the magnetized electron-ion-positron plasma","authors":"N. S. Javan, M. Hosseinpoor","doi":"10.1017/S0263034614000184","DOIUrl":"https://doi.org/10.1017/S0263034614000184","url":null,"abstract":"Self-focusing of circularly-polarized electromagnetic wave has been investigated in the hot magnetized electronpositron -ion plasma. It is observed that difference in the temperature of electron and positron have a significant effect on the behavior of self-focusing, when the density of electron slightly exceeds density of positron.","PeriodicalId":19554,"journal":{"name":"Optics and Photonics Society of Iran","volume":null,"pages":null},"PeriodicalIF":0.0,"publicationDate":"2014-02-15","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"81653858","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Pub Date : 2014-02-15DOI: 10.18869/ACADPUB.IJPR.15.1.105
parisa ghahremani nezhad, M. R. R. Abadi, M. Behdani, ahmad amir abadi zade, M. Mohammadi
- We have deposited Fe/Ag/Co multilayer by physical vapor deposition (PVD)method in different Ag thickness as spacer working in a vacuum of 2×10 -6 mbar. The structural properties , magnetic response of the samples at low temperatures and room temperature was investigated by XRD, physical properties measurement system (PPMS) and vibrating sample magnetometer (VSM) respectively. Hysteresis loops show that the easy axis of magnetization is in plane of the film . Magnetic measurements show dependence of exchange coupling as a pattern of Ag thickness as spacer. magnetic moment shows increasing with decrease of spacer thickness. Also the magnetization and Hc of samples decrease with increasing temperature.
{"title":"structural and magnetic properties of Fe(20Å) /Ag(xÅ)/Co(20Å) hetro-multilayers","authors":"parisa ghahremani nezhad, M. R. R. Abadi, M. Behdani, ahmad amir abadi zade, M. Mohammadi","doi":"10.18869/ACADPUB.IJPR.15.1.105","DOIUrl":"https://doi.org/10.18869/ACADPUB.IJPR.15.1.105","url":null,"abstract":"- We have deposited Fe/Ag/Co multilayer by physical vapor deposition (PVD)method in different Ag thickness as spacer working in a vacuum of 2×10 -6 mbar. The structural properties , magnetic response of the samples at low temperatures and room temperature was investigated by XRD, physical properties measurement system (PPMS) and vibrating sample magnetometer (VSM) respectively. Hysteresis loops show that the easy axis of magnetization is in plane of the film . Magnetic measurements show dependence of exchange coupling as a pattern of Ag thickness as spacer. magnetic moment shows increasing with decrease of spacer thickness. Also the magnetization and Hc of samples decrease with increasing temperature.","PeriodicalId":19554,"journal":{"name":"Optics and Photonics Society of Iran","volume":null,"pages":null},"PeriodicalIF":0.0,"publicationDate":"2014-02-15","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"83363680","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
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