Pub Date : 2012-05-21DOI: 10.1109/SOPO.2012.6270521
G. Liu, L. Li, Y. Chen, K. Huang, L. Gong, F. Tang
Gold nanoparticle arrays are fabricated for surface-enhanced Raman scattering (SERS) and the effect of experimental parameters such as annealing temperature and array thickness of nanoparticles on the SERS signals are investigated. The particle distribution and particle size are dense and uniform on the glass substrate when the 10nm gold film was annealed at 270°C and strong SERS signals for Rhodamine 6G were achieved via the 532 nm excitation. The SERS signal at 1650 cm-1 is enhanced more than 6 times as compared to that of the gold film without annealing. The strong SERS behavior of gold nanoparticle arrays may broaden the SERS applications in biomedical and analytical chemistry.
{"title":"Influence of Experimental Parameters on the Surface-Enhanced Raman Scattering via Gold Nanoparticle Arrays","authors":"G. Liu, L. Li, Y. Chen, K. Huang, L. Gong, F. Tang","doi":"10.1109/SOPO.2012.6270521","DOIUrl":"https://doi.org/10.1109/SOPO.2012.6270521","url":null,"abstract":"Gold nanoparticle arrays are fabricated for surface-enhanced Raman scattering (SERS) and the effect of experimental parameters such as annealing temperature and array thickness of nanoparticles on the SERS signals are investigated. The particle distribution and particle size are dense and uniform on the glass substrate when the 10nm gold film was annealed at 270°C and strong SERS signals for Rhodamine 6G were achieved via the 532 nm excitation. The SERS signal at 1650 cm-1 is enhanced more than 6 times as compared to that of the gold film without annealing. The strong SERS behavior of gold nanoparticle arrays may broaden the SERS applications in biomedical and analytical chemistry.","PeriodicalId":159850,"journal":{"name":"2012 Symposium on Photonics and Optoelectronics","volume":"66 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2012-05-21","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"131078684","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 : 2012-05-21DOI: 10.1109/SOPO.2012.6270453
Wensheng Wei, Congliang Zhang, Feng Shan
Photovoltaic cell with superstrate structure of (p+)a-SiC:H/buffer/(i)a-Si:H/(n+)a-Si:H was optimized and cell performance was analyzed by a numerical software of one-dimensional device simulation program of analysis of microelectronic and photonic structures (AMPS-1D) in this paper. The consanguineous relations between current-voltage characteristics, charge transport, heterojunction band offset and performance to the p/i interface defective states were elucidated. The results indicate that the performance shows sensitive to cell structures and material interface defective states. The optimum conversion efficiency coincides to a suitable thickness of optical absorption layer. Interface defective states especially those in p/i region can serious limit the open circuit voltage and full factor. Inserting an applicable buffer layer at p/i interface to alleviate interface states can improve the performance of studied photovoltaic cells.
{"title":"Interface Defective Effect on Performance of (p+)µc-SiC:H/(i)a-Si:H/(n+)a-Si:H Solar Cells","authors":"Wensheng Wei, Congliang Zhang, Feng Shan","doi":"10.1109/SOPO.2012.6270453","DOIUrl":"https://doi.org/10.1109/SOPO.2012.6270453","url":null,"abstract":"Photovoltaic cell with superstrate structure of (p+)a-SiC:H/buffer/(i)a-Si:H/(n+)a-Si:H was optimized and cell performance was analyzed by a numerical software of one-dimensional device simulation program of analysis of microelectronic and photonic structures (AMPS-1D) in this paper. The consanguineous relations between current-voltage characteristics, charge transport, heterojunction band offset and performance to the p/i interface defective states were elucidated. The results indicate that the performance shows sensitive to cell structures and material interface defective states. The optimum conversion efficiency coincides to a suitable thickness of optical absorption layer. Interface defective states especially those in p/i region can serious limit the open circuit voltage and full factor. Inserting an applicable buffer layer at p/i interface to alleviate interface states can improve the performance of studied photovoltaic cells.","PeriodicalId":159850,"journal":{"name":"2012 Symposium on Photonics and Optoelectronics","volume":"1 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2012-05-21","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"131124997","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 : 2012-05-21DOI: 10.1109/SOPO.2012.6270939
Wei Nai, Decun Dong, Xiaoming Hu, Xin Wang
This paper proposes a long-haul CATV system designing scheme with Erbium doped fiber amplifier (EDFA) and Raman fiber amplifier (RFA) cascaded in the transmission link. The scheme deploys a EDFA as forward pumping in order to utilize its large gain and the quality of ensuring high carrier-to-noise ratio (CNR), and deploys a RFA as backward pumping so as to utilize its distributed structure to get lower nonlinear indices including composite second order (CSO) and composite triple beat (CTB) distortion. Experiment designed in this paper has shown that the scheme proposed can not only ensure CNR in a high level thus ensure the clarity of TV image, but effectively control nonlinear effects so as to avoid TV channel overlapping as well.
{"title":"Improving Nonlinear Effects by Cascading EDFA and RFA in Long-Haul CATV Transmission Link","authors":"Wei Nai, Decun Dong, Xiaoming Hu, Xin Wang","doi":"10.1109/SOPO.2012.6270939","DOIUrl":"https://doi.org/10.1109/SOPO.2012.6270939","url":null,"abstract":"This paper proposes a long-haul CATV system designing scheme with Erbium doped fiber amplifier (EDFA) and Raman fiber amplifier (RFA) cascaded in the transmission link. The scheme deploys a EDFA as forward pumping in order to utilize its large gain and the quality of ensuring high carrier-to-noise ratio (CNR), and deploys a RFA as backward pumping so as to utilize its distributed structure to get lower nonlinear indices including composite second order (CSO) and composite triple beat (CTB) distortion. Experiment designed in this paper has shown that the scheme proposed can not only ensure CNR in a high level thus ensure the clarity of TV image, but effectively control nonlinear effects so as to avoid TV channel overlapping as well.","PeriodicalId":159850,"journal":{"name":"2012 Symposium on Photonics and Optoelectronics","volume":"27 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2012-05-21","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"133794042","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 : 2012-05-21DOI: 10.1109/SOPO.2012.6271006
Weiping Zhou, Furong Liu, Chao He, Jimin Chen
In this paper, a novel method of fabricate lead-free piezoelectric sodium potassium niobate [(K,Na)NbO3,KNN] thin films was proposed. The KNN thin films were directly sintered on glass substrate at room temperature by pulsed laser. And all of the steps do not need vacuum conditions. Compared with conventional preparation techniques, such as RF-magnetron sputtering and metal-organic chemical vapor deposition (MOCVD), this method is more simpler and faster. The surface morphology of KNN thin film was observed with scanning electron microscopy (SEM), phase composition and structure were characterized by X-ray diffraction (XRD). These results indicate that the KNN thin film was succeeded fabricated by the method.
{"title":"Fabrication of Na0.5K0.5NbO3 Thin Film on Glass Substrate by Pulsed Laser at Room Temperature","authors":"Weiping Zhou, Furong Liu, Chao He, Jimin Chen","doi":"10.1109/SOPO.2012.6271006","DOIUrl":"https://doi.org/10.1109/SOPO.2012.6271006","url":null,"abstract":"In this paper, a novel method of fabricate lead-free piezoelectric sodium potassium niobate [(K,Na)NbO3,KNN] thin films was proposed. The KNN thin films were directly sintered on glass substrate at room temperature by pulsed laser. And all of the steps do not need vacuum conditions. Compared with conventional preparation techniques, such as RF-magnetron sputtering and metal-organic chemical vapor deposition (MOCVD), this method is more simpler and faster. The surface morphology of KNN thin film was observed with scanning electron microscopy (SEM), phase composition and structure were characterized by X-ray diffraction (XRD). These results indicate that the KNN thin film was succeeded fabricated by the method.","PeriodicalId":159850,"journal":{"name":"2012 Symposium on Photonics and Optoelectronics","volume":"138 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2012-05-21","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"115352996","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 : 2012-05-21DOI: 10.1109/SOPO.2012.6270480
Ying He, Yujun Zhang, Ruifeng Kan, Li-ming Wang, Kun You, Jianguo Liu
Fast, accurate, real-time measurement of gas concentration is an important task for preventing the coal mining disaster. Combining tunable diode laser absorption spectroscopy (TDLAS) technique with distributed fiber sensing technique, a multipoint fiber optic sensors system for gas monitoring is designed. The wavelength modulation technique and harmonic detection techniques are used to obtain the necessary sensitivity. Simulating experiment is carried out, and the influence of the laser intensity fluctuation for measurement is eliminated by I2f/I0. The detective limit of the system is below 0.05%, the time resolution is 1s. The system offers a simple, intrinsically safe design with fiber optic sensors head, and carries out real-time, fast, continuous and non-intrusive measurement which meets the requirements of coal mining gas monitoring.
{"title":"Study on Mash Gas Monitoring with Distributed Multipoint Fiber Optic Sensors System in Coal Mine","authors":"Ying He, Yujun Zhang, Ruifeng Kan, Li-ming Wang, Kun You, Jianguo Liu","doi":"10.1109/SOPO.2012.6270480","DOIUrl":"https://doi.org/10.1109/SOPO.2012.6270480","url":null,"abstract":"Fast, accurate, real-time measurement of gas concentration is an important task for preventing the coal mining disaster. Combining tunable diode laser absorption spectroscopy (TDLAS) technique with distributed fiber sensing technique, a multipoint fiber optic sensors system for gas monitoring is designed. The wavelength modulation technique and harmonic detection techniques are used to obtain the necessary sensitivity. Simulating experiment is carried out, and the influence of the laser intensity fluctuation for measurement is eliminated by I2f/I0. The detective limit of the system is below 0.05%, the time resolution is 1s. The system offers a simple, intrinsically safe design with fiber optic sensors head, and carries out real-time, fast, continuous and non-intrusive measurement which meets the requirements of coal mining gas monitoring.","PeriodicalId":159850,"journal":{"name":"2012 Symposium on Photonics and Optoelectronics","volume":"23 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2012-05-21","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"115428678","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 : 2012-05-21DOI: 10.1109/SOPO.2012.6270952
H. Liang, Yong-xing Jin, Jian-feng Wang, Yu Zhao
A relative humidity sensor based on two polarization maintaining fibers loop mirror with temperature compensation is presented. The proposed sensors are created through coating a thin layer of polyvinyl alcohol (PVA) onto a polarization maintaining fiber (PMF1) from which a portion of the cladding is etched. The relative humidity optical fiber sensor which shows a linear response to parameter and compensates for temperature is tested with different surrounding humidity level from 20% to 80%. The sensitivity of the relative humidity measurement of 0.98nm/%RH and the temperature sensitivity of -0.323nm/°C is experimentally achieved.
{"title":"Temperature-Independent Humidity Sensor Based on Polarization Maintaining Fiber Loop Mirror","authors":"H. Liang, Yong-xing Jin, Jian-feng Wang, Yu Zhao","doi":"10.1109/SOPO.2012.6270952","DOIUrl":"https://doi.org/10.1109/SOPO.2012.6270952","url":null,"abstract":"A relative humidity sensor based on two polarization maintaining fibers loop mirror with temperature compensation is presented. The proposed sensors are created through coating a thin layer of polyvinyl alcohol (PVA) onto a polarization maintaining fiber (PMF1) from which a portion of the cladding is etched. The relative humidity optical fiber sensor which shows a linear response to parameter and compensates for temperature is tested with different surrounding humidity level from 20% to 80%. The sensitivity of the relative humidity measurement of 0.98nm/%RH and the temperature sensitivity of -0.323nm/°C is experimentally achieved.","PeriodicalId":159850,"journal":{"name":"2012 Symposium on Photonics and Optoelectronics","volume":"23 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2012-05-21","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"115744886","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 : 2012-05-21DOI: 10.1109/SOPO.2012.6270451
Puyao Wang, Zhi Liu
In the free space optical communication (FSO), the optical signals transmitted in the open air link. Inevitably, the signal received are influenced by atmosphere disturbance noise, so the reliability of FSO system is reduced. The present paper analyzed the principle of modulation and demodulation of PolSK and studied its main properties, then analyzed the performance of communication system by simulation experiments.
{"title":"The Analysis of Methods and Performance of Atmospheric Laser Communication Based on Polarization Shift Keying Modulation (PolSK) Technology","authors":"Puyao Wang, Zhi Liu","doi":"10.1109/SOPO.2012.6270451","DOIUrl":"https://doi.org/10.1109/SOPO.2012.6270451","url":null,"abstract":"In the free space optical communication (FSO), the optical signals transmitted in the open air link. Inevitably, the signal received are influenced by atmosphere disturbance noise, so the reliability of FSO system is reduced. The present paper analyzed the principle of modulation and demodulation of PolSK and studied its main properties, then analyzed the performance of communication system by simulation experiments.","PeriodicalId":159850,"journal":{"name":"2012 Symposium on Photonics and Optoelectronics","volume":"33 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2012-05-21","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"114359809","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 : 2012-05-21DOI: 10.1109/SOPO.2012.6270525
Yonggang Li, Longjiang Li
By applying the idea of artificial immune system, we aims to solve the static traffic grooming problem in WDM mesh network in this paper. The novel immune algorithm we propose is to minimize the number of transceivers while the network is light and to carry more connection requests while the network is heavy. Our algorithm differs from other existing intelligent algorithm in that it uses less transceiver and carries more traffic. Through the simulation results, our novel algorithm achieves better network performance than others.
{"title":"Static Traffic Grooming in WDM Network Using Artificial Immune Algorithm","authors":"Yonggang Li, Longjiang Li","doi":"10.1109/SOPO.2012.6270525","DOIUrl":"https://doi.org/10.1109/SOPO.2012.6270525","url":null,"abstract":"By applying the idea of artificial immune system, we aims to solve the static traffic grooming problem in WDM mesh network in this paper. The novel immune algorithm we propose is to minimize the number of transceivers while the network is light and to carry more connection requests while the network is heavy. Our algorithm differs from other existing intelligent algorithm in that it uses less transceiver and carries more traffic. Through the simulation results, our novel algorithm achieves better network performance than others.","PeriodicalId":159850,"journal":{"name":"2012 Symposium on Photonics and Optoelectronics","volume":"40 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2012-05-21","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"117189050","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 : 2012-05-21DOI: 10.1109/SOPO.2012.6270469
J. Gurell, P. Lundin, M. Falkenström, A. Bengtson, B. Noharet
A setup for fast and remote elemental analysis of metallic scrap pieces is under development. The setup uses laser-induced breakdown spectroscopy in order to classify scrap pieces with the purpose of providing a better analysis and enabling sorting of recyclable metals.
{"title":"Fast and Remote Analysis of Metals for Efficient Recycling - A Laser Spectroscopic Setup for Automated Analysis of Metallic Scrap Pieces","authors":"J. Gurell, P. Lundin, M. Falkenström, A. Bengtson, B. Noharet","doi":"10.1109/SOPO.2012.6270469","DOIUrl":"https://doi.org/10.1109/SOPO.2012.6270469","url":null,"abstract":"A setup for fast and remote elemental analysis of metallic scrap pieces is under development. The setup uses laser-induced breakdown spectroscopy in order to classify scrap pieces with the purpose of providing a better analysis and enabling sorting of recyclable metals.","PeriodicalId":159850,"journal":{"name":"2012 Symposium on Photonics and Optoelectronics","volume":"32 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2012-05-21","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"115992177","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}
A simple method for determining phase retardation and fast axis of a wave plate by using two-intensity measuring method is presented. In order to eliminate the influence of light source, double optical path method is adopted. In the first optical path, the wave plate is sandwiched between a polarizer and an analyzer, and the wave plate can be placed at any initial fast axis direction. A detector behind the analyzer is used to measure the output light intensity. In the second optical path, another detector is used to monitor the light intensity fluctuation. With rotation of the wave plate, the two-point intensity, maximum and minimum output light intensity, and the rotation angle at the first extreme point are measured in the first optical path. At the same time, in the second optical path the corresponding light intensity are detected. Base on the two-intensity and the rotation angle in the first optical path and the light intensity in the second optical path, the phase retardation and fast axis of the wave plate can be determined simultaneously. The advantage of this method is its simplicity of implementation, low cost, better accuracy and easier operation. We believe that the method reported in this paper should be a useful approach for measurement of a wave plate without the need to use complex and expensive apparatus.
{"title":"Two-Intensity Measurement Method for Determining the Fast Axis and Phase Retardation of a Wave Plate","authors":"Wei Wang, Zhiqiang Liang, Chang Li, Yanyan Yin, Shiliang Wu","doi":"10.1109/SOPO.2012.6270565","DOIUrl":"https://doi.org/10.1109/SOPO.2012.6270565","url":null,"abstract":"A simple method for determining phase retardation and fast axis of a wave plate by using two-intensity measuring method is presented. In order to eliminate the influence of light source, double optical path method is adopted. In the first optical path, the wave plate is sandwiched between a polarizer and an analyzer, and the wave plate can be placed at any initial fast axis direction. A detector behind the analyzer is used to measure the output light intensity. In the second optical path, another detector is used to monitor the light intensity fluctuation. With rotation of the wave plate, the two-point intensity, maximum and minimum output light intensity, and the rotation angle at the first extreme point are measured in the first optical path. At the same time, in the second optical path the corresponding light intensity are detected. Base on the two-intensity and the rotation angle in the first optical path and the light intensity in the second optical path, the phase retardation and fast axis of the wave plate can be determined simultaneously. The advantage of this method is its simplicity of implementation, low cost, better accuracy and easier operation. We believe that the method reported in this paper should be a useful approach for measurement of a wave plate without the need to use complex and expensive apparatus.","PeriodicalId":159850,"journal":{"name":"2012 Symposium on Photonics and Optoelectronics","volume":"84 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2012-05-21","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"116465992","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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