Europe Optics + Optoelectronics最新文献

Achieving zero stress in iridium, chromium, and nickel thin films 在铱、铬和镍薄膜中实现零应力

Europe Optics + Optoelectronics Pub Date : 2015-08-09 DOI: 10.1117/12.2180641

D. Broadway, J. Weimer, D. Gurgew, T. Lis, B. Ramsey, S. O’Dell, M. Gubarev, A. Ames, R. Bruni

{"title":"Achieving zero stress in iridium, chromium, and nickel thin films","authors":"D. Broadway, J. Weimer, D. Gurgew, T. Lis, B. Ramsey, S. O’Dell, M. Gubarev, A. Ames, R. Bruni","doi":"10.1117/12.2180641","DOIUrl":"https://doi.org/10.1117/12.2180641","url":null,"abstract":"We examine a method for achieving zero intrinsic stress in thin films of iridium, chromium, and nickel deposited by magnetron sputter deposition. The examination of the stress in these materials is motivated by efforts to advance the optical performance of light-weight x-ray space telescopes into the regime of sub-arc second resolution. A characteristic feature of the intrinsic stress behavior in chromium and nickel is their sensitivity to the magnitude and sign of the intrinsic stress with argon gas pressure, including the existence of a critical pressure that results in zero film stress. This critical pressure scales linearly with the film’s density. While the effect of stress reversal with argon pressure has been previously reported by Hoffman and others for nickel and chromium, we have discovered a similar behavior for the intrinsic stress in iridium films. Additionally, we have identified zero stress in iridium shortly after island coalescence in the high adatom mobility growth regime. This feature of film growth is used for achieving a total internal stress of -2.89 MPa for a 15.8 nm thick iridium film with a surface roughness of 5.0 ± 0.5Å based on x-ray reflectivity (XRR) measurement at CuKα. The surface topography was also examined using atomic force microscopy (AFM). The examination of the stress in these films has been performed with a novel in-situ measurement device. The methodology and sensitivity of the in-situ instrument is also described herein.","PeriodicalId":347374,"journal":{"name":"Europe Optics + Optoelectronics","volume":"76 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2015-08-09","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"127639603","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}

引用次数: 36

Bunch modulation in LWFA blowout regime LWFA井喷状态下的束调制

Europe Optics + Optoelectronics Pub Date : 2015-06-03 DOI: 10.1117/12.2178808

J. Vyskočil, O. Klimo, J. Vieira, G. Korn

引用次数: 0

Numerical investigations on a compact magnetic fusion device for studying the effect of external applied magnetic field oscillations on the nuclear burning efficiency of D-T and p-11B fuels 在小型磁聚变装置上研究外加磁场振荡对D-T和p-11B燃料核燃烧效率的影响

Europe Optics + Optoelectronics Pub Date : 2015-06-02 DOI: 10.1117/12.2182402

S. Moustaizis, P. Lalousis, H. Hora, J. Larour, P. Auvray, P. Balcou, J. Ducret, P. Martin

{"title":"Numerical investigations on a compact magnetic fusion device for studying the effect of external applied magnetic field oscillations on the nuclear burning efficiency of D-T and p-11B fuels","authors":"S. Moustaizis, P. Lalousis, H. Hora, J. Larour, P. Auvray, P. Balcou, J. Ducret, P. Martin","doi":"10.1117/12.2182402","DOIUrl":"https://doi.org/10.1117/12.2182402","url":null,"abstract":"The burning process of high density (about 1018cm-3), high temperature (tens to hundreds of keV) plasma trapped by a high mirror-like magnetic field in a Compact Magnetic Fusion (CMF) device is numerically investigated.. The initial high density and high temperature plasma in the CMF device is produced by ultrashort high intensity laser beam interaction with clusters or thin foils, and two fuels, D-T and p-11B are studied. The spatio-temporal evolution of D-T and p-11B plasmas, the production of alphas, the generated electric fields and the high external applied magnetic field are described by a 1-D multifluid code. The initial values for the plasma densities, temperatures and external applied magnetic field (about 100 T) correspond to high β plasmas. The main objectives of the numerical simulations are: to study the plasma trapping, the neutron and alpha production for both fuels, and compare the effect of the external applied magnetic field on the nuclear burning efficiency for the two fuels.. The comparisons and the advantages for each fuel will be presented. The proposed CMF device and the potential operation of the device within the ELI-NP pillar will be discussed.","PeriodicalId":347374,"journal":{"name":"Europe Optics + Optoelectronics","volume":"173 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2015-06-02","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"116191076","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}

引用次数: 2

Super-radiant high-field THz sources operating at quasi-cw rep rates 以准连续波代表率工作的超辐射高场太赫兹源

Europe Optics + Optoelectronics Pub Date : 2015-06-01 DOI: 10.1117/12.2182417

S. Kovalev, B. Green, M. Gensch

引用次数: 0

Temperature controlled optical resonator process for optoelectronic oscillator application 温控光谐振器工艺在光电振荡器中的应用

Europe Optics + Optoelectronics Pub Date : 2015-05-20 DOI: 10.1117/12.2178461

M. Zarubin, P. Salzenstein

引用次数: 2

Optimization of dipole structures for detection of organic compounds 有机化合物偶极子结构的优化检测

Europe Optics + Optoelectronics Pub Date : 2015-05-19 DOI: 10.1117/12.2182278

Henrique Vilhena, S. McMeekin, A. S. Holmes-Smith, N. Johnson

{"title":"Optimization of dipole structures for detection of organic compounds","authors":"Henrique Vilhena, S. McMeekin, A. S. Holmes-Smith, N. Johnson","doi":"10.1117/12.2182278","DOIUrl":"https://doi.org/10.1117/12.2182278","url":null,"abstract":"Metamaterials are being increasingly used as highly sensitive detection devices. The design of these structures and the ability to effect changes in response through small changes in the geometry of their constituent elements allow for the enhancement of known analysis techniques such as infrared or Raman spectroscopy. High electromagnetic fields have been shown to occur in features such as small gaps and sharp tips and these so called “hot-spots” are the main focus of recent work in Surface Enhanced Raman Spectroscopy (SERS). Previous work has shown dipole pairs with small gaps between them to be suitable for the SERS detection of very small amounts of organic compounds. The main difficulties lie in the small dimensions (≤100 nm) necessary to attain a significant response at the typical Raman pump wavelengths. Also the small size of the gaps is a challenge when it comes to prevent “bridging” between the structures during the fabrication process. In this work we show, through simulations, that carefully controlling the length of dipolar structures as well as the gap between these dipoles a resonant response can be achieved close to the pump Raman wavelengths. Also, we see that increasing the width of the dipole pair shifts the resonant peaks to longer wavelengths. By optimizing their geometry, more efficient and easier to fabricate structures can be used as environmental organic sensors.","PeriodicalId":347374,"journal":{"name":"Europe Optics + Optoelectronics","volume":"418 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2015-05-19","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"122773358","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}

引用次数: 1

Symmetry breaking in the second harmonic field of self-assembled metallic nanostructures 自组装金属纳米结构二次谐波场对称性破缺

Europe Optics + Optoelectronics Pub Date : 2015-05-19 DOI: 10.1117/12.2182759

A. Belardini, A. Benedetti, M. Centini, E. Fazio, M. Bertolotti, C. Sibilia, J. Haus, A. Sarangan

{"title":"Symmetry breaking in the second harmonic field of self-assembled metallic nanostructures","authors":"A. Belardini, A. Benedetti, M. Centini, E. Fazio, M. Bertolotti, C. Sibilia, J. Haus, A. Sarangan","doi":"10.1117/12.2182759","DOIUrl":"https://doi.org/10.1117/12.2182759","url":null,"abstract":"Here we present both an overview of different nonlinear optical phenomena occurring in nanopatterned materials and new results on the symmetry induced second harmonic generation (SHG) signal from metallic nanowires. A discussion about symmetry breaking in artificial chiral metamaterials is presented, while the experimental evidence was given by second order nonlinear optical measurements on different samples. Here, new SHG measurements on regular array of tilted nanowires (NWs) produced by grazing evaporating gold on a silicon substrate were presented and discussed. The surface composed by tilted wires can induce an optical chiral response of the whole sample when the light impinges on the sample on an out-of-normal incidence angle (extrinsic chirality). The measurements were performed by using circular polarised laser excitation at the wavelength of 800nm and by observing the second harmonic response at the wavelength of 400nm in different polarization states. The second harmonic generation process results to be very sensitive to the symmetry breaking at the interfaces of investigated samples.","PeriodicalId":347374,"journal":{"name":"Europe Optics + Optoelectronics","volume":"84 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2015-05-19","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"127850566","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}

引用次数: 1

Y-Ba-Cu-O nanostripes for optical photon detection 用于光光子探测的Y-Ba-Cu-O纳米条纹

Europe Optics + Optoelectronics Pub Date : 2015-05-19 DOI: 10.1117/12.2179677

G. Pepe, L. Parlato, M. Ejrnaes, R. Cristiano, R. Arpaia, F. Tafuri, D. Golubev, T. Bauch, F. Lombardi, R. Sobolewski

引用次数: 0

Second harmonic generation from artificial metasurfaces 人工超表面产生二次谐波

Europe Optics + Optoelectronics Pub Date : 2015-05-19 DOI: 10.1117/12.2185310

A. Belardini, A. Benedetti, M. Bertolotti, M. Centini, C. Sibilia

引用次数: 0

Synchronously pumped femtosecond optical parametric oscillator with broadband chirped mirrors 带宽带啁啾反射镜的同步泵浦飞秒光学参量振荡器

Europe Optics + Optoelectronics Pub Date : 2015-05-18 DOI: 10.1117/12.2178468

K. Stankevičiūtė, Simas Melnikas, S. Kicas, Lukas Trišauskas, J. Vengelis, R. Grigonis, M. Vengris, V. Sirutkaitis

引用次数: 1