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Optical and terahertz spectroscopy of doped GaAs/AlAs quantum wells 掺杂GaAs/AlAs量子阱的光学和太赫兹光谱
International Conference on Advanced Optical Materials and Devices Pub Date : 2006-02-19 DOI: 10.1117/12.726406
G. Valušis, Julius Kavaliauskas, B. Čechavičius, Genė Krivaitė, D. Seliuta, Ben Sherliker, M. Halsall, P. Harrison, S. Khanna, E. Linfield
{"title":"Optical and terahertz spectroscopy of doped GaAs/AlAs quantum wells","authors":"G. Valušis, Julius Kavaliauskas, B. Čechavičius, Genė Krivaitė, D. Seliuta, Ben Sherliker, M. Halsall, P. Harrison, S. Khanna, E. Linfield","doi":"10.1117/12.726406","DOIUrl":"https://doi.org/10.1117/12.726406","url":null,"abstract":"We present comprehensive experimental study of p-type (Be) and n-type (Si) &dgr;-doped GaAs/AlAs multiple quantum wells (QWs) intended to be used as selective sensors/emitters in terahertz (THz) range. The structures of various designs and doping levels were studied via different optical-photoreflectance-, surface photovoltage- and differential surface photovoltage. spectroscopies and a THz photocurrent technique using as THz emission source either free electron- or optically-pumped molecular THz laser within 4.300 K range of temperatures. Analysis of Franz-Keldysh oscillations in photoreflectance spectra and line shapes of the differential surface photovoltage spectra enabled to estimate built-in electric fields and excitonic parameters for a large number of QW subbands. The experimental interband transition energies were compared with calculations performed within the envelope function approximation taking into account non-parabolicity of the energy bands. The dominant exciton line broadening mechanisms were revealed, and the interface roughness was evaluated from analysis of the dependence of exciton linewidth broadening on the QW width. Terahertz spectroscopic measurements in p-type structures have indicated strong absorption around 55 &mgr;m wavelength due to intraband absorption of the bound holes, while increase in photocurrent in the structures below 80 &mgr;m wavelength is caused by photothermal ionization of Be acceptors.","PeriodicalId":273853,"journal":{"name":"International Conference on Advanced Optical Materials and Devices","volume":"33 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2006-02-19","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"129488533","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: 0
Differences and likenesses between demands to media intended for image and hologram recording 用于图像和全息记录的媒体需求之间的差异和相似性
International Conference on Advanced Optical Materials and Devices Pub Date : 2006-02-19 DOI: 10.1117/12.726368
A. Peckus, B. Gurevich, S. Gurevich
{"title":"Differences and likenesses between demands to media intended for image and hologram recording","authors":"A. Peckus, B. Gurevich, S. Gurevich","doi":"10.1117/12.726368","DOIUrl":"https://doi.org/10.1117/12.726368","url":null,"abstract":"The difference between conditions of image and hologram recording is determined by the fact that in the first case the light intensity spatial distribution whereas in the second case the light wave amplitude and phase distribution is recorded. Also multiplexing is possible for the hologram recording, which increases significantly the informative capabilities of the recording. The phase recording possibility allows to create several new classes of recording media. In order to improve the media successfully, it is necessary to understand correctly the demands to them which are discussed below.","PeriodicalId":273853,"journal":{"name":"International Conference on Advanced Optical Materials and Devices","volume":"18 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2006-02-19","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"134193375","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: 0
Formation of carbon coatings employing plasma torch from argon-acetylene gas mixture 用等离子炬从氩气-乙炔气体混合物中形成碳涂层
International Conference on Advanced Optical Materials and Devices Pub Date : 2006-02-19 DOI: 10.1117/12.726511
L. Marcinauskas, A. Grigonis, P. Valatkevičius, V. Šablinskas
{"title":"Formation of carbon coatings employing plasma torch from argon-acetylene gas mixture","authors":"L. Marcinauskas, A. Grigonis, P. Valatkevičius, V. Šablinskas","doi":"10.1117/12.726511","DOIUrl":"https://doi.org/10.1117/12.726511","url":null,"abstract":"Amorphous carbon films were formed on Si (111) wafers from argon-acetylene gas mixture at atmospheric pressure by direct current (DC) plasma torch discharge. The Ar/C2H2 gas volume ratio varied from 12 to 100, and the distance between plasma torch nozzle exit and the samples was 0.005, 0.01 and 0.02 m. SEM revealed carbon coatings thickness in the range of 20-270 &mgr;m, and variation of the growth rate from 0.067 &mgr;m/s to 1.5 &mgr;m/s. Growth rate of the coatings increases decreasing Ar/C2H2 gas ratio and the distance. The Raman spectra of carbon films indicate the upward shift of the D (~1360 cm-1) and G (~1600 cm-1) peaks, compared to typical diamond-like carbon (DLC). a-C:H coatings deposited at higher Ar/C2H2 gas ratio (60 and 100) and distance d greater than or equal to 0.01 m contain high sp3 bond fraction and are attributed to DLC films. However Raman spectra shape and ID/IG ratio demonstrate existence of diamond phase mixed with glassy carbon phase. Films produced at lower Ar/C2H2 ratios are graphite-like carbon (GLC). The Fourier transform infrared (FTIR) spectroscopy has shown that film transparency increases decreasing acetylene gas content. Reflectance of the films depends on Ar/C2H2 gas ratio and distance, and varies from 60% up to 90%. The IR spectra showed clear evidence of C=C and C=O bonds in GLC films and presence of sp3 CH2 symmetric (2850 cm-1) and antisymmetric (2920 cm-1) modes in DLC coatings.","PeriodicalId":273853,"journal":{"name":"International Conference on Advanced Optical Materials and Devices","volume":"17 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2006-02-19","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"132739513","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: 4
Stimulated emission and optical gain in nitride-based compounds and quantum structures 氮基化合物和量子结构中的受激发射和光增益
International Conference on Advanced Optical Materials and Devices Pub Date : 2006-02-19 DOI: 10.1117/12.726357
E. Kuokštis, V. Liuolia, S. Miasojedovas, S. Juršėnas, A. Zukauskas, M. Leszczynski, P. Perlin, T. Suski
{"title":"Stimulated emission and optical gain in nitride-based compounds and quantum structures","authors":"E. Kuokštis, V. Liuolia, S. Miasojedovas, S. Juršėnas, A. Zukauskas, M. Leszczynski, P. Perlin, T. Suski","doi":"10.1117/12.726357","DOIUrl":"https://doi.org/10.1117/12.726357","url":null,"abstract":"On the basis of investigation of photoluminescence (PL) dynamics of highly excited structures with different In content under strong excitation by short laser pulses and comparison with model calculations we analyze emission mechanisms in these In-containing systems. The obtained PL spectra in various In-containing samples exhibit stimulated emission line on the short-wavelength side of the spontaneous PL band. We suggest theoretical model for optical transitions in InGaN compounds with strong compositional fluctuations leading to two distinct types of the regions, one of which is In-rich islands. We assume that optical band-gap within those two regions is randomly fluctuating with Gaussian distribution. Calculated PL spectra as a function of excitation and time are in fair agreement with experimental results demonstrating all the observed peculiarities of luminescence dynamics obtained experimentally.","PeriodicalId":273853,"journal":{"name":"International Conference on Advanced Optical Materials and Devices","volume":"114 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2006-02-19","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"132291457","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: 0
Transverse patterns of mini-cavity optical parametric oscillator with seed injection 粒子注入微腔光学参量振荡器的横向图样
International Conference on Advanced Optical Materials and Devices Pub Date : 2006-02-19 DOI: 10.1117/12.726359
M. Peckus, K. Staliūnas, V. Smilgevičius, G. Šlekys, Valdemaras Rukavicius, V. Sirutkaitis
{"title":"Transverse patterns of mini-cavity optical parametric oscillator with seed injection","authors":"M. Peckus, K. Staliūnas, V. Smilgevičius, G. Šlekys, Valdemaras Rukavicius, V. Sirutkaitis","doi":"10.1117/12.726359","DOIUrl":"https://doi.org/10.1117/12.726359","url":null,"abstract":"We show experimentally, and interpret theoretically the conical and multiconical emission of optical parametric oscillators with seed injection in monolithic mini-cavities. We show the tunability of the conical emission angle, the switching between different resonant cones, and simultaneous emission on different cones, depending on the pump angle as well as on the length of the resonator.","PeriodicalId":273853,"journal":{"name":"International Conference on Advanced Optical Materials and Devices","volume":"94 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2006-02-19","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"116454321","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: 0
Group-delay dispersion measurements of laser mirrors using white-light interferometry 用白光干涉测量激光反射镜的群延迟色散
International Conference on Advanced Optical Materials and Devices Pub Date : 2006-02-19 DOI: 10.1117/12.726490
D. Paipulas, R. Grigonis, Vaidotas Staliulionis, V. Sirutkaitis
{"title":"Group-delay dispersion measurements of laser mirrors using white-light interferometry","authors":"D. Paipulas, R. Grigonis, Vaidotas Staliulionis, V. Sirutkaitis","doi":"10.1117/12.726490","DOIUrl":"https://doi.org/10.1117/12.726490","url":null,"abstract":"In this presentation we analyze three different techniques devised to measure dispersion of chirped mirrors. These methods are direct GD measurement, one-dimensional spectral interferometry and Fourier analysis of white light cross correlation. Each method was tested with the same samples in order to find out their advantages and limitations. It was find out that from the investigated methods the Fourier analysis of white light cross correlation is the most suited technique for fast and accurate dispersion measurement.","PeriodicalId":273853,"journal":{"name":"International Conference on Advanced Optical Materials and Devices","volume":"22 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2006-02-19","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"128292302","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: 0
Geometrical structure of small Co nanoparticles 小Co纳米颗粒的几何结构
International Conference on Advanced Optical Materials and Devices Pub Date : 2006-02-19 DOI: 10.1117/12.726518
J. Tamulienė, R. Vaišnoras, M. Balevičius, Loreta Rastinienė
{"title":"Geometrical structure of small Co nanoparticles","authors":"J. Tamulienė, R. Vaišnoras, M. Balevičius, Loreta Rastinienė","doi":"10.1117/12.726518","DOIUrl":"https://doi.org/10.1117/12.726518","url":null,"abstract":"Electronic and geometrical structures of Con (n=4, 6, 8) particles have been studied using both the density functional theory and the Hartree-Fock calculations. Structural differences to the corresponding clusters are presented. Four-fold coordination of the Co atoms was found to be a particularly preferable coordination environment in small Con species. The key element of the Co particle is suggested.","PeriodicalId":273853,"journal":{"name":"International Conference on Advanced Optical Materials and Devices","volume":"33 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2006-02-19","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"126351983","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: 5
Influence of molecular chain orientation on optical and carrier transport properties of polymer blends 分子链取向对聚合物共混物光学和载流子输运性能的影响
International Conference on Advanced Optical Materials and Devices Pub Date : 2006-02-19 DOI: 10.1117/12.726355
V. Kažukauskas, V. Čyras, M. Pranaitis, A. Apostoluk, L. Rocha, L. Sicot, P. Raimond, C. Sentein
{"title":"Influence of molecular chain orientation on optical and carrier transport properties of polymer blends","authors":"V. Kažukauskas, V. Čyras, M. Pranaitis, A. Apostoluk, L. Rocha, L. Sicot, P. Raimond, C. Sentein","doi":"10.1117/12.726355","DOIUrl":"https://doi.org/10.1117/12.726355","url":null,"abstract":"We have investigated properties of poly(9-vinylcarbazole) (PVK) doped with 30% wt 4-dibutylamino-4'-nitrostilbene (DBANS), depending on orientation of the polar DBANS molecules. Appearance of the orientation-induced built-in electric field was proven optically by the solid electric field induced second harmonic generation and electrically by the current-voltage characterization. Modification of optical properties was evidenced by the spectral dependencies of the absorption coefficient. The thermally stimulated current spectra had demonstrated that carrier transport and trapping are affected, too.","PeriodicalId":273853,"journal":{"name":"International Conference on Advanced Optical Materials and Devices","volume":"1 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2006-02-19","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"132512326","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
Surface plasmon resonance method: new applications to sorption kinetics analysis 表面等离子体共振法:在吸附动力学分析中的新应用
International Conference on Advanced Optical Materials and Devices Pub Date : 2006-02-19 DOI: 10.1117/12.726478
V. Vaicikauskas, Z. Balevičius, I. Ignatjev, G. Valinčius
{"title":"Surface plasmon resonance method: new applications to sorption kinetics analysis","authors":"V. Vaicikauskas, Z. Balevičius, I. Ignatjev, G. Valinčius","doi":"10.1117/12.726478","DOIUrl":"https://doi.org/10.1117/12.726478","url":null,"abstract":"In our previous work was showed that the SPR technique is very effective for in situ observation of the lipase interaction with MNFcP (9 merkaptononyl - 5' - ferrocenylpentanoate). However, the investigation was performed with only monochromatic 633nm light at the beginning and at the end of the reaction. In this work, the results of the investigation of the reaction kinetics using a tunable light source (&lgr;=600÷1400nm) are presented. Spectral measurements were accomplished with a commercial spectral ellipsometer GES-5 (SOPRA, France). It was demonstrated that this method is sufficiently sensitive for lipase interactions with a thin MNFcP layer (d=3.65nm). It was concluded that the experimental plasmon minimum shift is due to lipase sorption on the MNFcP and, as a result, causes an increase in the effective layer thickness. These results are important in understanding the interaction of these molecules and in determing their size and distribution on the surface.","PeriodicalId":273853,"journal":{"name":"International Conference on Advanced Optical Materials and Devices","volume":"52 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2006-02-19","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"127514072","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: 0
Optimization of HfO2, Al2O3 and SiO2 deposition leading to advanced UV optical coatings with low extinction 优化HfO2、Al2O3和SiO2的沉积工艺，制备出先进的低消光紫外光学涂层
International Conference on Advanced Optical Materials and Devices Pub Date : 2006-02-19 DOI: 10.1117/12.726563
G. Abromavičius, R. Buzelis, R. Drazdys, D. Perednis, A. Skrebutėnas
{"title":"Optimization of HfO2, Al2O3 and SiO2 deposition leading to advanced UV optical coatings with low extinction","authors":"G. Abromavičius, R. Buzelis, R. Drazdys, D. Perednis, A. Skrebutėnas","doi":"10.1117/12.726563","DOIUrl":"https://doi.org/10.1117/12.726563","url":null,"abstract":"The performance of optical coatings for UV region (200-300 nm) is closely related to their optical losses. There are a few factors which significantly influence the extinction of deposited coating - deposition vacuum, contamination from filaments of e-beam guns, ion source and finally, the optical properties of selected deposition materials. In this work the contribution of these different factors was investigated and evaluated. HfO2, Al2O3 and SiO2 are the most widely used materials for producing UV optical coatings down to 200 nm. Influence of background oxygen pressure during HfO2 and Al2O3 deposition was evaluated which enabled to reduce extinction of the deposited UV optical coatings.","PeriodicalId":273853,"journal":{"name":"International Conference on Advanced Optical Materials and Devices","volume":"11 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2006-02-19","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"116888521","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: 3
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