International Conference on Coherent and Nonlinear Optics最新文献_第5页

Controlling the light transmission through periodic and random metamaterials by applying a magnetic field and by changing the nano-structures shapes 通过施加磁场和改变纳米结构的形状来控制周期性和随机超材料的光传输

International Conference on Coherent and Nonlinear Optics Pub Date : 2010-09-10 DOI: 10.1117/12.881905

Y. M. Strelniker, D. Bergman, Y. Fleger, M. Rosenbluh, A. Voznesenskaya, A. Vinogradov, A. Lagarkov, A. Merzlikin

{"title":"Controlling the light transmission through periodic and random metamaterials by applying a magnetic field and by changing the nano-structures shapes","authors":"Y. M. Strelniker, D. Bergman, Y. Fleger, M. Rosenbluh, A. Voznesenskaya, A. Vinogradov, A. Lagarkov, A. Merzlikin","doi":"10.1117/12.881905","DOIUrl":"https://doi.org/10.1117/12.881905","url":null,"abstract":"The light transmission through metallic films with different types of nano-structures was studied both theoretically and experimentally. It is shown, analytically, numerically and experimentally, that the positions of the surface plasmon resonances depend on the nano-structural details. Those can be changed from sample to sample or in given sample by applying an external dc electric or magnetic field. The dependence of transmission spectrum on the shape of holes (inclusions) and external fields can be used for manipulation of the light transmission, as well as the polarization of the transmitted light and other optical properties, by external field. Two complementary situations are considered: a metal film with dielectric holes and a dielectric film with metallic islands. In the case of metallic islands, we propose two ways of controlling plasmon resonance frequency: changing the aspect ratio of the elliptical (or rectangular) islands and changing their mutual distances. For this case a new analytical asymptotic approach for calculating the optical properties of such plasmonic systems is developed. The results of our analytical and numerical studies are in good qualitative agreement with experiment.","PeriodicalId":309922,"journal":{"name":"International Conference on Coherent and Nonlinear Optics","volume":"17 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2010-09-10","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"124085686","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

Bit-to-bit parallel multiplication based on the third-order nonlinear optical response in a dye-doped polymer film at room temperature 室温下染料掺杂聚合物薄膜中基于三阶非线性光学响应的位对位并行倍增

International Conference on Coherent and Nonlinear Optics Pub Date : 2010-09-10 DOI: 10.1117/12.881029

G. Safiullin, V. Nikiforov, V. S. Lobkov, V. Samartsev, A. Leontiev

引用次数: 0

Q-switching with single crystal photo-elastic modulators 单晶光弹性调制器调q

International Conference on Coherent and Nonlinear Optics Pub Date : 2010-09-10 DOI: 10.1117/12.880816

F. Bammer, R. Petkovšek

{"title":"Q-switching with single crystal photo-elastic modulators","authors":"F. Bammer, R. Petkovšek","doi":"10.1117/12.880816","DOIUrl":"https://doi.org/10.1117/12.880816","url":null,"abstract":"An overview is given about experiments with a new method for Q-switching lasers at a constant pulse repetition frequency. It uses inside the laser resonator a Single Crystal Photo-Elastic Modulator (SCPEM). This consists of one piezo-electric crystal electrically excited on a mechanical resonance frequency. In resonance mechanical stresses are induced that lead via the photo-elastic effect to a strongly modulated birefringence. Polarized light going through such an oscillating crystal will experience a significant modulation of its polarization and of transmission through a polarizer. Suitable materials should not be optically active, as it is for example the case for SiO2, and should allow the excitation of a longitudinal oscillation with an electric field perpendicular to the travelling direction of the light. Crystals of the group 3m, like LiTaO3 and LiNbO3, proved to be ideally suited for SCPEMS for the NIR- and VIS-region. For the infrared GaAs can be used. We demonstrated SCPEM-Q-switching for a Nd:YAG-fiber, a Nd:YVO4-slab- and a Nd:YAG-rod-laser with typical pulse repetition rates of 100-200kHz, pulse enhancement factors of ~100 and pulse durations ~1/100 of the period time. Typically the average power during pulsed operation is nearly the same as the cw-power, when the modulator is switched off. The most stable results were achieved up to now with the Nd:YVO4-slab-laser at 10W average power, 1.1 kW peak power, 127 kHz pulse repetition rate, and 70ns pulse durations.","PeriodicalId":309922,"journal":{"name":"International Conference on Coherent and Nonlinear Optics","volume":"49 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2010-09-10","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"115212831","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

Beat note characterization from diode pumped passively mode-locked bidirectional ring Nd:YVO4 laser 二极管泵浦被动锁模双向环形Nd:YVO4激光器的拍音表征

International Conference on Coherent and Nonlinear Optics Pub Date : 2010-09-10 DOI: 10.1117/12.881780

V. Kubecek, O. Grepl, M. Čech, J. Diels, L. Arissian

引用次数: 0

Formation of microtower structures on liquid metal surfaces under nanosecond laser ablation 纳秒激光烧蚀下液态金属表面微塔结构的形成

International Conference on Coherent and Nonlinear Optics Pub Date : 2010-09-10 DOI: 10.1117/12.878442

A. N. Panchenko, N. Bulgakova, M. Shulepov, A. E. Tel’minov

引用次数: 0

Surface chemical reactions induced by molecules electronically excited in the gas phase 由在气相中被电子激发的分子引起的表面化学反应

International Conference on Coherent and Nonlinear Optics Pub Date : 2010-09-10 DOI: 10.1117/12.882580

K. Pankin, J. Nielsen, A. Andersen, J. Jeppesen, L. Jozefowski, V. Petrunin

{"title":"Surface chemical reactions induced by molecules electronically excited in the gas phase","authors":"K. Pankin, J. Nielsen, A. Andersen, J. Jeppesen, L. Jozefowski, V. Petrunin","doi":"10.1117/12.882580","DOIUrl":"https://doi.org/10.1117/12.882580","url":null,"abstract":"We present a model suggesting high chemical activity of electronically-excited molecules colliding with an isolator surface. Initial photochemical event is accounted for as the result of molecular evolution on the electronically-excited potential energy surface (PES), where acceleration and alignment are taking place, guiding all the molecules towards the intersections with the ground state PES, where transitions to the ground state PES will occur with minimum energy dissipation. The accumulated kinetic energy may be used to overcome the chemical reaction barrier. While recombination chemical reactions in a gas phase require participation of a third body, this strong limitation on the reaction rates is removed upon interaction with a surface. To observe the predicted phenomenon, we suggested a new experimental approach, Evanescent Wave Photocatalysis1, based on application of total internal reflection on an insulator surface. Laser photoexcitation is localized in a narrow boundary gas layer just above the interface; majority of the excited molecules can reach the surface before the relaxation. The experiments are performed at high gas pressures, so that dense fluxes of the excited reagents can be readily produced. Products of chemical adsorption and/or chemical reactions induced within adsorbates are aggregated on the surface and observed by light scattering. We will demonstrate how pressure and spectral dependencies of the chemical outcomes, polarization of the light and interference of two laser beams inducing the reaction can be used to distinguish the new process we try to investigate from chemical reactions induced by photoexcitation within adsorbed molecules and/or gas phase photolysis.","PeriodicalId":309922,"journal":{"name":"International Conference on Coherent and Nonlinear Optics","volume":"6 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2010-09-10","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"130536962","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

Microwave excited periodic-pulse planar CO2 laser 微波激发周期脉冲平面CO2激光器

International Conference on Coherent and Nonlinear Optics Pub Date : 2010-09-10 DOI: 10.1117/12.881840

A. Mineev, S. Nefedov, P. Pashinin, P. Goncharov, V. Kiselev

引用次数: 0

Quantum efficiency increasing and lasing in the quantum wells based on ZnO 基于ZnO的量子阱中量子效率的提高和激光

International Conference on Coherent and Nonlinear Optics Pub Date : 2010-09-10 DOI: 10.1117/12.881484

A. Lotin, O. Novodvorsky, L. Parshina, E. Khaydukov, D. Zuev, O. Khramova, V. Panchenko

引用次数: 2

Photosynthetic light-harvesting complexes: fluorescent and absorption spectroscopy under two-photon (1200-1500 nm) and one-photon (600-750 nm) excitation by laser femtosecond pulses 光合收光复合物:激光飞秒脉冲双光子(1200-1500 nm)和单光子(600-750 nm)激发下的荧光和吸收光谱

International Conference on Coherent and Nonlinear Optics Pub Date : 2010-09-10 DOI: 10.1117/12.882498

I. Stepanenko, V. O. Kompanets, S. Chekalin, Zoya K. Makhneva, A. Moskalenko, A. Razjivin

{"title":"Photosynthetic light-harvesting complexes: fluorescent and absorption spectroscopy under two-photon (1200-1500 nm) and one-photon (600-750 nm) excitation by laser femtosecond pulses","authors":"I. Stepanenko, V. O. Kompanets, S. Chekalin, Zoya K. Makhneva, A. Moskalenko, A. Razjivin","doi":"10.1117/12.882498","DOIUrl":"https://doi.org/10.1117/12.882498","url":null,"abstract":"The pathways of excitation energy transfer (EET) via pigments of the light-harvesting antenna are still in discussion. The bacteriochlorophyll fluorescence of peripheral light-harvesting complexes (LH2) from purple bacteria can be observed upon two-photon excitation (TPE) within 1200-1500 nm spectral range (a broad band near 1300 nm). Earlier the occurrence of this band was taken as an evidence for the participation of \"dark\" carotenoid S1 state in EET processes (see [Walla et al., Proc. Nat. Acad. Sci. U.S.A. 97, 10808-10813 (2000)] and references in it). However we showed that TPE spectrum of LH2 fluorescence within 1200-1500 nm is not associated with carotenoids [Stepanenko et al., J. Phys. Chem. B. 113(34), 11720-11723 (2009)]. Here we present TPE spectra of fluorescence for chromatophores and lightharvesting complexes LH2 and LH1 from wild-type cells and from carotenoid-depleted or carotenoidless mutant cells of several purple bacteria. The broad band within 1300-1400 nm was found for all preparations. Absorption pump-probe femtosecond spectroscopy applied to LH2 complex from Rb. sphaeroides revealed the similar spectral and kinetic patterns for TPE at 1350 nm and one-photon excitation at 675 nm. Analysis of pigment composition of this complex by high-pressure liquid chromatography showed that even under mild isolation conditions some bacteriochlorophyll molecules were oxidized to 3-acetyl-chlorophyll molecules having the long-wavelength absorption peak in the 650-700 nm range. It is proposed that these 3-acetyl-chlorophyll molecules are responsible for the broad band in TPE spectra within the 1200-1500 nm region.","PeriodicalId":309922,"journal":{"name":"International Conference on Coherent and Nonlinear Optics","volume":"25 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2010-09-10","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"131015409","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

Numerical modeling of sintering of two-component metal powders with laser beams 激光烧结双组分金属粉末的数值模拟

International Conference on Coherent and Nonlinear Optics Pub Date : 2010-09-10 DOI: 10.1117/12.881336

V. Niziev, A. V. Koldoba, F. Mirzade, V. Panchenko, Y. Poveschenko, M. Popov

引用次数: 0