Europe Optics + Optoelectronics最新文献_第2页

Degenerate four-wave mixing and two-photon induced gratings in colloidal quantum dots CdSe/ZnS 胶体量子点CdSe/ZnS中的简并四波混频和双光子诱导光栅

Europe Optics + Optoelectronics Pub Date : 2015-05-18 DOI: 10.1117/12.2178667

A. Smirnov, M. Kozlova, V. Dneprovskii

{"title":"Degenerate four-wave mixing and two-photon induced gratings in colloidal quantum dots CdSe/ZnS","authors":"A. Smirnov, M. Kozlova, V. Dneprovskii","doi":"10.1117/12.2178667","DOIUrl":"https://doi.org/10.1117/12.2178667","url":null,"abstract":"The features of nonlinear and electro-optical processes has been discovered in the case of two-photon resonant excitation of the excitons in colloidal CdSe/ZnS quantum dots. Self-diffraction arises for two laser beams intersecting in the cell with colloidal CdSe/ZnS quantum dots (QDs) due to the dynamic phase grating formatting. The calculated induced change in the refractive is sufficient to form a phase diffraction grating. Such a large value of χ(3) as compared to the third-order nonlinear susceptibility for the solvent (hexane) is due to the increase in χ(3) occurring when the intermediate resonance is attained in a medium transparent for laser radiation. In order to identify physical processes responsible for the induced grating formation and the diffraction efficiency self-diffracted pulse intensity dependences on the incident pulse intensity were measured for two samples of colloidal QD CdSe/ZnS, which frequency of the fundamental exciton transition is tuned to the high-frequency and low-frequency region from the double laser frequency. The discovered cubic dependence of the self-diffracted pulse intensity on the incident pulse intensity was explained by four-wave mixing process. Discovered above 5-th index of power dependence of the self-diffracted pulse intensity on the excitation pulses intensity we explained by the increasing magnitude of two-photon absorption (due to shifting of two photons energy of laser radiation to the exact exciton absorption resonance by red Stark shift of the exciton absorption), accompanied by the growth absorption by two-photon excited carriers that leads to the induced amplitude grating formation in addition to the phase grating.","PeriodicalId":347374,"journal":{"name":"Europe Optics + Optoelectronics","volume":"69 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2015-05-18","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"115863159","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

Highly nonlinear sub-micron silicon nitride trench waveguide coated with gold nanoparticles 高非线性亚微米氮化硅沟槽波导包覆金纳米颗粒

Europe Optics + Optoelectronics Pub Date : 2015-05-18 DOI: 10.1117/12.2182290

Yuewang Huang, Qiancheng Zhao, N. Sharac, R. Ragan, O. Boyraz

{"title":"Highly nonlinear sub-micron silicon nitride trench waveguide coated with gold nanoparticles","authors":"Yuewang Huang, Qiancheng Zhao, N. Sharac, R. Ragan, O. Boyraz","doi":"10.1117/12.2182290","DOIUrl":"https://doi.org/10.1117/12.2182290","url":null,"abstract":"We demonstrate the fabrication of a highly nonlinear sub-micron silicon nitride trench waveguide coated with gold nanoparticles for plasmonic enhancement. The average enhancement effect is evaluated by measuring the spectral broadening effect caused by self-phase-modulation. The nonlinear refractive index n2 was measured to be 7.0917×10-19 m2/W for a waveguide whose Wopen is 5 μm. Several waveguides at different locations on one wafer were measured in order to take the randomness of the nanoparticle distribution into consideration. The largest enhancement is measured to be as high as 10 times. Fabrication of this waveguide started with a MEMS grade photomask. By using conventional optical lithography, the wide linewidth was transferred to a <100> wafer. Then the wafer was etched anisotropically by potassium hydroxide (KOH) to engrave trapezoidal trenches with an angle of 54.7º. Side wall roughness was mitigated by KOH etching and thermal oxidation that was used to generate a buffer layer for silicon nitride waveguide. The guiding material silicon nitride was then deposited by low pressure chemical vapor deposition. The waveguide was then patterned with a chemical template, with 20 nm gold particles being chemically attached to the functionalized poly(methyl methacrylate) domains. Since the particles attached only to the PMMA domains, they were confined to localized regions, therefore forcing the nanoparticles into clusters of various numbers and geometries. Experiments reveal that the waveguide has negligible nonlinear absorption loss, and its nonlinear refractive index can be greatly enhanced by gold nano clusters. The silicon nitride trench waveguide has large nonlinear refractive index, rendering itself promising for nonlinear applications.","PeriodicalId":347374,"journal":{"name":"Europe Optics + Optoelectronics","volume":"2 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2015-05-18","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"114976865","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

Propagation of femtosecond pulse with self-similar shape in medium with nonlinear absorption 具有自相似形状飞秒脉冲在非线性吸收介质中的传播

Europe Optics + Optoelectronics Pub Date : 2015-05-18 DOI: 10.1117/12.2178953

V. Trofimov, I. Zakharova

引用次数: 5

Laser thermal recording on non-homogeneous medium 非均匀介质上的激光热记录

Europe Optics + Optoelectronics Pub Date : 2015-05-18 DOI: 10.1117/12.2178482

A. Lapchuk, I. Gorbov, A. Kryuchyn, Yu. O. Borodin

引用次数: 0

Three wave mixing enhancement in metal-dielectric-metal nanostructures 金属-介电-金属纳米结构中的三波混频增强

Europe Optics + Optoelectronics Pub Date : 2015-05-18 DOI: 10.1117/12.2178875

S. Héron, P. Bouchon, F. Pardo, A. Baucour, R. Haïdar

引用次数: 0

Modeling of self-diffraction from the induced aperture in colloidal quantum dots 胶体量子点诱导孔径自衍射的建模

Europe Optics + Optoelectronics Pub Date : 2015-05-18 DOI: 10.1117/12.2178661

K. Ezhova, A. Smirnov

引用次数: 8

Investigations on growth, structure, optical properties and laser damage threshold of organic nonlinear optical crystals of Guanidinium L-Ascorbate 抗坏血酸胍有机非线性光学晶体的生长、结构、光学性质和激光损伤阈值研究

Europe Optics + Optoelectronics Pub Date : 2015-05-18 DOI: 10.1117/12.2177655

R. Saripalli, Sanath Kumar, H. Bhat, S. Elizabeth

引用次数: 5

Continuous-wave seeded mid-IR parametric system pumped by the high-average-power picosecond Yb:YAG thin-disk laser 高平均功率皮秒Yb:YAG薄板激光器抽运的连续波种子中红外参量系统

Europe Optics + Optoelectronics Pub Date : 2015-05-18 DOI: 10.1117/12.2178747

O. Novák, M. Smrž, T. Miura, H. Turčičova, A. Endo, T. Mocek

{"title":"Continuous-wave seeded mid-IR parametric system pumped by the high-average-power picosecond Yb:YAG thin-disk laser","authors":"O. Novák, M. Smrž, T. Miura, H. Turčičova, A. Endo, T. Mocek","doi":"10.1117/12.2178747","DOIUrl":"https://doi.org/10.1117/12.2178747","url":null,"abstract":"Mid-IR wavelength range offers variety of interesting applications. Down-conversion in the optical parametric devices is promising to generate high average power mid-IR beam due to inherently low thermal load of the nonlinear crystals if a powerful and high quality pump beam is available. We developed 100 kHz pump laser of 100-W level average power. The stretched pulses of Yb-fiber laser oscillator at 1030 nm wavelength are injected into the regenerative amplifier with an Yb:YAG thin-disk. Diode pumping at zero phonon line at wavelength of 969 nm significantly reduces its thermal load and increases conversion efficiency and stability. We obtained the beam with power of 80 W and 2 ps compressed pulsewidth. We are developing a watt level mid-IR picosecond light source pumped by a beam of the thin disk regenerative amplifier. Part of the beam pumps PPLN, which is seeded by a continuous wave laser diode at 1.94 μm to decrease the generation threshold and determine the amplified spectrum. The 3 W pumping gave output of 30 mW, which is by up to two orders higher compared to unseeded operation. The gain of about 107 was achieved in the PPLN in the temporal window of the pump pulse. The spectrum and beam of the generated idler pulses in the mid-IR was measured. We obtained an amplified signal from the second stage with the KTP crystal. We expect watt level mid-IR output for initial 50-W pumping. The generation of longer wavelengths is discussed.","PeriodicalId":347374,"journal":{"name":"Europe Optics + Optoelectronics","volume":"104 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2015-05-18","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"133649001","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

Advances in high quality factor optical resonators for optoelectronics 光电子学高质量因数光学谐振器的研究进展

Europe Optics + Optoelectronics Pub Date : 2015-05-18 DOI: 10.1117/12.2178460

P. Salzenstein, K. Saleh

引用次数: 1

Novel mechanisms of optical harmonic generation on excitons in semiconductors 半导体中激子光谐波产生的新机制

Europe Optics + Optoelectronics Pub Date : 2015-05-18 DOI: 10.1117/12.2185309

D. Yakovlev, W. Warkentin, D. Brunne, J. Mund, V. Pavlov, A. Rodina, R. Pisarev, M. Bayer

引用次数: 1