ZnO/ZnS核-壳量子点的双光子吸收效应

ZnO/ZnS核-壳量子点的双光子吸收效应 Two-photon Absorption in ZnO/ZnS Core-shell Quantum Dots 刘姝妤 LIU Shu-yu 2 first-author 钟绵增 ZHONG Mian-zeng 1 孟秀清 MENG Xiu-qing 1 李京波 LI Jing-bo 1 3 王沅倩 WANG Yuan-qian 2 肖思 XIAO Si 2 何军 HE Jun 2 浙江师范大学 LED芯片研发中心,浙江 金华,321004 浙江师范大学 LED芯片研发中心,浙江 金华,321004 Research Center for Light Emitting Diodes(LED), Zhejiang Normal University Research Center for Light Emitting Diodes(LED), Zhejiang Normal University 中南大学物理与电子学院 超微结构与超快过程湖南省重点实验室,湖南 长沙,410083 中南大学物理与电子学院 超微结构与超快过程湖南省重点实验室,湖南 长沙,410083 Hunan Key Laboratory for Super-microstructure and Ultrafast Process, School of Physics and Electronics, Central South University Hunan Key Laboratory for Super-microstructure and Ultrafast Process, School of Physics and Electronics, Central South University 中国科学院半导体研究所 超晶格与微结构国家重点实验室 北京,100083 中国科学院半导体研究所 超晶格与微结构国家重点实验室 北京,100083 State Key Laboratory of Superlattices and Microstructures, Institute of Semiconductors, Chinese Academy of Sciences State Key Laboratory of Superlattices and Microstructures, Institute of Semiconductors, Chinese Academy of Sciences 利用飞秒激光Z-扫描与泵浦-探测技术,研究了室温下ZnO/ZnS与ZnO/ZnS/Ag核-壳胶体量子点的双光子吸收效应.研究发现:ZnO基核-壳量子点的本征双光子吸收系数比ZnO体材料增大了3个数量级;测量得到的660 nm处的ZnO/ZnS核-壳量子点双光子吸收截面约为4.310 -44 cm 4 sphoton -1 ,比相应的ZnS、ZnSe及 CdS量子点大2个数量级;当ZnO/ZnS核-壳量子点镶嵌了银纳米点时,非线性吸收有所增强.ZnO基复合纳米结构的双光子吸收增强可归因于量子限域与局域场效应. We report a large two-photon absorption (TPA) in ZnO/ZnS and ZnO/ZnS/Ag core/shell quantum dots (QDs). Z-scan and pump-probe techniques with femtosecond laser pulses were employed to characterized the quantum dots. The intrinsic TPA coefficients of ZnO-based core/shell QDs are enhanced with nearly three orders of magnitude compared to that of ZnO bulk counterpart, which is attributable to quantum confinement effect. The TPA cross-section of ZnO-based nanocomposites is determined to be ~4.310 -44 cm 4 sphoton -1 at the wavelength of 660 nm. This value is at least two orders of magnitude greater than that of ZnS, ZnSe, and CdS QDs. Due to the local field effect, the nonlinear absorption in ZnO/ZnS core/shell QDs is improved as beaded with Ag nano-dots. 双光子吸收 ZnO/ZnS核-壳量子点 Z-扫描技术 two-photon absorption ZnO/ZnS core/shell quantum dots Z-scan technique Alivisatos A P. Semiconductor clusters, nanocrystals, and quantum dots [J]. Science, 1996, 271(5251):933-937. He G S, Tan L S, Zheng Q D, et al. Multi-photon absorbing materials: Molecular designs, syntheses, characterizations, and applications [J]. Chem. Rev., 2008, 108(4):1245-1330. Ray P C. Size and shape dependent second order nonlinear optical properties of nanomaterials and their application in biological and chemical sensing [J]. Chem. Rev., 2010, 110:5332-5365. Gholami-Kaliji S, Saievar-Iranizad E, Dehghani Z, et al. Photoluminescent and nonlinear optical properties of aqueous synthesised Cd0.6Zn0.4Te nanocrystals in different temperatures [J]. Micro Nano Lett., 2012, 7(5):460-463. Smith A M, Nie S. Semiconductor nanocrystals: Structure, properties, and band gap engineering [J]. Acc. Chem. Res., 2010, 43:190-200. Rinnert H, Jambois O, Vergnat M. Photoluminescence properties of size-controlled silicon nanocrystals at low temperatures [J]. J. Appl. Phys., 2009, 106(2):023501-1-10. He J, Ji W, Ma G H, et al. Excitonic nonlinear absorption in CdS nanocrystals studied using Z-scan technique [J]. Chin. J. Appl. Phys., 2004, 95(11):6381-6386. Zhu Y W, Elim H I, Foo Y L. Multiwalled carbon nanotubes beaded with ZnO nanoparticles for ultrafast nonlinear optical switching [J]. Adv. Mater., 2006, 18:587-592. Xing G C, Ji W, Zheng Y, et al. Doped ZnSe/ZnS quantum dots [J]. Opt. Express, 2008, 16(8):5710-5715. Ahn C H, Mohanta S K, Lee N E, et al. Enhanced exciton-phonon interactions in photoluminescence of ZnO nanopencils [J]. Appl. Phys. Lett., 2009, 94(26):261904-1-3. Chon J W M, Gu M, Bullen C, et al. Three-photon excited band edge and trap emission of CdS semiconductor nanocrystals [J]. Appl. Phys. Lett., 2004, 84:4472-4474. Nikesh V V, Dharmadhikari A, Ono H, et al. Optical nonlinearity of monodispersed, capped ZnS quantum particles [J]. Appl. Phys. Lett., 2004, 84:4602-4604. Lad A D, Kiran P P, More D, et al. Two-photon absorption in ZnSe and ZnSe/ZnS core/shell quantum structures [J]. Appl. Phys. Lett., 2008, 92(4):043126-1-3. Karthikeyan B, Suchand Sandeep C, Pandiyarajan S T, et al. Optical and nonlinear absorption properties of Na doped ZnO nanoparticle dispersions [J]. Appl. Phys. Lett., 2009, 95(2):023118-1-3. He J, Ji W, Mi J, et al. Three-photon absorption in water-soluble ZnS nanocrystals [J]. Appl. Phys. Lett., 2006, 88(18):181114-1-3. He J, Scholes G D, Ang Y L, et al. Direct observation of three-photon resonance in water-soluble ZnS quantum dots [J]. Appl. Phys. Lett., 2008, 92(13):131114-1-3. Liao Y, Yu X F, Qiu Y, et al. Nonlinear photoluminescence of ZnO/ZnS nanotetrapods [J]. Chem. Phys. Lett., 2008, 465(4-6):272-274. Shuai X M, Shen W Z. A facile chemical conversion synthesis of ZnO/ZnS core/shell nanorodes and deverse metal sulfide nanotubes [J]. J. Phys. Chem. C, 2011, 115:6415-6422. Chaudhuri R G, Paria S. Gold-based core/shell and hollow nanoparticles [J]. Chem. Rev., 2011, 112:2373-2379. Madler L, Stark W J, Pratsinis S E. Rapid synthesis of stable ZnO quantum dots [J]. J. Appl. Phys., 2002, 92:6537-6540. He J, Qu Y L, Li H P, et al. Three-photon absorption in ZnO and ZnS crystals [J]. Opt. Express, 2005, 13(23):9235-9247. Sutherland R L. Handbook of Nonlinear Optics [M]. 2nd ed. New York: Marcel Dekker, 2003. Ma G H, Sun W X, Tang S H, et al. Size and dielectric dependence of the third-order nonlinear optical response of Au nanocrystals embedded in matrices [J]. Opt. Lett., 2002, 27(12):1043-1045. Gu B, Lou K, Wang H T, et al. Dynamics of two-photon-induced three-photon absorption in nanosecond, picosecond, and femtosecond regimes [J]. Opt. Lett., 2010, 35:417-419. Gu B, Wang J, Chen J, et al. Z-scan theory for material with two- and three-photon absorption [J]. Opt. Express, 2005, 13(23):9230-9234. 10.3788/fgxb20153602.0249 O433.1 国家自然科学基金(61222406,11174371,11104250);湖南省自然科学基金(12JJ1001);教育部博士学科点专项科研基金(20110162120072);教育部新世纪优秀人才支持计划(NCET-11-0512)资助项目 2014-05-23 2014-07-14 2014-12-12 2015-02-03 2020-08-11 2 36