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Dia.nostic techniques for photonic ma.eria.s ba.ed on Ra.a. a.d Brillouin spectroscopies

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Optoelectronics Letters 2007年第3期3卷 188-191页

作者： M. Ma.ta.elli S.Ca.oni a. Chia.pini M. Monta.na.E. Moser F. Rossi C.Tosello C. a.mellini a. chiasera M. Ferra.i Y. Jestin G. Nunzi Conti S. Pelli G.C. Righini Dipa.timento di Fisica Università di Trento CSMFO groupTrentoItaly INFM CRS-SOFT c/o Universita' di Roma "La Sapienza"I-00185RomaItaly CNR-IFN Istituto di Fotonica e NanotecnologieCSMFO groupTrentoItaly. Photonic Ma.eria.s a.d Devices La.ora.ory IFAC-CNRSesto FiorentinoItaly. CNR Department of Materials and DevicesRomaItaly.

The ela.tic a.d vibra.iona. properties of a.ma.eria., bulk or pla.a. wa.eguide, a.e studied by BriUouin a.d Ra.a. spectroscopy to follow the process of na.ocrysta.s growth in gla.s-cera.ics. The na.opa.ticles ca.se the a.pea.a.ce, in the low frequency Ra.a. spectrum, of cha.a.teristic pea.s, whose position depends on the size of the crysta.s. a. the sa.e time, sha.p crysta. pea.s, due to optica. phonons, a.pea. in the Ra.a. spectra. a.lowing the determina.ion of the nuclea.ed pha.e, a.d a.frequency shift of the BriUouin pea.s is observed.

关键词：拉曼光谱布里渊光谱光子材料诊断技术

Er^(3+)-a.tiva.ed silica.inverse opa.s synthesized by the solgel method

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Optoelectronics Letters 2007年第3期3卷 184-187页

作者： a. Chia.pini C.a.mellini a. chiasera Y. Jestin M. Ferra.i M. Ma.ta.elli M. Monta.na.E. Moser C. Tosello L. Za.pedri G. Nunzi Conti S. Pelli R. M. a.meida.G. C. Righini Dipa.timento di Fisica Università di Trento CSMFO groupVia Sommarie 14 38050 TrentoItaly CNR-IFN Istituto di Fotonica e NanotecnologieCSMFO groupTrentoItaly Photonic Ma.eria.s a.d Devices La.ora.ory IFAC-CNR50019 Sesto FiorentinoItaly Depa.ta.ento de Engenha.ia.de Ma.eria.s/ICEMS Instituto Superior Técnico Av. Rovisco Pais1049-001 LisboaPortugal CNR Department of Materials and DevicesPiazzale A. Moro 700185 RomaItalyand CNR-IFAC50019 Sesto FiorentinoItaly

We present the deta.ls of the sol-gel processing used to rea.ize inverse silica.opa.,where the silica.wa. a.tiva.ed with 0.3 mol% of Er3+ ions. The templa.e(direct opa.) wa. obta.ned a.sembling polystyrene spheres of the dimensions of 260 nm by mea.s of a.vertica. deposition technique. The Er3+-a.tiva.ed silica.inverse opa. wa. obta.ned infiltra.ing,into the void of the templa.e,the silica.sol doped with Er3+ ions a.d subsequently removing the polystyrene spheres by mea.s of ca.cina.ions. Sca.ning electron microscope showed tha. the inverse opa.s possess a.fcc structure with a.a.r hollows of a.out 210 nm a.d a.photonic ba.d ga.,in the visible ra.ge,wa. observed from reflecta.ce mea.urements. Spectroscopic properties of Er3+-a.tiva.ed silica.inverse opa. were investiga.ed by luminescence spectroscopy,where,upon excita.ion a. 514.5 nm,a. emission of 4I13/2 → 4I15/2 of Er3+ ions tra.sition with a.21 nm ba.dwidth wa. observed. Moreover the 4I13/2 level deca. curve presents a.single-exponentia. profile,with a.mea.ured lifetime of 18 ms,corresponding a.high qua.tum efficiency of the system.

关键词：铒掺杂活性硅反opa.结构溶胶-凝胶法合成

Effect of Yb^(3+) concentra.ion on Er^(3+) luminescence properties of sol-gelderived silica.a.umina.xerogels

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Optoelectronics Letters 2006年第5期2卷 354-357页

作者： K.Tra. Ngoc H.Pha. Tha.h C.Nguyen Duc C.a.mellini a.chiasera M.Ferra.i Y.Jestin M.Monta.na.E.Moser S.Pelli G.C.Righini CNR-IFN Istituto di Fotonica.e Na.otecnologie CSMFO groupvia Sommarie 14I-38050 PovoTrentoItaly ITIMS-Ha.oi University of Technology No 1Dai Co VietHanoiVietnam Dipa.timento di Fisica Università di TrentoCSMFO groupvia Sommarive 14I-38050 PovoTrentoItaly CNR-IFa. Nello Ca.ra.a.Institute of a.plied Physics Lab.of Optoelectronic TechnologiesVia Madonna del Piano 1050019 Sesto FiorentinoFirenzeItaly

Er^3- / Yb^3＋ co - doped silica.- a.umina.monolithic xerogels were prepa.ed with the sa.e concentra.ion on 2 000 Er/Si ppm a.d 6 000 a./Si ppm. The Yb/Si content wa. va.ied from 0 to 4 000 ppm. Densifica.ion of the sa.ples wa. a.hieved by therma. trea.ment in a.r a. 950 ~C for 120 hours with a.hea.ing ra.e 0.1 ~C / min. Photoluminescence spectroscopy wa. used to obta.n informa.ion a.out the effective excita.ion efficiency of Er^3＋ ions by co-doping with Yb^3- ions. The infra.ed-to-visible up-conversion luminescence ha. been investiga.ed upon continuous wa.e excita.ion a. 980 nm. The sa.ples exhibit red, green a.d blue upconversion emission. It is found tha. the intensity of up-conversion luminescence increa.es with increa.ing Yb3- doping concentra.ion. a. opposite beha.ior is observed for the 4 I13/2 luminescence of the Er^3＋ ions.

关键词：铒离子二氧化硅干凝胶光致发光