Student Project Abstracts 2005 - Pluto - University of Washington

More documents

Recommendations

Info

12 CMDITR Review of Undergraduate Research Vol. 2 No. 1 Summer 2005
Barium Titanate Doped Sol-Gel for Electro-Optic DevicesDeniz CivayUniversity of WashingtonNasser Peyghambarian, Robert Norwood,and Chris DeRosePeyghambarian Lab, Optical Science CenterThe University of ArizonaThe goal of my research was to successfully dope BaTiO 3nanocrystals into a sol-gel matrix,creating an electro-optic (EO) composite. After poling I determined the EO propertiesof the composite material. The resulting material exhibits an EO coefficient of 4pm/Vhowever poling conditions are not yet optimized. The advantage of using sol-gel is that thecomposite material will be photopatternable.RESEARCH METHODSI began my research by reviewing relevant literature. Thenanocrystals that have had some success in this field are PbTiO 3and BaTiO 3. However PbTiO 3and BaTiO 3nanocrystals have notyet been doped into sol-gel. BaTiO 3has a high EO coefficient butits high dielectric constant limits high speed and wide bandwidthoperation. The low dielectric constant of sol-gel served to lowerthe overall dielectric constant of the composite improving thebandwidth of the material. I purchased some BaTiO 3nanocrystalsfrom Sigma-Aldrich and TPL, inc. in order to perform theexperiments. The kind of testing that I performed on the BaTiO 3nanocrystal composite films was to determine the EO coefficientand loss.INTRODUCTION TO THEORYI am investigating electro-optic nanocomposites because solgelis photopatternable. Doping sol-gel with an EO nanocrystalresults in a photopatternable EO material. Barium titanatenanocrystals are being used because of the high EO coefficient of150pm/V. Barium titanate nanocrystals are also easily accessibleand cheap.Some important material properties to consider are the scatteringloss, dielectric constant and electro-optic coefficient. Thescattering loss is a measure of how much energy is lost from abeam of light passing through a material due to inhomogeneities.See Figure 1 below for an illustration of this phenomenon.Another important material property is the dielectric constant.The dielectric constant limits operational bandwidth. Ideallythe dielectric constant for optical and electrical waves shouldbe matched. The third important material property to consideris the electro-optic coefficient. The electro-optic coefficient isa measure of how much the index of refraction changes with anapplied electric field.Before starting the experimental procedure I used the Maxwell-GarnetTheory to model the scatting loss and composite dielectricconstant. The key variables in the Maxwell-Garnet Theoryare the nanocrystal radius, the wavelength of the incominglight, the dielectric constant of the nanocrystal and sol-gel, therefractive index of the nanocrystal and sol-gel, and the volumefraction.CALCULATIONSThe following equations are based on the Maxwell-GarnetTheory.Equation 1:C sca= (8/3)*[(2*π*n c*r)/( λ)] 4 *{[( n c/ n m) 2 -1]/[( n c/ n m) 2 +2]} 2 *π*r 2Where:n m= index of refraction of the sol-gel = 1.5n p= index of refraction of the particle = 2.3r = average particle radius = 20nmλ = wavelength of light = 1550nmC sca= .389657701Figure 1. An illustration of scattering loss.Equation 2:α sca= (3*η*C sca)/(4*π*r 3 )CMDITR Review of Undergraduate Research Vol. 2 No. 1 Summer 2005 13
Page 2 and 3: The material is based upon work sup
Page 4 and 5: TABLE OF CONTENTSSynthesis of Dendr
Page 6 and 7: 6 CMDITR Review of Undergraduate Re
Page 8 and 9: SYNTHESIS OF DENDRIMER BUILDING BLO
Page 10 and 11: throughout the work period. Five su
Page 14 and 15: BARIUM TITANATE DOPED SOL-GEL FOR E
Page 16 and 17: BARIUM TITANATE DOPED SOL-GEL FOR E
Page 18 and 19: SYNTHESIS OF NORBORNENE MONOMER OF
Page 20: 20 CMDITR Review of Undergraduate R
Page 23 and 24: using different reaction conditions
Page 25 and 26: Synthesis of Nonlinear Optical-Acti
Page 27 and 28: quality of the XRD structures wasca
Page 29 and 30: Behavioral Properties of Colloidal
Page 32 and 33: Transmission electron microscopy ha
Page 34 and 35: 34 CMDITR Review of Undergraduate R
Page 36 and 37: areorient themselves with the elect
Page 38 and 39: Fabry-Perot modulators with electro
Page 42 and 43: QUANTIZED HAMILTON DYNAMICS APPLIED
Page 46 and 47: INVESTIGATING NEW CLADDING AND CORE
Page 48 and 49: Dr. Robert NorwoodChris DeRoseAmir
Page 50 and 51: SYNTHESIS OF TPD-BASED COMPOUNDS FO
Page 52 and 53: SYNTHESIS OF TPD-BASED COMPOUNDS FO
Page 54 and 55: OPTIMIZING HYBRID WAVEGUIDESpropaga
Page 56 and 57: At closer spaces the second undesir
Page 58 and 59: SYNTHESIS AND ANALYSIS OF THIOL-STA
Page 62 and 63:
QUINOXALINE-CONTAINING POLYFLUORENE
Page 64 and 65:
QUINOXALINE-CONTAINING POLYFLUORENE
Page 66 and 67:
66 CMDITR Review of Undergraduate R
Page 68 and 69:
SYNTHESIS OF DENDRON-FUNCTIONALIZED
Page 70 and 71:
Page 72 and 73:
BUILDING AN OPTICAL OXIMETER TO MEA
Page 74 and 75:
Page 76 and 77:
Page 78 and 79:
TOWARD MOLECULAR RESOLUTION C-AFM W
Page 80 and 81:
TOWARD MOLECULAR RESOLUTION C-AFM W
Page 82 and 83:
SYNTHESIS AND CHARACTERIZATION OF E
Page 84 and 85:
My name is Aaron Montgomery and I a
Page 86 and 87:
1,1-DIPHENYL-2,3,4,5-TETRAKIS(9,9-D
Page 88 and 89:
1,1-DIPHENYL-2,3,4,5-TETRAKIS(9,9-D
Page 90 and 91:
EFFECTS OF SURFACE CHEMISTRY ON CAD
Page 92 and 93:
EFFECTS OF SURFACE CHEMISTRY ON CAD
Page 94 and 95:
Page 96 and 97:
SYNTHESIS OF A POLYENE EO CHROMOPHO
Page 98 and 99:
SYNTHESIS OF A POLYENE EO CHROMOPHO
Page 102 and 103:
102 CMDITR Review of Undergraduate
Page 104 and 105:
CHARACTERIZATION OF THE MOLECULAR P
Page 106 and 107:
Page 108 and 109:
OPTIMIZATION OF SEMICONDUCTOR NANOP
Page 110 and 111:
OPTIMIZATION OF SEMICONDUCTOR NANOP
Page 112 and 113:
CHARACTERIZATION OF THE PHOTODECOMP
Page 114 and 115:
Page 116 and 117:
ELECTROLUMINESCENT PROPERTIES OF OR
Page 118 and 119:
Page 120 and 121:
DETERMINATION OF MOLECULAR ORIENTAT
Page 122 and 123:
DETERMINATION OF MOLECULAR ORIENTAT
Page 124 and 125:
HYDROGEL MATERIALS FOR TWO-PHOTON M
Page 126 and 127:
HYDROGEL MATERIALS FOR TWO-PHOTON M
Page 128 and 129:
THE DESIGN OF A FLUID DELIVERY SYST
Page 130:
THE DESIGN OF A FLUID DELIVERY SYST
show all

Student Project Abstracts 2005 - Pluto - University of Washington

You also want an ePaper? Increase the reach of your titles

Delete template?

Save as template?