TY  - UNPB
ID  - pittir16738
UR  - http://d-scholarship-dev.library.pitt.edu/16738/
A1  - Chao, Xing
Y1  - 2013/01/24/
N2  - The background and diffraction theory of crystalline colloidal arrays (CCAs) are briefly reviewed. Crystalline colloidal arrays were fabricated by using silica particles and polystyrene (PS) particles for deep ultraviolet (UV) and visible regions, respectively. I used a modified Stöber method to synthesize small (<100 nm) silica particles. The silica particles were surface functionalized with a strong acid, non-UV absorbing silane coupling agent. PS particles were also synthesized with emulsion polymerization method. These monodisperse, highly charged particles self-assemble into face-centered cubic CCAs that show Bragg diffraction of UV and visible light. The diffraction wavelength was 248 nm for silica CCA filter at normal incidence. The PS CCAs diffracted 518 nm and 580 nm light at normal incidence.
These CCA filters were tested with UV/vis/NIR spectrophotometer and lasers. UV/vis/NIR extinction showed high rejection efficiency and narrow diffraction bands. 244 nm argon laser light was used to study the transmission, reflection and scattering of the silica CCA filter. Teflon Raman scattering measurement was also performed with 244 nm light and a silica CCA filter used as the Rayleigh rejection filter. The filter rejected 99.91% of the Rayleigh scattering light.
We attempted to develop a Raman imaging spectrometer. Towards this affect, I attempted to do fluorescence imaging by using 514.5 argon laser light with PS visible filters. Spectra of fluorescence bands and fluorescence images were recorded.

KW  - crystalline colloidal arrays
KW  -  photonic crystals
KW  -  silica colloidal
KW  -  polystyrene colloidal
KW  -  UV Raman imaging
KW  -  Raman spectroscopy
KW  -  Rayleigh rejection filter
KW  -  wavelength-selecting filter
TI  - CRYSTALLINE COLLOIDAL ARRAY FILTER AND RAMAN IMAGING
EP  - 48
AV  - public
ER  -