?url_ver=Z39.88-2004&rft_val_fmt=info%3Aofi%2Ffmt%3Akev%3Amtx%3Adc&rft.relation=http%3A%2F%2Fd-scholarship-dev.library.pitt.edu%2F7527%2F&rft.title=Fabrication%2C+Ordering+and+Optical+Properties+of+Photonic+Crystals+Prepared+From+Crystalline+Colloidal+Arrays&rft.creator=Bohn%2C+Justin+Jeffrey&rft.description=We+developed+novel+understandings+pertaining+to+the+ordering+and+optical+properties+of+crystalline+colloidal+array+(CCA)+materials+and+applied+these+understandings+to+develop+novel+non-close-packed+inverted+photonic+crystal+materials.+CCA+materials+are+highly+charged+electrostatically+stabilized+colloidal+particles+in+water+which+readily+form+face+centered+cubic+or+body+centered+cubic+lattice+structures.+Because+their+periodicity+is+on+the+order+of+the+wavelength+of+light%2C+CCA+materials+have+the+ability+to+Bragg+diffract+light+in+the+UV%2C+visible+and+NIR+regions+of+the+electromagnetic+spectrum.+We+utilized+time+resolved+normal+incidence+reflection+spectroscopy+to+probe+the+degree+and+kinetics+of+CCA+ordering+during+the+CCA+crystallization+process.+Bragg+diffraction+interference+fringe+intensity+is+used+to+qualitatively+determine+the+overall+CCA+ordering+between+CCA+samples+which+have+incremental+additions+of+added+ionic+impurity.We+defined+the+physical+mechanism+for+anomalous+reflection+peaks+obtained+in+the+specular+reflection+direction+from+photonic+crystal+materials.+We+utilize+variable+angle+specular+reflection+spectroscopy+to+probe+angular+ranges+about+the+normal+to+the+(111)+planes+of+an+fcc+CCA+to+monitor+the+dispersion+of+anomalous+reflection+peaks.+We+correlated+these+reflection+peaks+to+the+diffraction+from+higher+order+Miller+index+crystal+planes+through+Bragg's+Law.+We+explain+the+origin+of+these+peaks+as+the+result+of+a+multiple+diffraction+process+whereby+light+is+first+Bragg+diffracted+into+a+beam+from+a+set+of+higher+order+Miller+index+planes+and+consecutively+diffracted+by+the+in+plane+(111)+periodicity+into+the+(111)+specular+reflection+direction.+We+also+uncovered+a+novel+use+for+CCA+and+PCCA+materials+allowing+us+to+fabricate+a+non-close-packed+inverted+photonic+crystal+material.+Our+novel+fabrication+method+consists+of+an+infiltration+and+condensation+of+a+sol-gel+precursor+into+the+hydrogel+matrix+of+a+PCCA+and+then+the+subsequent+removal+of+the+PCCA+material.+We+show+that+the+original+high+ordering+of+the+CCA+is+maintained+through+and+in-depth+study+which+examining+the+(111)+in-plane+ordering.+Tuning+the+CCA+particle+number+density%2C+prior+to+the+fabrication+process+provides+the+ability+to+readily+tune+the+Bragg+diffracted+wavelength+of+the+final+inverted+photonic+crystal.&rft.date=2010-06-16&rft.type=University+of+Pittsburgh+ETD&rft.type=PeerReviewed&rft.format=application%2Fpdf&rft.language=en&rft.identifier=http%3A%2F%2Fd-scholarship-dev.library.pitt.edu%2F7527%2F1%2FJustinBohn_ETD_2010.pdf&rft.identifier=++Bohn%2C+Justin+Jeffrey++(2010)+Fabrication%2C+Ordering+and+Optical+Properties+of+Photonic+Crystals+Prepared+From+Crystalline+Colloidal+Arrays.++Doctoral+Dissertation%2C+University+of+Pittsburgh.++++(Unpublished)++