Electrochemically grown photonic crystals

Optical properties of nanostructured metal films

“…36 The first example of electrochemical deposition through a colloidal template was reported by Braun and Wiltzius who described the electrochemical deposition of CdSe and CdS through templates assembled from 466 nm diameter polystyrene spheres assembled on a indium tin oxide electrode. 37 Subsequent work has extended this approach to the deposition of other semiconductors, 38,39 metals (notably platinum, gold, silver, cobalt, nickel tin/cobalt alloy), [40][41][42][43][44][45] metal oxides (ZnO and PbO 2 ), 46,47 and conducting polymers. [48][49][50] A recent review by Braun and Wiltzius concentrates on the electrochemical growth of photonic crystals.…”

Entropically driven self-assembly of colloidal crystals on templates in space

“…136,139,[240][241][242][248][249][250] With few exceptions, 251 the measurements have been complicated by the fact that the samples were not usually single crystals. These methods range from studies of the spectrum of embedded fluorescent molecules, to studies of transmission versus wavelength at fixed angle, to angle-dependent studies of reflection or transmission versus wavelength.…”

“…In fact, detailed measurements of photonic bandstructure have only been reported in relatively few cases, and most of these cases are restricted to direct structures with relatively weak particle scattering and some disorder, 151,[239][240][241][242][243][244][245] or to the inverted structures made, for example, by filling the voids in artificial opal with high index material, and then removing the opal, 74,75,125,156,246 or other variants of this scheme. 126,240,247,248 To date the inverted materials have demonstrated the most "photonic" behavior (though not a full gap). Thus measurements in many systems (e.g., direct structures with high index particles) are still desirable in order to test our basic understanding of photonics, and open up new ideas for the future.…”

Quantifying disorder in colloidal films spin-coated onto patterned substrates

“…8(a) we represent the number of loops, β norm 1 , for increasing filtration parameter δ for several experiments [data at (4,2) mm from the center of rotation]. β norm 1 is normalized in such a way that the maximum value for a perfect square lattice is 1.…”

“…Producing perfect, close-packed colloidal crystals is a cheap means to fabricate photonic band-gap materials [1][2][3]. Numerous techniques have been used to obtain well-ordered dried colloidal deposits [4][5][6][7][8][9][10][11][12][13][14][15][16][17].…”