Controlled Pixelation of Inverse Opaline Structures Towards Reflection‐Mode Displays

Abstract

Pixelated inverse opals with red, green, and blue colors were prepared by hybridizing convective assembly of colloidal particles and photolithography techniques. The brilliant structural colors, high mechanical stability, and small feature size of the pixels were simultaneously accomplished, thereby providing color reflectors potentially useful for display devices. Moreover, this hybridized method provides a general means to create multi-colored photonic crystals.

Patterned Colloidal Photonic Crystals

“…[43] In this system, the color of the PCs comes from 1D nanochains containing periodically arranged Fe 3 O 4 nanospheres.T he length and periodicity of the nanochains could be controlled by the timing and duration of the magnetic exposure, [43][44][45][46][47] respectively.T he resolution of this multicolor PC pattern is as high as that achieved by lithography because it is determined by the resolution of the optical system. Another strategy starts from well-assembled PC films.U sing selective UV-exposure,Y ang and coworkers constructed aseries of patterned PC devices for anticounterfeiting measures, [48] displays, [49] and sensors. [50] Selective modification can be used to produce PC patterns simply but efficiently.Aizenberg and co-workers reported an inverse opal (i-opal) PC sensor for the colorimetric determination of solvents based on patterned wetting on the selectively modified PC film ( Figure 3b).…”

“…[111] Each microsphere can act as an independent pixel unit in the multipixel array,a nd the microsphere can be micro-manipulated by amagnetic needle to its on or off state.T he pattern can be precisely controlled by what one writes using the magnetic needle.B yu sing photolithography,K im et al constructed ap atterned PC RGB device for reflection-mode display (Figure 8d). [49] Song et al printed aP Cp attern consisting of fluorescence molecule-doped PC domes for fluorescence display (Figure 8e). [34] Thef luorescence emission of the PC dome is angle-independent, which is ab enefit for wide viewing-angle displays.…”

“…d) Patterned PC RGB device for reflection-mode display.Reproduced with permission. [49] Copyright 2014, Wiley-VCH.e )Angle-independent fluorescence display device consistingo ffluorescence molecule-doped PC domes for wide viewing-angle display.R eproducedw ith permission. [34] Copyright 2014, Wiley-VCH.…”

Quasiguided modes of opaline photonic crystals covered by Ge2Sb2Te5

“…Opals having photonic stop-bands in the visible range demonstrate shimmered interference colors. This fact not only provokes interest in opals from the viewpoint of jewellery but makes them promising for colorimetric sensors 1,2 , solar cells [3][4][5] and microdisplays [6][7][8] .…”

Design of DNA Origami Diamond Photonic Crystals

“…A solution molding process could enable the transformation of the as-assembled DNA origami lattice into a porous silicon-or germanium-coated composite crystal with enhanced refractive index contrast, in that a champion relative bandwidth for the photonic bandgap (i.e., 0.29) could become possible even for a relatively low volume fraction (i.e., 16 vol%).Main manuscript: Since the pioneering works of E. Yablonovitch 1 and S. John in 1987 2 , photonic crystals have transformed various fields including lasers, optomechanics, optoelectronics, and structural colorizations. [3][4][5][6][7][8][9][10][11][12][13][14][15] According to on-demand applications,…”