Hybrid Plasmonic–Photonic Nanostructures: Gold Nanocrescents Over Opals

Abstract

The interaction of localized surface plasmon resonances (LSPRs) with the\ud photonic modes in an opal photonic crystal is reported. Gold nanocrescents\ud are evaporated at glancing angles over both microsphere monolayers and\ud artifi cial opals. Microsphere monolayers allow the three localised plasmonic\ud resonances observed in the nanocrescent optical spectra to be identifi ed. By\ud changing the microsphere diameter, the opal photonic stop band and a selected\ud plasmonic resonance can be spectrally overlapped causing a dramatic\ud change of the properties of both excitations. The creation of new modes is observed,\ud whose spectral position and dispersion properties are a combination\ud of those localised in nanoparticle plasmons and in the photonic crystal

A colloidoscope of colloid-based porous materials and their uses

“…112 Interesting coupling effects can be observed between the photonic modes of an opal and the plasmonic modes of thin metals deposited on top of the crystal. [189][190][191][192][193] Colloids can also be used for antireflective coating applications. 85 In particular, colloidal monolayers have been used to create porous, graded-index materials with low reflectivity by, for example, plasma etching of colloidal monolayers, 194 inverting the monolayer, 95 or using the monolayer as an etching mask to generate pillars.…”

Nanostructure for Hybrid Plasmonic–Photonic Crystal Formed on Gel-Immobilized Colloidal Crystal Observed by AFM after Drying

“…Enhancement of the optical electric field stronger than that due to the LSP alone was reported. Au nanoparticles/nanostructure were used to exhibit the LSP resonance by some studies 4,6 because of the chemical stability of Au. Thus, robustness in applications is expected.…”

“…On the other hand, Ag nanoparticles/nanostructure were employed in some studies 1, 2, 5, 3 because of their high performance of the electric field enhancement. For the photonic crystal material, polystyrene (a regular array of particles or a regular pattern) was selected in some studies, 2,4,3,6 while poly(methyl methacrylate) was used by Xu et al 5 and silica was used by Kim et al 1 An advantage of polystyrene is narrow particle size dispersity. Polystyrene suspensions with the dispersity less than few percent in the coefficient of variation can be synthesized by a soap-free emulsion polymerization.…”

Second Harmonic Generation Circular Dichroism from Self‐Ordered Hybrid Plasmonic–Photonic Nanosurfaces

“…[ 31 ] By taking advantage of this effect, enhancement in the SHG effi ciency by 4 orders of magnitude has been reported. [ 34 ] The spheres form a self-ordered closepacked polycrystalline hexagonal monolayer, with domain sizes in the range of several tens of micrometers and random inplane orientation. Self-ordered dielectric nanospheres partially covered by thin (approximately 10 nm) Au nano-crescents were studied by measuring the optical SHG under different polarization state excitation.…”

“…[ 34 ] The spheres form a self-ordered closepacked polycrystalline hexagonal monolayer, with domain sizes in the range of several tens of micrometers and random inplane orientation. [ 34 ] The spheres form a self-ordered closepacked polycrystalline hexagonal monolayer, with domain sizes in the range of several tens of micrometers and random inplane orientation.…”