Structural and Nonlinear Optical Properties of Self-Assembled SnO[sub 2]-Doped Silicon Nanorings Formed by Pulsed Laser Ablation

Abstract

SnO 2-doped Si nanorings with an outer diameter of 25 nm and an average width of 5 nm are grown by pulsed laser deposition. Atomic force microscopy reveals several interesting self-assembling forms of polycrystalline as well as an amorphous type of silicon nanorings. Depending on the width of the ring, the optical bandgap and photoluminescence can be tuned from the near infrared ͑1.38 eV͒ to the ultraviolet ͑3.02 eV͒, giving evidence for the strong quantum confinement effect along the width of ringlike quantum states. From Z-scan studies, the two-photon absorption coefficient is determined to be 2.2 ϫ 10 −6 m/W.

Substrate and buffer layer effect on the structural and optical properties of graphene oxide thin films

“…Overcoming current functional limitations in silicon and compound semiconductor electronics is one of the hottest areas of ongoing research activity. 7 This requires a detailed understanding of the atomic and electronic structure of nanometer-sized graphene and GO. Based on recent studies, 8 GO consists of phenol hydroxyl and epoxide functional groups on the top and bottom surfaces of each sheet, and carboxyl and carbonyl groups mostly at the sheet edges.…”

Epoxy to Carbonyl Group Conversion in Graphene Oxide Thin Films: Effect on Structural and Luminescent Characteristics

“…3 It is one of the hottest areas of ongoing research activity to get over current functional limitation in silicon and compound semiconductor electronics. 4 GO consists of phenol hydroxyl and epoxide functional groups on the top and bottom surfaces of each sheet and sp 2 -hybridized carbons containing carboxyl and carbonyl groups mostly at the sheet edges, and these groups offer tremendous opportunities for access to functionalized graphene-based materials. The oxidation of graphite to GO breaks up the sp 2 -hybridized structure of the stacked graphene sheets, and the disruption of graphene lattice is reflected in an increase in interlayer spacing from 0.335 nm for graphite to more than 1 nm for GO.…”

“…Bao et al reported graphene–polymer nanofiber membrane as efficient photonic materials for the generation of ultrashort pulses in fiber lasers . It is one of the hottest areas of ongoing research activity to get over current functional limitation in silicon and compound semiconductor electronics . GO consists of phenol hydroxyl and epoxide functional groups on the top and bottom surfaces of each sheet and sp 2 -hybridized carbons containing carboxyl and carbonyl groups mostly at the sheet edges, and these groups offer tremendous opportunities for access to functionalized graphene-based materials.…”

Ni doping induced property enhancement in laser ablated BaSnO3 films suitable for optoelectronic applications

“…We have observed a similar film thickness enhancement when BaSnO 3 films are deposited with two other dopants, which are magnetic in nature, say, Fe 3+ and Mn 4+ , under the same deposition conditions using PLD which is not a part of this manuscript. In this context, we wish to point out that we have so far deposited films of many materials with several non-magnetic dopants using PLD [ [36] , [37] , [38] , [39] ]. However, we have not observed such an unusual increase in film thickness in those cases.…”