Silicon nanocrystals for nonlinear optics and secure communications

Bisadi, Zahra; Mancinelli, Mattia; Manna, Santanu; Tondini, Stefano; Bernard, Martino; Samusenko, A.; Ghulinyan, Mher; Fontana, G.; Bettotti, Paolo; Ramiro‐Manzano, Fernando; Pucker, G.; Pavesi, L.

doi:10.1002/pssa.201532528

Cited by 20 publications

(15 citation statements)

References 38 publications

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“…Quantum size effects change the properties of Si-nc with respect to bulk silicon; this allows enlargement of the phenomenology and the application spectrum of silicon photonics. 58…”

Section: Nonlinear Optical Studies Of Silicon-based Materialsmentioning

confidence: 99%

Nonlinear optical properties of metal nanoparticles: a review

2017

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Metal nanoparticles (MNPs) hold great technological promise because of the possibility of engineering their electronic and optical properties through material design. One of the effective methods to fabricate MNPs is ion implantation. In this review, recent results on the nonlinear optical properties of nanoparticles (including copper, silver, gold, and bismuth nanoparticles) doped in various bases have been discussed. Some specific optical nonlinear properties, such as nonlinear refraction, two-photon absorption, and optical limiting, for femtosecond, picosecond, and nanosecond laser pulses have also been covered. In addition to ion implantation, we have summarized several other methods for the preparation of composite materials, and Z-scan has been used to study the nonlinear optical properties of these materials.

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“…Quantum size effects change the properties of Si-nc with respect to bulk silicon; this allows enlargement of the phenomenology and the application spectrum of silicon photonics. 58…”

Section: Nonlinear Optical Studies Of Silicon-based Materialsmentioning

confidence: 99%

Nonlinear optical properties of metal nanoparticles: a review

2017

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“…[10] . 5 The possibility to exploit the size, shape and surface termination [30] of the Si-NCs togheter with their low toxicity and good biocompatibility has prompted their application in several broad fields such as microeletronics [2,31,32], photonics [33,34], non-linear optics [35,36,37], secure communications [36], photovoltaics, in the so-called third-generation solar cells, solar fuels [3,38,39,40,41,42,43], thermoelectrics [44,45] and biomedicine [46,47,48,49,50].…”

Section: Introductionmentioning

confidence: 99%

Doped and codoped silicon nanocrystals: The role of surfaces and interfaces

Marri

Degoli

Ossicini

2017

Progress in Surface Science

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Si nanocrystals have been extensively studied because of their novel properties and their potential applications in electronic, optoelectronic, photovoltaic, thermoelectric and biological devices. These new properties are achieved through the combination of the quantum confinement of carriers and the strong influence of surface chemistry. As in the case of bulk Si the tuning of the electronic, optical and transport properties is related to the possibility of doping, in a controlled way, the nanocrystals. This is a big challenge since several studies have revealed that doping in Si nanocrystals differs from the one of the bulk. Theory and experiments have underlined that doping and codoping are influenced by a large number of parameters such as size, shape, passivation and chemical environment of the silicon nanocrystals. However, the connection between these parameters and dopant localization as well as the occurrence of self-purification effects are still not clear. In this review we summarize the latest progress in this fascinating research field considering free-standing and matrix-embedded Si nanocrystals both from the theoretical and experimental point of view, with special attention given to the results obtained by ab-initio calculations and to size-, surface- and interface-induced effects

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“…The advent of nanoscience and nanotechnologies and the consequent scaling down of Si structures to nanometer sizes have opened new interesting opportunities. In particular the possibility to play with the size, shape and surface termination of silicon nanocrystals (Si‐NCs) togheter with their low toxicity and good biocompatibility has prompted their application in microeletronics, photonics, non‐linear optics, photovoltaics, thermoelectrics, and biomedicine . Moreover the doping of Si‐NCs, as in the case of bulk semiconductor devices, can be used to alter in a controllable way the electronic, optical and transport properties of the nanomaterials.…”

Section: Introductionmentioning

confidence: 99%

First Principle Studies of B and P Doped Si Nanocrystals

Marri

Degoli

Ossicini

2017

Physica Status Solidi (a)

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The properties of n- and p-doped silicon nanocrystals obtained through ab initio calculations are reviewed here. The aim is the understanding of the effects induced by substitutional doping on the structural, electronic and optical properties of free-standing and matrix-embedded Si nanocrystals. The preferential positioning of the dopants and their effects on the structural properties with respect to the undoped case, as a function of the nanocrystals diameter and termination, are identified through total-energy considerations. The localization of the acceptor and donor related levels in the band gap of the Si nanocrystals, together with the impurity activation energy, are discussed as a function of the nanocrystals size. The dopant induced differences in the optical properties with respect to the undoped case are presented. Finally, the case of B and P co-doped nanocrystals is discussed showing that if carriers are perfectly compensated, the Si nanocrystals undergo a minor structural distortion around the impurities inducing a significant decrease of the impurities formation energies with respect to the single doped case. Due to co-doping, additional peaks are introduced in the absorption spectra, giving rise to a size-dependent red shift of the absorption spectra

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Silicon nanocrystals for nonlinear optics and secure communications

Cited by 20 publications

References 38 publications

Nonlinear optical properties of metal nanoparticles: a review

Nonlinear optical properties of metal nanoparticles: a review

Doped and codoped silicon nanocrystals: The role of surfaces and interfaces

First Principle Studies of B and P Doped Si Nanocrystals

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