Effect of Quantum Confinement on Optical Properties of Ge Nanocrystals in GeO[sub 2] Films

2005 ◽  
Vol 39 (10) ◽  
pp. 1168 ◽  
Author(s):  
E. B. Gorokhov
Keyword(s):  
Optical Properties ◽  
Quantum Confinement ◽  
Ge Nanocrystals

Synthesis and optical properties of MoS2 and isomorphous nanoclusters in the quantum confinement regime

1997 ◽  
Vol 81 (12) ◽  
pp. 7934-7944 ◽  
Author(s):  
J. P. Wilcoxon ◽  
P. P. Newcomer ◽  
G. A. Samara
Keyword(s):  
Optical Properties ◽  
Quantum Confinement

Optical Properties of Zn1-xCdxS Nanoparticles in the Quantum Confinement Regime

2010 ◽  
Vol 6 (1) ◽  
pp. 94-98 ◽  
Author(s):  
Amit Chawla ◽  
Sonal Singhal ◽  
Hari Gupta ◽  
Ramesh Chandra
Keyword(s):  
Optical Properties ◽  
Quantum Confinement

scholarly journals Strong Quantum Confinement Effect in the Optical Properties of Ultrathin α-In2Se3

2016 ◽  
Vol 4 (12) ◽  
pp. 1939-1943 ◽  
Author(s):  
Jorge Quereda ◽  
Robert Biele ◽  
Gabino Rubio-Bollinger ◽  
Nicolás Agraït ◽  
Roberto D'Agosta ◽  
...  
Keyword(s):  
Optical Properties ◽  
Quantum Confinement ◽  
Quantum Confinement Effect ◽  
Confinement Effect

Classical versus ab initio structural relaxation: electronic excitations and optical properties of Ge nanocrystals embedded in a SiC matrix

2004 ◽  
Vol 832 ◽  
Author(s):  
Giancarlo Cappellini ◽  
H.-Ch. Weissker ◽  
D. De Salvator ◽  
J. Furthmüller ◽  
F. Bechstedt ◽  
...  
Keyword(s):  
Molecular Dynamics ◽  
Optical Properties ◽  
Ab Initio ◽  
First Principles ◽  
Electronic Excitation ◽  
First Principle ◽  
Electronic Excitations ◽  
Combined Method ◽  
Classical Molecular Dynamics ◽  
Ge Nanocrystals

ABSTRACTWe discuss and test a combined method to efficiently perform ground- and excited-state calculations for relaxed structures using both a quantum first-principles approach and a classical molecular-dynamics scheme. We apply this method to calculate the ground state, the optical properties, and the electronic excitations of Ge nanoparticles embedded in a cubic SiC matrix. Classical molecular dynamics is used to relax the large-supercell system. First-principles quantum techniques are then used to calculate the electronic structure and, in turn, the electronic excitation and optical properties. The proposed procedure is tested with data resulting from a full first-principles scheme. The agreement is quantitatively discussed between the results after the two computational paths with respect to the structure, the optical properties, and the electronic excitations. The combined method is shown to be applicable to embedded nanocrystals in large simulation cells for which the first-principle treatment of the ionic relaxation is presently out of reach, whereas the electronic, optical and excitation properties can already be obtained ab initio. The errors incurred from the relaxed structure are found to be non-negligible but controllable.

scholarly journals Tailoring Blue-Green Double Emissions in Carbon Quantum Dots via Co-Doping Engineering by Competition Mechanism between Chlorine-Related States and Conjugated π-Domains

Nanomaterials ◽  
2018 ◽  
Vol 8 (9) ◽  
pp. 635 ◽  
Author(s):  
Xue Sun ◽  
Huilian Liu ◽  
Lili Yang ◽  
Xinying Wang ◽  
Weiqiang Yang ◽  
...  
Keyword(s):  
Quantum Dots ◽  
Optical Properties ◽  
Reaction Time ◽  
Quantum Confinement ◽  
Quantum Confinement Effect ◽  
Carbon Quantum Dots ◽  
Confinement Effect ◽  
Co Doping ◽  
Photoelectric Properties ◽  
Co Doped

Representing single-layer to tens of layers of graphene in a size less than 30 nm, carbon quantum dots (CQDs) is becoming an advanced multifunctional material for its unique optical, electronic, spin and photoelectric properties induced by the quantum confinement effect and edge effect. In present work, upon co-doping engineering, nitrogen and chlorine co-doped CQDs with uniquely strong blue-green double emissions are developed via a facile and one-pot hydrothermal method. The crystalline and optical properties of CQDs have been well manipulated by tuning the mole ratio of nitrogen/chlorine and the reaction time. The characteristic green emission centered at 512 nm has been verified, originating from the chlorine-related states, the other blue emissions centered at 460 nm are attributed to the conjugated π-domain. Increasing the proportion of 1,2,4-benzentriamine dihydrochloride can effectively adjust the bandgap of CQDs, mainly caused by the synergy and competition of chlorine-related states and the conjugated π-domain. Prolonging the reaction time promotes more nitrogen and chlorine dopants incorporate into CQDs, which inhibits the growth of CQDs to reduce the average size of CQDs down to 1.5 nm, so that the quantum confinement effect dominates into play. This work not only provides a candidate with excellent optical properties for heteroatoms-doped carbon materials but also benefits to stimulate the intensive studies for co-doped carbon with chlorine as one of new dopants paradigm.

Optical Properties of Multilayered Ge Nanocrystals Embedded in SiOx GeNy Thin Films

2017 ◽  
Vol 17 (5) ◽  
pp. 3519-3522
Author(s):  
Xiaojing Liu ◽  
Fei Gao ◽  
Haoshi Wang ◽  
Shengzhong Liu ◽  
Liangmin Zhang
Keyword(s):  
Thin Films ◽  
Optical Properties ◽  
Ge Nanocrystals

GaSb/InGaAsSb/GaSb SINGLE AND MULTIPLE QUANTUM WELLS: OPTICAL PROPERTIES ENGINEERING AND APPLICATION

2007 ◽  
Vol 06 (05) ◽  
pp. 315-318 ◽  
Author(s):  
A. A. KOVALYOV ◽  
O. P. PCHELYAKOV ◽  
V. V. PREOBRAZHENSKII ◽  
M. M. PUTYATO ◽  
N. N. RUBTSOVA ◽  
...  
Keyword(s):  
Optical Properties ◽  
Quantum Wells ◽  
Quantum Confinement ◽  
Multiple Quantum Wells ◽  
Saturable Absorption ◽  
Multiple Quantum ◽  
Transmission Spectra ◽  
Single Quantum Well ◽  
Mbe Growth ◽  
High Reflection

MBE growth of GaSb / InGaAsSb / GaSb heterostructures of high crystal quality is performed under continual RHEED control. Transmission spectra of the films forming multiple quantum wells in λ ≈ 2–3 μm region confirm possibility to control optical properties of the structures through quantum confinement and through the content of semiconductor elements. New design of saturable absorption semiconductor mirror (SESAM) for Cr 2+: ZnSe laser is proposed and manufactured on the base of the single quantum well GaSb / InGaAsSb / GaSb placed between dielectric antireflection and broadband high reflection coatings.

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