Effects of Non-Uniform Size Distrubution on the Spectral Optical Gain Properties of InGaAs/InGaAsP Quantum Dots

2019 ◽  
Vol 4 (1) ◽  
pp. 385-390
Author(s):  
J. R. Mialichi ◽  
N. C. Frateschi
Keyword(s):  
Quantum Dots ◽  
Optical Gain ◽  
Uniform Size

scholarly journals Coupled InGaAs Quantum Dots for Electro-Optic Modulation

Crystals ◽  
2021 ◽  
Vol 11 (10) ◽  
pp. 1159
Author(s):  
Kuei-Ya Chuang ◽  
Te-En Tzeng ◽  
Tsong-Sheng Lay
Keyword(s):  
Quantum Dots ◽  
Optical Gain ◽  
Single Mode ◽  
Uniform Size ◽  
Optical Wavelength ◽  
Triple Layer ◽  
Electro Optic ◽  
Fabry Perot ◽  
Accumulated Strain ◽  
Vertically Aligned

We investigated the growth of vertically coupled In0.75Ga0.25As quantum dots (QDs) by varying the GaAs spacer thickness (d). Vertically-aligned triple-layer QDs of uniform size and highest accumulated strain are formed with d = 5 nm. The electroluminescence (EL) characteristics for In0.75Ga0.25As QDs show an emission spectrum at optical wavelength (λ) of 1100−1300 nm. The EL spectra exhibit the highest optical gain at λ ~ 1200 nm, and the narrowest FWHM = 151 nm of the sample with d = 5 nm at injection current = 20 mA. Fabry–Perot measurements at λ = 1515 nm of TE and TM polarizations were carried out to investigate the electro-optic modulation for a single-mode ridge waveguide consisting of vertically-coupled triple-layer In0.75Ga0.25As QDs (d = 5 nm). The linear (r) and quadratic (s) electro-optic coefficients are r = 2.99 × 10−11 m/V and s = 4.10 × 10−17 m2/V2 for TE polarization, and r = 1.37 × 10−11 m/V and s = 3.2 × 10−17 m2/V2 for TM polarization, respectively. The results highlight the potential of TE/TM lightwave modulation by InGaAs QDs at photon energy below energy band resonance.

scholarly journals Achieving Optical Gain of the CsPbBr3 Perovskite Quantum Dots and Influence of the Variable Stripe Length Method

ACS Omega ◽  
2021 ◽  
Author(s):  
Saif M. H. Qaid ◽  
Hamid M. Ghaithan ◽  
Bandar Ali Al-Asbahi ◽  
Abdullah S. Aldwayyan
Keyword(s):  
Quantum Dots ◽  
Optical Gain ◽  
Perovskite Quantum Dots ◽  
Stripe Length

State-resolved manipulations of optical gain in semiconductor quantum dots: Size universality, gain tailoring, and surface effects

2009 ◽  
Vol 131 (16) ◽  
pp. 164706 ◽  
Author(s):  
Ryan R. Cooney ◽  
Samuel L. Sewall ◽  
D. M. Sagar ◽  
Patanjali Kambhampati
Keyword(s):  
Quantum Dots ◽  
Optical Gain ◽  
Surface Effects ◽  
Semiconductor Quantum Dots

scholarly journals Multi-Quantum Dots-Embedded Silica-Encapsulated Nanoparticle-Based Lateral Flow Assay for Highly Sensitive Exosome Detection

Nanomaterials ◽  
2021 ◽  
Vol 11 (3) ◽  
pp. 768
Author(s):  
Hyung-Mo Kim ◽  
Chiwoo Oh ◽  
Jaehyun An ◽  
Seungki Baek ◽  
Sungje Bock ◽  
...  
Keyword(s):  
Quantum Dots ◽  
Limit Of Detection ◽  
Specific Binding ◽  
Calf Serum ◽  
Lateral Flow ◽  
Lateral Flow Immunoassay ◽  
Uniform Size ◽  
Highly Sensitive ◽  
Wide Range ◽  
New Biomarkers

Exosomes are attracting attention as new biomarkers for monitoring the diagnosis and prognosis of certain diseases. Colorimetric-based lateral-flow assays have been previously used to detect exosomes, but these have the disadvantage of a high limit of detection. Here, we introduce a new technique to improve exosome detection. In our approach, highly bright multi-quantum dots embedded in silica-encapsulated nanoparticles (M–QD–SNs), which have uniform size and are brighter than single quantum dots, were applied to the lateral flow immunoassay method to sensitively detect exosomes. Anti-CD63 antibodies were introduced on the surface of the M–QD–SNs, and a lateral flow immunoassay with the M–QD–SNs was conducted to detect human foreskin fibroblast (HFF) exosomes. Exosome samples included a wide range of concentrations from 100 to 1000 exosomes/µL, and the detection limit of our newly designed system was 117.94 exosome/μL, which was 11 times lower than the previously reported limits. Additionally, exosomes were selectively detected relative to the negative controls, liposomes, and newborn calf serum, confirming that this method prevented non-specific binding. Thus, our study demonstrates that highly sensitive and quantitative exosome detection can be conducted quickly and accurately by using lateral immunochromatographic analysis with M–QD–SNs.

Facile and Large-scale Synthesis of Graphene Quantum Dots Functionalized with Morpholine for Selective Targeting and Imaging of Lysosome

NANO ◽  
2021 ◽  
pp. 2150113
Author(s):  
Yingying Nie ◽  
Zengjie Fan
Keyword(s):  
Quantum Dots ◽  
Large Scale ◽  
Graphene Quantum Dots ◽  
Diagnosis And Treatment ◽  
Uniform Size ◽  
Scale Method ◽  
Selective Targeting ◽  
Application Potential ◽  
Good Biocompatibility ◽  
Imaging Properties

The lack of targeting selection to lysosome limits the application of graphene quantum dots (GQDs) in the diagnosis and treatment of lysosome-related disease. In this study, we developed a facile, environmentally friendly and large-scale method to prepare [Formula: see text]-aminomorpholine (Am)-modified GQDs (Am-GQDs) via a simple hydrothermal method. The physicochemical, optical, biocompatible and targeted imaging properties were evaluated systematically. The results indicated that the synthesized Am-GQDs had a uniform size distribution and the size was around 2[Formula: see text]nm. In addition, the synthesized Am-GQDs had excellent optical properties, fluorescent stability, and good biocompatibility. More importantly, they can selectively target and image lysosome in a relatively short coculture time with cells, demonstrating their application potential in the diagnosis and treatment of lysosomal-related diseases.

scholarly journals Electronic Structure and Optical Gain of InNBiAs/InP Pyramidal Quantum Dots

2017 ◽  
Vol 215 ◽  
pp. 31-35
Author(s):  
Zhigang Song ◽  
Sumanta Bose ◽  
W.J. Fan ◽  
X.H. Tang ◽  
D.H. Zhang ◽  
...  
Keyword(s):  
Quantum Dots ◽  
Electronic Structure ◽  
Optical Gain

scholarly journals Ultra-fast charge carrier dynamics across the spectrum of an optical gain media based on InAs/AlGaInAs/InP quantum dots

AIP Advances ◽  
2017 ◽  
Vol 7 (3) ◽  
pp. 035122 ◽  
Author(s):  
I. Khanonkin ◽  
A. K. Mishra ◽  
O. Karni ◽  
V. Mikhelashvili ◽  
S. Banyoudeh ◽  
...  
Keyword(s):  
Quantum Dots ◽  
Charge Carrier ◽  
Optical Gain ◽  
Carrier Dynamics ◽  
Fast Charge ◽  
Charge Carrier Dynamics ◽  
Inp Quantum Dots ◽  
Gain Media

Nanoindentation Assisted Self-Assembly of Quantum Dots

2006 ◽  
Author(s):  
Curtis Taylor ◽  
Eric Stach ◽  
Gregory Salamo ◽  
Ajay Malshe
Keyword(s):  
Quantum Dots ◽  
Self Assembly ◽  
Surface Strain ◽  
Ex Situ ◽  
Atomic Step ◽  
Uniform Size ◽  
Force Microscopy ◽  
Atomic Force ◽  
And Performance ◽  
Spatial Positioning

The ability to pattern quantum dots with high spatial positioning and uniform size is critical for the realization of future electronic devices with novel properties and performance that surpass present technology. This work discusses the exploration of an innovative nanopatterning technique to direct the self-assembly of nanostructures. The technique focuses on perturbing surface strain energy by nanoindentation in order to mechanically bias quantum dot nucleation. Growth of InAs quantum dots on nanoindent templates is performed using molecular beam epitaxy (MBE). The effect of indent spacing and size on the patterned growth is investigated. The structural analysis of the quantum dots including spatial ordering, size, and shape are characterized by ex-situ atomic force microscopy (AFM). Results reveal that the indent patterns clearly bias nucleation with dot structures selectively growing on top of each indent. It is speculated that the biased nucleation is due to a combination of favorable surface strain attributed to subsurface dislocation strain fields and/or multi-atomic step formation at the indent sites, which leads to increased adatom diffusion on the patterned area.

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