Nonlinear optical properties of cds quantum dots

... NONLINEAR OPTICAL PROPERTIES OF CdS QUANTUM DOTS HE JUN (M Sc Jilin University) A THESIS SUBMITTED FOR THE DEGREE OF DOCTOR OF PHILOSOPHY DEPARTMENT OF PHYSICS NATIONAL UNIVERSITY OF SINGAPORE ... values of the average radius and of the volume fraction of the NCs are necessary for the interpretation of the optical experiments and for assessing the magnitude of...

Ngày tải lên: 16/09/2015, 08:30

... the structural properties over a wide range by adjusting the materials and the process parameters Self-assembled quantum dots are created by filling of nanoholes in AlGaAs with GaAs Dependent ... publications A first functionalization of the nanoholes, the fabrication of a novel type of very uniform, strain-free GaAs QDs by filling of LDE nanoholes in AlGaAs with GaA...

Ngày tải lên: 22/06/2014, 00:20

... dot dimensions are smaller than the effective Bohr radius, we show that this interaction affects the excitonic effects of the secondorder nonlinear optical properties of semi-spherical quantum dots ... K-X: Exciton effects on the nonlinear optical rectification in one-dimesional quantum dots Phys Lett A 2005, 335:175 Baskoutas S, Paspalakis E, Terzis AF: E...

Ngày tải lên: 21/06/2014, 04:20

... other hand, off resonant nonlinearity has ultrafast response Semiconductor nanocrystals with large nonlinearity are also known to be attractive candidate materials for optical limiting Optical limiters ... induced damage We have synthesized a nanocomposite material incorporating strongly confined CdS nanocrystals of average size 3.4 nm stabilized in a synthetic glue matrix...

Ngày tải lên: 22/06/2014, 18:20

... investigated the structural and optical properties of type-II GaSb/InGaAs QDs grown on InP (100) substrate using molecular beam epitaxy [MBE] Experiments GaSb/InGaAs type-II QDs were grown on the (100) ... independent of the excitation power which is a typical feature of the type-I band transition Therefore, the interband transition of the GaS...

Ngày tải lên: 20/06/2014, 20:20

... one-dimensional electronic structure of InGaAs quantum dot molecules Microelectron Eng 2008, 85:1225-1228 Limwongse T, Panyakeow S, Kanjanachuchai S: Evolution of InAs quantum dots grown on cross-hatch ... InGaAs detector using standard lock-in detection technique Results and discussion The optical properties of the as-grown and annealed QDs on CHP structur...

Ngày tải lên: 21/06/2014, 01:20

... of the excitation power which is a typical feature of the type-I band transition Therefore, the interband transition of the GaSb QD would be the only proper origin of the highenergy peak In the ... and the nature of the direct transition type I transition It may be the reason that the PL intensity of the direct interband transition (type I) was strong as...

Ngày tải lên: 21/06/2014, 17:20

... of the excitation power which is a typical feature of the type-I band transition Therefore, the interband transition of the GaSb QD would be the only proper origin of the highenergy peak In the ... and the nature of the direct transition type I transition It may be the reason that the PL intensity of the direct interband transition (type I) was strong as...

Ngày tải lên: 22/06/2014, 00:20

... studies of high temperature photon emission statistics from SK-grown QDs [18–20] have been performed In this work we study the temperature dependence of the emission of a single, hierarchically self-assembled ... signature of a single quantum emitter The measured g(2)(0) does not reach its theoretical value of zero because of the presence of a weak uncorrelated backg...

Ngày tải lên: 22/06/2014, 22:20

... folate-decorated, quantum dots (QDs)-loaded nanoparticles of biodegradable polymers Biomaterials 2009, 30:1176 Alivisatos AP, Gu WW, Larabell C: Quantum dots as cellular probes Annual Review of ... shows the pattern of fibroblast proliferation as measured by BrdU assay after and 24 h of culture in media containing CSNPs, PCSNPs, and ICSNPs A significant difference in the...

Ngày tải lên: 20/06/2014, 22:20

... annealing Page of Conclusion We have studied the effects of a low-temperature AlGaAs capping layer on the optical properties of a GaAs QW, using different capping temperatures of 200, 350, 450, ... the interface and local charging effects due to defects in the AlGaAs capping layer are negligibly small The optical quality of the AlGaAs capping layer...

Ngày tải lên: 21/06/2014, 06:20

... doi:10.1007/s11671-010-9774-z Cite this article as: Zhai et al.: One-Pot Synthesis of Biocompatible CdSe/CdS Quantum Dots and Their Applications as Fluorescent Biological Labels Nanoscale Res Lett 2011 ... temperature, and 19 mg of Se powder was added Finally, the mixture was heated to 240°C and kept for a certain period of time such as 1, 5, 60, and 120...

Ngày tải lên: 21/06/2014, 08:20

... preparation of CdSe quantum dots (QDs) by sol-gel method and investigate their optical properties This is a new route to get CdSe QDs and also very economic We also estimate the average size of QDs ... prepared CdSe nanoparticles and the positions of the Xray peaks for CdSe FCC are shown in Fig All the diffraction peaks from the CdSe nanoparticles are consistent...

Ngày tải lên: 14/03/2014, 13:20

... asymptotically the value of the band-gap of the undoped Si-nw This is another indication of how doping can modify the electronic and optical properties of the Si nanostructures Conclusions 3.2 3.4 ... systematic analysis of the effect of the B and P codoping in Si-nw, concentrating not only on the structural properties but also on how doping i...

Ngày tải lên: 16/03/2014, 15:15

... Raman spectra of (a) nanocrystalline Si prepared by pulsed plasma processing and (b) porous silicon prepared by anodic etching using 488 nm line of Ar+ laser Optical properties of nano- silicon 287 ... 1⋅82 Optical properties of nano- silicon 289 clear distinction between hydrogen free and hydrogenated clusters Figure Plots of gap energy as a function of number of...

Ngày tải lên: 16/03/2014, 15:31