Pressure-induced threshold optical pump intensity in a CdTe/ZnTe quantum dot

2016 ◽  
Vol 90 (3) ◽  
pp. 213-226 ◽  
Author(s):  
P. Sujanah ◽  
A. John Peter ◽  
Chang Woo Lee
Keyword(s):  
Quantum Dot ◽  
Pump Intensity ◽  
Optical Pump

scholarly journals Enhanced Terahertz Amplification Based on Photo-Excited Graphene-Dielectric Hybrid Metasurface

Nanomaterials ◽  
2020 ◽  
Vol 10 (12) ◽  
pp. 2448
Author(s):  
Shengnan Guan ◽  
Jierong Cheng ◽  
Tiehong Chen ◽  
Shengjiang Chang
Keyword(s):  
Transition Process ◽  
Pump Intensity ◽  
Gain Medium ◽  
Monolayer Graphene ◽  
Amplification Coefficient ◽  
Optical Pump ◽  
Dynamic Conductivity ◽  
Coupled Mode ◽  
Gain Loss ◽  
Terahertz Lasers

Graphene under optical pump has been shown to be an attractive gain medium with negative dynamic conductivity at terahertz frequencies. However, the amplification over a monolayer graphene is very weak due to its one-atom thickness. In this paper, the proposed graphene-dielectric reflective metasurface effectively improved terahertz field localization and enhanced coherent amplification. The amplification coefficient of 35 was obtained at 3.38 THz at room temperature with an infrared pump intensity of 8 W/mm2. As pump intensity increased from 0 to 15 W/mm2, we observed a loss–gain–loss transition process, which was discussed in detail through coupled-mode theory. In addition, amplification at different frequencies was achieved by merely re-optimizing the geometric parameters of the dielectric resonators. This study offers an effective solution for enhancing terahertz radiation and developing terahertz lasers.

Biodistribution 18F-markierter Quantum Dot-Antikörper-Biokonjugate

2019 ◽  
Author(s):  
O Mishchenko ◽  
A Schildan ◽  
O Sabri ◽  
M Patt
Keyword(s):  
Quantum Dot

Synchronization of Chaotic Quantum Dot Light Emitting Diodes under Optical Feedback Effect

2020 ◽  
pp. 144-148
Keyword(s):  
Quantum Dot ◽  
Delay Time ◽  
Chaos Synchronization ◽  
Optical Feedback ◽  
Light Emitting Diode ◽  
Feedback Effect ◽  
Complete Synchronization ◽  
Light Emitting ◽  
Coupling Methods ◽  
Coupling Parameters

Chaos synchronization of delayed quantum dot light emitting diode has been studied theortetically which are coupled via the unidirectional and bidirectional. at synchronization of chaotic, The dynamics is identical with delayed optical feedback for those coupling methods. Depending on the coupling parameters and delay time the system exhibits complete synchronization, . Under proper conditions, the receiver quantum dot light emitting diode can be satisfactorily synchronized with the transmitter quantum dot light emitting diode due to the optical feedback effect.

Vertical-cavity emitting devices with quantum-dot structures

2001 ◽  
Vol 171 (8) ◽  
pp. 855
Author(s):  
Viktor M. Ustinov ◽  
N.A. Maleev ◽  
Aleksei E. Zhukov ◽  
A.R. Kovsh ◽  
A.V. Sakharov ◽  
...  
Keyword(s):  
Quantum Dot ◽  
Vertical Cavity

Quantum Dot Bioconjugates as Energy Donors in Fluorescence Resonance Energy Transfer Assays

2003 ◽  
Vol 773 ◽  
Author(s):  
Aaron R. Clapp ◽  
Igor L. Medintz ◽  
J. Matthew Mauro ◽  
Hedi Mattoussi
Keyword(s):  
Energy Transfer ◽  
Quantum Dot ◽  
Organic Dyes ◽  
Resonance Energy Transfer ◽  
Resonance Energy ◽  
Genetically Engineered ◽  
Molar Ratio ◽  
Binding Assays ◽  
Specific Sequence ◽  
Donor Acceptor

AbstractLuminescent CdSe-ZnS core-shell quantum dot (QD) bioconjugates were used as energy donors in fluorescent resonance energy transfer (FRET) binding assays. The QDs were coated with saturating amounts of genetically engineered maltose binding protein (MBP) using a noncovalent immobilization process, and Cy3 organic dyes covalently attached at a specific sequence to MBP were used as energy acceptor molecules. Energy transfer efficiency was measured as a function of the MBP-Cy3/QD molar ratio for two different donor fluorescence emissions (different QD core sizes). Apparent donor-acceptor distances were determined from these FRET studies, and the measured distances are consistent with QD-protein conjugate dimensions previously determined from structural studies.

Pump-Probe Measurements Using Silicon Nanocrystal Waveguides

2003 ◽  
Vol 770 ◽  
Author(s):  
Nathanael Smith ◽  
Max J. Lederer ◽  
Marek Samoc ◽  
Barry Luther-Davies ◽  
Robert G. Elliman
Keyword(s):  
Probe Beam ◽  
Time Resolution ◽  
Pump Beam ◽  
Silicon Nanocrystals ◽  
Continuous Wave ◽  
Optical Gain ◽  
Optical Pump ◽  
Time Resolved ◽  
Pump Probe ◽  
Probe Measurements

AbstractOptical pump-probe measurements were performed on planar slab waveguides containing silicon nanocrystals in an attempt to measure optical gain from photo-excited silicon nanocrystals. Two experiments were performed, one with a continuous-wave probe beam and a pulsed pump beam, giving a time resolution of approximately 25 ns, and the other with a pulsed pump and probe beam, giving a time resolution of approximately 10 ps. In both cases the intensity of the probe beam was found to be attenuated by the pump beam, with the attenuation increasing monotonically with increasing pump power. Time-resolved measurements using the first experimental arrangement showed that the probe signal recovered its initial intensity on a time scale of 45-70 μs, a value comparable to the exciton lifetime in Si nanocrystals. These data are shown to be consistent with an induced absorption process such as confined carrier absorption. No evidence for optical gain was observed.

Quantum Dot Nanocrystals for In Vivo Molecular and Cellular Imaging¶

2004 ◽  
Vol 80 (3) ◽  
pp. 377 ◽  
Author(s):  
Andrew M. Smith ◽  
Xiaohu Gao ◽  
Shuming Nie
Keyword(s):  
Quantum Dot ◽  
Cellular Imaging
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