Enhancement of photoelectron emission efficiency from quantum dot solids, through electrical field biasing of interfaces

2021 ◽  
Vol 118 (26) ◽  
pp. 263104
Author(s):  
K. Eshraghi ◽  
P. R. Bandaru
Keyword(s):  
Quantum Dot ◽  
Photoelectron Emission ◽  
Electrical Field ◽  
Emission Efficiency

scholarly journals Dipolariton Formation in Quantum Dot Molecules Strongly Coupled to Optical Resonators

2019 ◽  
Vol 2019 ◽  
pp. 1-6 ◽  
Author(s):  
Marlon S. Domínguez ◽  
David F. Macias-Pinilla ◽  
Hanz Y. Ramírez
Keyword(s):  
Quantum Dot ◽  
Resonant Tunneling ◽  
Dipole Moments ◽  
Theoretical Work ◽  
Optical Resonators ◽  
Double Quantum ◽  
Strongly Coupled ◽  
Emission Efficiency ◽  
Quantum Dot Molecules ◽  
Exciton Polaritons

In this theoretical work, we study a double quantum dot interacting strongly with a microcavity, while undergoing resonant tunneling. Effects of interdot tunneling on the light-matter hybridized states are determined, and tunability of their brightness degrees, associated dipole moments, and lifetimes is demonstrated. These results predict dipolariton generation in artificial molecules coupled to optical resonators and provide a promising scenario for the control of emission efficiency and coherence times of exciton polaritons.

Tailoring of quantum dot emission efficiency by localized surface plasmon polaritons in self-organized mesoscopic rings

Nanoscale ◽  
2014 ◽  
Vol 6 (2) ◽  
pp. 741-744 ◽  
Author(s):  
Emanuela Margapoti ◽  
Denis Gentili ◽  
Matteo Amelia ◽  
Alberto Credi ◽  
Vittorio Morandi ◽  
...  
Keyword(s):  
Quantum Dot ◽  
Surface Plasmon ◽  
Surface Plasmon Polaritons ◽  
Localized Surface Plasmon ◽  
Emission Efficiency ◽  
Self Organized ◽  
Plasmon Polaritons

Enhanced Direct White Light Emission Efficiency in Quantum Dot Light‐Emitting Diodes via Embedded Ferroelectric Islands Structure

2021 ◽  
pp. 2104239
Author(s):  
Yuljae Cho ◽  
Sangyeon Pak ◽  
Benxuan Li ◽  
Bo Hou ◽  
SeungNam Cha
Keyword(s):  
Quantum Dot ◽  
White Light ◽  
Light Emitting Diodes ◽  
Light Emission ◽  
White Light Emission ◽  
Light Emitting ◽  
Emission Efficiency

Metamorphic quantum dot nanostructures for long wavelength operation with enhanced emission efficiency

2007 ◽  
Vol 27 (5-8) ◽  
pp. 1046-1051 ◽  
Author(s):  
L. Seravalli ◽  
P. Frigeri ◽  
P. Allegri ◽  
V. Avanzini ◽  
S. Franchi
Keyword(s):  
Quantum Dot ◽  
Long Wavelength ◽  
Emission Efficiency

Optofluidic Storage

2009 ◽  
Author(s):  
Bernardo Cordovez ◽  
David Erickson
Keyword(s):  
Quantum Dot ◽  
Data Storage ◽  
Storage Capacity ◽  
Visual Display ◽  
Diffraction Limit ◽  
Electrical Field ◽  
Fluorescent Signal ◽  
Pressure Driven Flow ◽  
Spectrometer Data ◽  
Applied Electrical Field

Optical storage capacity in devices such as DVDs is fundamentally restricted by the diffraction limit of light. We present an optofluidic approach which exploits nanofluidic manipulation of quantum dot cocktails to achieve spectrally multiplexed data storage in a traditional planar format. Quantum dot cocktails are delivered to the vicinity of a nanowell through pressure driven flow and are subsequently trapped and stored electrokinetically. Once in the nanowells, they are excited with a blue light source and their discrete spectrographic signal is captured through a fiber spectrometer. Data erasure is performed by reversing the polarity of the applied electrical field which ejects the nanocrystals. We also extend this analysis for microwell traps which could find use in visual display applications, as well as present a method by which the fluorescent signal can be controlled and retained over various timescales.

Terahertz Spectrometer Based on Femtosecond Laser for a Scientific Research

2014 ◽  
Vol 9 (2) ◽  
pp. 6-12
Author(s):  
Sergey Mikerin ◽  
Kristina Poteshkina ◽  
Aleksandr Plekhanov
Keyword(s):  
Complex Refractive Index ◽  
Sapphire Laser ◽  
External Control ◽  
Thz Radiation ◽  
Absolute Calibration ◽  
Electrical Field ◽  
Apparatus Function ◽  
Emission Efficiency ◽  
Experimental Stand ◽  
Optical Media

Terahertz (THz) spectrometer using femtosecond titanium-sapphire laser was developed. Experimental stand of the multi-purpose application was realized by using this spectrometer. It was realized to obtaining of the complex refractive index spectra of a large aperture samples and to research of the emission efficiency of THz radiation in a nonlinear optical media. It was proposed a method of spectrometer's absolute calibration by THz electrical field through an external control of polarization of the probe radiation. The threshold sensitivity to polarization changes was measured. It was 1.4 ± 0.5 μrad. It allows to estimate the threshold of THz field strength ~ 0.1 V/cm when zinc telluride crystal is used to detection. Width of the apparatus function of spectrometer was 9 GHz and it was estimated from the width of narrow lines of the water vapor in absorption spectrum of air gap. It well agrees with the theoretical estimation

Carrier capture before entering into a semiconductor quantum dot as a dominant pathway for the reduction of emission efficiency

2005 ◽  
Vol 98 (7) ◽  
pp. 073709 ◽  
Author(s):  
E. G. Lee ◽  
M. D. Kim ◽  
D. Lee ◽  
S. G. Kim
Keyword(s):  
Quantum Dot ◽  
Carrier Capture ◽  
Semiconductor Quantum Dot ◽  
Emission Efficiency

Carrier transport and emission efficiency in InGaN quantum-dot based light-emitting diodes

2017 ◽  
Vol 28 (27) ◽  
pp. 275201 ◽  
Author(s):  
Daniele Barettin ◽  
Matthias Auf der Maur ◽  
Aldo di Carlo ◽  
Alessandro Pecchia ◽  
Andrei F Tsatsulnikov ◽  
...  
Keyword(s):  
Quantum Dot ◽  
Carrier Transport ◽  
Light Emitting Diodes ◽  
Light Emitting ◽  
Emission Efficiency

The role of wetting layer states on the emission efficiency of InAs/InGaAs metamorphic quantum dot nanostructures

2009 ◽  
Vol 20 (27) ◽  
pp. 275703 ◽  
Author(s):  
L Seravalli ◽  
G Trevisi ◽  
P Frigeri ◽  
S Franchi ◽  
M Geddo ◽  
...  
Keyword(s):  
Quantum Dot ◽  
Wetting Layer ◽  
Emission Efficiency

Principles of Low-Vacuum SEM

1992 ◽  
Vol 50 (2) ◽  
pp. 1304-1305
Author(s):  
Klaus-Ruediger Peters
Keyword(s):  
New Technologies ◽  
High Vacuum ◽  
Optical Microscope ◽  
Specimen Surface ◽  
Electrical Field ◽  
Gaseous Environment ◽  
New Information ◽  
Gas Molecules ◽  
New Interactions ◽  
Gas Pressures

Only recently it became possible to expand scanning electron microscopy to low vacuum and atmospheric pressure through the introduction of several new technologies. In principle, only the specimen is provided with a controlled gaseous environment while the optical microscope column is kept at high vacuum. In the specimen chamber, the gas can generate new interactions with i) the probe electrons, ii) the specimen surface, and iii) the specimen-specific signal electrons. The results of these interactions yield new information about specimen surfaces not accessible to conventional high vacuum SEM. Several microscope types are available differing from each other by the maximum available gas pressure and the types of signals which can be used for investigation of specimen properties.Electrical non-conductors can be easily imaged despite charge accumulations at and beneath their surface. At high gas pressures between 10-2 and 2 torr, gas molecules are ionized in the electrical field between the specimen surface and the surrounding microscope parts through signal electrons and, to a certain extent, probe electrons. The gas provides a stable ion flux for a surface charge equalization if sufficient gas ions are provided.

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