Optical Gain and Stimulated Emission in Nanocrystal Quantum Dots

Science ◽  
2000 ◽  
Vol 290 (5490) ◽  
pp. 314-317 ◽  
Author(s):  
V. I. Klimov
Keyword(s):  
Quantum Dots ◽  
Optical Gain ◽  
Stimulated Emission ◽  
Nanocrystal Quantum Dots

scholarly journals Nanocrystal Quantum Dots: Building Blocks for Tunable Optical Amplifiers and Lasers

2001 ◽  
Vol 667 ◽  
Author(s):  
Jennifer A. Hollingsworth ◽  
Alexander A. Mikhailovsky ◽  
Anton Malko ◽  
Victor I. Klimov ◽  
Catherine A. Leatherdale ◽  
...  
Keyword(s):  
Quantum Dots ◽  
Quantum Confinement ◽  
Optical Amplifiers ◽  
Optical Gain ◽  
Building Blocks ◽  
Stimulated Emission ◽  
Optical Amplification ◽  
Organometallic Reactions ◽  
Wide Range ◽  
Nanocrystal Quantum Dots

ABSTRACTWe study optical processes relevant to optical amplification and lasing in CdSe nanocrystal quantum dots (NQD). NQDs are freestanding nanoparticles prepared using solution-based organometallic reactions originally developed for the Cd chalcogenides, CdS, CdSe and CdTe [J. Am. Chem. Soc. 115, 8706 (1993)]. We investigate NQDs with diameters ranging from 2 to 8 nm. Due to strong quantum confinement, they exhibit size-dependent spectral tunability over an energy range as wide as several hundred meV. We observe a strong effect of the matrix/solvent on optical gain properties of CdSe NQDs. In most of the commonly used solvents (such as hexane and toluene), gain is suppressed due to strong photoinduced absorption associated with carriers trapped at solvent-related interface states. In contrast, matrix-free close packed NQD films (NQD solids) exhibit large optical gain with a magnitude that is sufficiently high for the optical gain to successfully compete with multiparticle Auger recombination [Science 287, 10117 (2000)]. These films exhibit narrowband stimulated emission at both cryogenic and room temperature, and the emission color is tunable with dot size [Science 290, 314 (2000)]. Moreover, the NQD films can be incorporated into microcavities of different geometries (micro-spheres, wires, tubes) that produce lasing in whispering gallery modes. The facile preparation, chemical flexibility and wide-range spectral tunability due to strong quantum confinement are the key advantages that should motivate research into NQD applications in optical amplifiers and lasers.

scholarly journals Optical gain from InAs nanocrystal quantum dots in a polymer matrix

2005 ◽  
Vol 87 (25) ◽  
pp. 251108 ◽  
Author(s):  
Gang Chen ◽  
Ronen Rapaport ◽  
Dan T. Fuchs ◽  
Leah Lucas ◽  
Andrew J. Lovinger ◽  
...  
Keyword(s):  
Quantum Dots ◽  
Polymer Matrix ◽  
Optical Gain ◽  
Nanocrystal Quantum Dots

Quantum efficiency of stimulated emission in colloidal semiconductor nanocrystal quantum dots

2009 ◽  
Vol 80 (3) ◽  
Author(s):  
Chunfeng Zhang ◽  
Jian Xu ◽  
Ting Zhu ◽  
Fan Zhang ◽  
Zhanao Tan ◽  
...  
Keyword(s):  
Quantum Dots ◽  
Quantum Efficiency ◽  
Stimulated Emission ◽  
Semiconductor Nanocrystal ◽  
Nanocrystal Quantum Dots ◽  
Colloidal Semiconductor

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 Signature of Generalized Gibbs Ensemble Deviation from Equilibrium: Negative Absorption Induced by a Local Quench

Entropy ◽  
2021 ◽  
Vol 23 (2) ◽  
pp. 220
Author(s):  
Lorenzo Rossi ◽  
Fabrizio Dolcini ◽  
Fabio Cavaliere ◽  
Niccolò Traverso Ziani ◽  
Maura Sassetti ◽  
...  
Keyword(s):  
Optical Gain ◽  
Electron System ◽  
Bound State ◽  
Stimulated Emission ◽  
Optical Measurements ◽  
Gibbs Ensemble ◽  
Attractive Potential ◽  
Dimensional Electron System ◽  
Constants Of Motion ◽  
Generalized Gibbs Ensemble

When a parameter quench is performed in an isolated quantum system with a complete set of constants of motion, its out of equilibrium dynamics is considered to be well captured by the Generalized Gibbs Ensemble (GGE), characterized by a set {λα} of coefficients related to the constants of motion. We determine the most elementary GGE deviation from the equilibrium distribution that leads to detectable effects. By quenching a suitable local attractive potential in a one-dimensional electron system, the resulting GGE differs from equilibrium by only one single λα, corresponding to the emergence of an only partially occupied bound state lying below a fully occupied continuum of states. The effect is shown to induce optical gain, i.e., a negative peak in the absorption spectrum, indicating the stimulated emission of radiation, enabling one to identify GGE signatures in fermionic systems through optical measurements. We discuss the implementation in realistic setups.

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