Optical Gain Coefficient Measurement Of Colloidal Solution Of Spasers

2015 ◽  
Vol 10 (2) ◽  
pp. 5-9
Author(s):  
Fedor Benimetskiy ◽  
Aleksandr Plekhanov
Keyword(s):  
Colloidal Solution ◽  
Optical Gain ◽  
Gain Coefficient ◽  
Stimulated Emission ◽  
Shell Nanoparticles ◽  
Gold Core ◽  
Sample Edge ◽  
Fluorescein Solution ◽  
Coefficient Measurement ◽  
Stripe Length

Optical gain coefficient of colloidal solution of spasers was measured by the variable stripe length method, where the intensity of the amplified spontaneous emission from the sample edge is measured as a function of excited volume. Spasers consist of gold core-silica (porous) shell nanoparticles penetrated with fluorescein. Under these conditions, we observed the exponential growth and narrowing of line and directivity of stimulated emission. The obtained optical gain coefficient of spaser colloids in fluorescein solution in ethanol is g = 16,2 cm–1. Separately, fluorescein solution in ethanol had g = 3,7 cm–1.

Stimulated Emission at 258 nm in AlN/AlGaN Quantum Wells Grown on Bulk AlN Substrates

2003 ◽  
Vol 764 ◽  
Author(s):  
R. Gaska ◽  
Q. Fareed ◽  
G. Tamulaitis ◽  
I. Yilmaz ◽  
M.S. Shur ◽  
...  
Keyword(s):  
Quantum Wells ◽  
Emission Intensity ◽  
Chemical Vapour ◽  
Pump Intensity ◽  
Stimulated Emission ◽  
Structural Quality ◽  
Multiple Quantum ◽  
Sample Edge ◽  
Intensity Saturation ◽  
Stripe Length

AbstractWe report on observation of stimulated emission at 258 nm in AlN/AlGaN multiple quantum wells. The structures were grown over Al-face single crystal bulk AlN substrates. AlN/AlGaN structures with 50% of Al in the well material were grown using low-pressure metalorganic chemical vapour deposition. Characterization by using X-ray, AFM, SEM, and photoluminescence techniques indicated high structural quality of the structures. The stimulated emission was measured using the variable stripe length method under excitation by 4-ns-long pulses of the fifth harmonic of Nd:YAG laser radiation at 213 nm (5.82 eV). The stimulated emission exhibited a characteristic superlinear dependence of emission intensity on the pump intensity as well as an exponential increase of the sample-edge emission intensity with increasing stripe length up to ∼430 μm and the intensity saturation beyond this range. The observation of stimulated emission at 258 nm is very promising for the future development of III-nitride-based deep-UV laser diodes on bulk AlN substrates.

scholarly journals Optical Gain of Lead Halide Perovskites Measured via the Variable Stripe Length Method: What We Can Learn and How to Avoid Pitfalls

2021 ◽  
pp. 2001773
Author(s):  
Ada Lili Alvarado‐Leaños ◽  
Daniele Cortecchia ◽  
Giulia Folpini ◽  
Ajay Ram Srimath Kandada ◽  
Annamaria Petrozza
Keyword(s):  
Optical Gain ◽  
Halide Perovskites ◽  
Lead Halide ◽  
Stripe Length

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

Iron Oxide-Gold Core-Shell Nanoparticles as Multimodal Imaging Contrast Agent

2013 ◽  
Vol 13 (6) ◽  
pp. 2341-2347 ◽  
Author(s):  
Luca Menichetti ◽  
Leonardo Manzoni ◽  
Luigi Paduano ◽  
A. Flori ◽  
Claudia Kusmic ◽  
...  
Keyword(s):  
Iron Oxide ◽  
Contrast Agent ◽  
Multimodal Imaging ◽  
Core Shell ◽  
Shell Nanoparticles ◽  
Gold Core ◽  
Core Shell Nanoparticles ◽  
Imaging Contrast Agent

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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