scholarly journals Quantifying the efficiency of förster-assisted optical gain in semiconducting polymer blends by excitation wavelength selective amplified spontaneous emission

2016 ◽  
Vol 54 (22) ◽  
pp. 2311-2317 ◽  
Author(s):  
Longfei Wu ◽  
Feng Luo ◽  
Larry Lüer ◽  
Beatriz Romero ◽  
Jose Manuel Otón ◽  
...  
Keyword(s):  
Polymer Blends ◽  
Spontaneous Emission ◽  
Optical Gain ◽  
Amplified Spontaneous Emission ◽  
Excitation Wavelength ◽  
Semiconducting Polymer

scholarly journals Amplified Spontaneous Emission and Optical Gain in Organic Single Crystal Quinquethiophene

Crystals ◽  
2019 ◽  
Vol 9 (12) ◽  
pp. 609 ◽  
Author(s):  
Muhammad Zeb ◽  
Muhammad Tahir ◽  
Fida Muhammad ◽  
Suhana Mohd Said ◽  
Mohd Faizul Mohd Sabri ◽  
...  
Keyword(s):  
Single Crystal ◽  
Spontaneous Emission ◽  
Threshold Energy ◽  
Pump Energy ◽  
Optical Gain ◽  
Amplified Spontaneous Emission ◽  
Stimulated Emission ◽  
Excitation Wavelength ◽  
Optical Amplification ◽  
Organic Single Crystal

In this paper, we report optical characteristics of an organic single crystal oligomer 5,5⁗-diphenyl-2,2′:5′,2″:5″,2‴:5‴,2⁗-quinquethiophene (P5T). P5T crystal is a thiophene/phenylene co-oligomer that possesses better charge mobility as well as photoluminescence quantum efficiency (PLQE) as compared to other organic materials. Stimulated emission in P5T is investigated via amplified spontaneous emission (ASE) measurements within broad pump energies ranging from 35.26 to 163.34 µJ/cm2. An Nd-YAG femtosecond-tunable pulsed laser is used as a pump energy source for the ASE measurements of P5T crystals at an excitation wavelength of 445 nm. The ASE spectra exhibit optical amplification in P5T crystals at a 625 nm peak wavelength with a lower threshold energy density (Eth) ≈ 52.64 μJ/cm2. P5T also demonstrates higher optical gain with a value of 72 cm−1, that is calculated by using the variable stripe-length method. The value of PLQE is measured to be 68.24% for P5T. This study proposes potential applications of P5T single crystals in organic solid state lasers, photodetectors, and optical amplifiers.

Förster transfer based amplified spontaneous emission in conjugated polymer blends

1999 ◽  
Vol 102 (1-3) ◽  
pp. 875-876 ◽  
Author(s):  
R. Gupta ◽  
M. Stevenson ◽  
M.D. McGehee ◽  
A. Dogariu ◽  
V. Srdanov ◽  
...  
Keyword(s):  
Polymer Blends ◽  
Spontaneous Emission ◽  
Conjugated Polymer ◽  
Amplified Spontaneous Emission

scholarly journals Random lasing and amplified spontaneous emission from silk inverse opals: Optical gain enhancement via protein scatterers

2019 ◽  
Vol 9 (1) ◽  
Author(s):  
Muhammad Umar ◽  
Kyungtaek Min ◽  
Sookyoung Kim ◽  
Sunghwan Kim
Keyword(s):  
Spontaneous Emission ◽  
High Surface ◽  
Optical Gain ◽  
Amplified Spontaneous Emission ◽  
Biological Tissues ◽  
Light Sources ◽  
Inverse Opal ◽  
Random Lasing ◽  
Protein Film ◽  
Gain Enhancement

Abstract Gain amplification and coherent lasing lines through random lasing (RL) can be produced by a random distribution of scatterers in a gain medium. If these amplified light sources can be seamlessly integrated into biological systems, they can have useful bio-optical applications, such as highly accurate sensing and high-resolution imaging. In this paper, a fully biocompatible light source showing RL and amplified spontaneous emission (ASE) with a reduced threshold is reported. Random cavities were induced in a biocompatible silk protein film by incorporating an inverse opal with an inherent disorder and a biocompatible dye for optical gain into the film. By choosing the appropriate air-sphere diameters, clear RL spikes in the emission spectra that were clearly distinguished from those of the ASE were observed in the silk inverse opal (SIO) with optical gain. Additionally, the RL output exhibited spatial coherence; however, the ASE did not. The high surface-to-volume ratio and amplification of the SIO led to highly efficient chemosensing in the detection of hydrogen chloride vapor. Moreover, SIO could be miniaturized to be made suitable for injection into biological tissues and obtain RL signals. Our results, which open the way for the development of a new generation of miniaturized bio-lasers, may be considered as the first example of engineered RL with biocompatible materials.

scholarly journals Synthesis, optical properties, and amplified spontaneous emission of hybrid Ag–SiO2–CdTe nanocomposite

2017 ◽  
Vol 95 (10) ◽  
pp. 933-940
Author(s):  
A.M. Saad ◽  
M.B. Mohamed ◽  
I.M. Azzouz
Keyword(s):  
Spontaneous Emission ◽  
Amplified Spontaneous Emission ◽  
Silica Shell ◽  
Thermal Therapy ◽  
Threshold Power ◽  
Excitation Wavelength ◽  
Exciton Absorption ◽  
Light Emitting ◽  
Cdte Nanoparticles ◽  
And Control

In this work, a hybrid nanocomposite of metal–dielectric–semiconductor, Ag–SiO2–CdTe, nanoparticles has been synthesized. Silica shell was used as a spacer to isolate and control the distance between Ag plasmonic and luminescent CdTe QDs. It was found that insertion of silica shell enhances the plasmonic field more than 31%. Accordingly, Ag-SiO2 plasmonic enhances the luminescence and quantum yield of CdTe quantum dots by 200% and 55%, respectively. The threshold power of amplified spontaneous emission of CdTe was found to depend on both temperature and excitation wavelength location with respect to plasmon and exciton absorption. This nanocomposite could be potentially used in light-emitting diodes, biological sensing, and thermal therapy.

scholarly journals Continuous-wave infrared optical gain and amplified spontaneous emission at ultralow threshold by colloidal HgTe quantum dots

2017 ◽  
Vol 17 (1) ◽  
pp. 35-42 ◽  
Author(s):  
Pieter Geiregat ◽  
Arjan J. Houtepen ◽  
Laxmi Kishore Sagar ◽  
Ivan Infante ◽  
Felipe Zapata ◽  
...  
Keyword(s):  
Quantum Dots ◽  
Spontaneous Emission ◽  
Continuous Wave ◽  
Optical Gain ◽  
Amplified Spontaneous Emission

Amplified spontaneous emission and optical gain spectra from stilbenoid and phenylene vinylene derivative model compounds

1999 ◽  
Vol 86 (11) ◽  
pp. 6155-6159 ◽  
Author(s):  
Kevin P. Kretsch ◽  
Colin Belton ◽  
Stephen Lipson ◽  
Werner J. Blau ◽  
Fryad Z. Henari ◽  
...  
Keyword(s):  
Spontaneous Emission ◽  
Optical Gain ◽  
Amplified Spontaneous Emission ◽  
Phenylene Vinylene ◽  
Model Compounds ◽  
Gain Spectra
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