Low Threshold Room Temperature Amplified Spontaneous Emission in 0D, 1D and 2D Quantum Confined Systems

Abstract We address optical amplification properties of quantum nanoparticles of the cadmium selenide/cadmium sulfide (CdSe/CdS) material system with different dimensionality of spatial confinement. CdSe/CdS core/shell quantum dots (QDs), core/shell quantum rods (QRs) and 5 monolayer thick core/crow...

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Autores principales:	Parva Chhantyal, Suraj Naskar, Tobias Birr, Tim Fischer, Franziska Lübkemann, Boris N. Chichkov, Dirk Dorfs, Nadja C. Bigall, Carsten Reinhardt
Formato:	article
Lenguaje:	EN
Publicado:	Nature Portfolio 2018
Materias:	Medicine R Science Q
Acceso en línea:	https://doaj.org/article/74fc7472a2af43f8a4d21f2e670ac581
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spelling	oai:doaj.org-article:74fc7472a2af43f8a4d21f2e670ac5812021-12-02T15:09:08ZLow Threshold Room Temperature Amplified Spontaneous Emission in 0D, 1D and 2D Quantum Confined Systems10.1038/s41598-018-22287-92045-2322https://doaj.org/article/74fc7472a2af43f8a4d21f2e670ac5812018-03-01T00:00:00Zhttps://doi.org/10.1038/s41598-018-22287-9https://doaj.org/toc/2045-2322Abstract We address optical amplification properties of quantum nanoparticles of the cadmium selenide/cadmium sulfide (CdSe/CdS) material system with different dimensionality of spatial confinement. CdSe/CdS core/shell quantum dots (QDs), core/shell quantum rods (QRs) and 5 monolayer thick core/crown nanoplatelets (NPLs) at ambient temperature are considered, exhibiting 0D, 1D and 2D spatial confinement dimensionality of the electronic system, respectively. Continuous films of all these nanoparticles are synthesised, and amplified spontaneous emission (ASE) spectra are measured under femtosecond pumping at wavelengths of 400 nm and 800 nm, respectively. The lowest threshold is found for NPLs and the highest for QDs, demonstrating the influence of the rod-like and plate-like CdS structures. To emphasize this effect, ASE is demonstrated also in CdSe/CdS QRs and NPLs under nanosecond pumping at 355 nm in the same material films. The amplification has been achieved without use of any feedback structure, emphazising the efficiency of the antenna effect. The pumping threshold fluences for NPLs and QRs are observed to be similar, but no ASE is observed in QDs up to the damage threshold of the nanoparticle layers. The length variation investigation with nanosecond pumping resulted in the gain coefficients of 29 cm −1 and 37 cm −1 for QRs and NPLs, respectively.Parva ChhantyalSuraj NaskarTobias BirrTim FischerFranziska LübkemannBoris N. ChichkovDirk DorfsNadja C. BigallCarsten ReinhardtNature PortfolioarticleMedicineRScienceQENScientific Reports, Vol 8, Iss 1, Pp 1-9 (2018)
institution	DOAJ
collection	DOAJ
language	EN
topic	Medicine R Science Q
spellingShingle	Medicine R Science Q Parva Chhantyal Suraj Naskar Tobias Birr Tim Fischer Franziska Lübkemann Boris N. Chichkov Dirk Dorfs Nadja C. Bigall Carsten Reinhardt Low Threshold Room Temperature Amplified Spontaneous Emission in 0D, 1D and 2D Quantum Confined Systems
description	Abstract We address optical amplification properties of quantum nanoparticles of the cadmium selenide/cadmium sulfide (CdSe/CdS) material system with different dimensionality of spatial confinement. CdSe/CdS core/shell quantum dots (QDs), core/shell quantum rods (QRs) and 5 monolayer thick core/crown nanoplatelets (NPLs) at ambient temperature are considered, exhibiting 0D, 1D and 2D spatial confinement dimensionality of the electronic system, respectively. Continuous films of all these nanoparticles are synthesised, and amplified spontaneous emission (ASE) spectra are measured under femtosecond pumping at wavelengths of 400 nm and 800 nm, respectively. The lowest threshold is found for NPLs and the highest for QDs, demonstrating the influence of the rod-like and plate-like CdS structures. To emphasize this effect, ASE is demonstrated also in CdSe/CdS QRs and NPLs under nanosecond pumping at 355 nm in the same material films. The amplification has been achieved without use of any feedback structure, emphazising the efficiency of the antenna effect. The pumping threshold fluences for NPLs and QRs are observed to be similar, but no ASE is observed in QDs up to the damage threshold of the nanoparticle layers. The length variation investigation with nanosecond pumping resulted in the gain coefficients of 29 cm −1 and 37 cm −1 for QRs and NPLs, respectively.
format	article
author	Parva Chhantyal Suraj Naskar Tobias Birr Tim Fischer Franziska Lübkemann Boris N. Chichkov Dirk Dorfs Nadja C. Bigall Carsten Reinhardt
author_facet	Parva Chhantyal Suraj Naskar Tobias Birr Tim Fischer Franziska Lübkemann Boris N. Chichkov Dirk Dorfs Nadja C. Bigall Carsten Reinhardt
author_sort	Parva Chhantyal
title	Low Threshold Room Temperature Amplified Spontaneous Emission in 0D, 1D and 2D Quantum Confined Systems
title_short	Low Threshold Room Temperature Amplified Spontaneous Emission in 0D, 1D and 2D Quantum Confined Systems
title_full	Low Threshold Room Temperature Amplified Spontaneous Emission in 0D, 1D and 2D Quantum Confined Systems
title_fullStr	Low Threshold Room Temperature Amplified Spontaneous Emission in 0D, 1D and 2D Quantum Confined Systems
title_full_unstemmed	Low Threshold Room Temperature Amplified Spontaneous Emission in 0D, 1D and 2D Quantum Confined Systems
title_sort	low threshold room temperature amplified spontaneous emission in 0d, 1d and 2d quantum confined systems
publisher	Nature Portfolio
publishDate	2018
url	https://doaj.org/article/74fc7472a2af43f8a4d21f2e670ac581
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Low Threshold Room Temperature Amplified Spontaneous Emission in 0D, 1D and 2D Quantum Confined Systems

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