Details
| Original language | English |
|---|---|
| Article number | 3962 |
| Journal | Scientific reports |
| Volume | 8 |
| Early online date | 2 Mar 2018 |
| Publication status | E-pub ahead of print - 2 Mar 2018 |
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.
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In: Scientific reports, Vol. 8, 3962, 02.03.2018.
Research output: Contribution to journal › Article › Research › peer review
}
TY - JOUR
T1 - Low Threshold Room Temperature Amplifed Spontaneous Emission in 0D, 1D and 2D Quantum Confned Systems
AU - Chhantyal, Parva
AU - Naskar, Suraj
AU - Birr, Tobias
AU - Fischer, Tim
AU - Lübkemann, Franziska
AU - Chichkov, Boris N.
AU - Dorfs, Dirk
AU - Bigall, Nadja C.
AU - Reinhardt, Carsten
N1 - Funding information: The authors acknowledge Heinrich Mädebach from Laser Coating department in Laser Zentrum Hannover for his assistance. The authors further acknowledge financial support of this work from Hannover School for Nanotechnology (HSN) and the Deutsche Forschungsgemeinschaft (DFG, SPP1391: “Ultrafast Nanooptics” and SFB/TRR123: “Planar Optronic Systems”) for the financial support. S.N. and N.C.B. acknowledge funding from German Federal Ministry of Education and Research (BMBF) within the framework of NanoMatFutur (support code 03x5525). The project leading to these results has in part received funding from the European Research Council (ERC) under the European Union’s Horizon 2020 research and innovation programme (grant agreement No. 714429). D.D. acknowledges funding by the Deutsche Forschungsgemeinschaft (DFG research grant DO 1580/5-1).
PY - 2018/3/2
Y1 - 2018/3/2
N2 - 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.
AB - 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.
UR - http://www.scopus.com/inward/record.url?scp=85042780808&partnerID=8YFLogxK
U2 - 10.1038/s41598-018-22287-9
DO - 10.1038/s41598-018-22287-9
M3 - Article
C2 - 29500408
AN - SCOPUS:85042780808
VL - 8
JO - Scientific reports
JF - Scientific reports
SN - 2045-2322
M1 - 3962
ER -