Ultralow-threshold two-photon pumped amplified spontaneous emission and lasing from seeded CdSe/CdS nanorod heterostructures

Ultralow threshold two-photon pumped amplified spontaneous emission (2ASE) and lasing in seeded CdSe/CdS nanodot/nanorod heterostructures is demonstrated for the first time. Such heterostructures allow the independent tunability of the two-photon absorption (2PA) cross-section (σ2) through varying t...

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Main Authors: Xing, Guichuan, Liao, Yile, Wu, Xiangyang, Chakrabortty, Sabyasachi, Liu, Xinfeng, Yeow, Edwin Kok Lee, Sum, Tze Chien, Chan, Yinthai
Other Authors: School of Physical and Mathematical Sciences
Format: Article
Language:English
Published: 2013
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Online Access:https://hdl.handle.net/10356/95297
http://hdl.handle.net/10220/8936
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Institution: Nanyang Technological University
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spelling sg-ntu-dr.10356-952972023-02-28T19:22:35Z Ultralow-threshold two-photon pumped amplified spontaneous emission and lasing from seeded CdSe/CdS nanorod heterostructures Xing, Guichuan Liao, Yile Wu, Xiangyang Chakrabortty, Sabyasachi Liu, Xinfeng Yeow, Edwin Kok Lee Sum, Tze Chien Chan, Yinthai School of Physical and Mathematical Sciences DRNTU::Science::Mathematics::Discrete mathematics::Theory of computation Ultralow threshold two-photon pumped amplified spontaneous emission (2ASE) and lasing in seeded CdSe/CdS nanodot/nanorod heterostructures is demonstrated for the first time. Such heterostructures allow the independent tunability of the two-photon absorption (2PA) cross-section (σ2) through varying the CdS rod size, and that of the emission wavelength through varying the CdSe dot size. With an enhanced σ2, 2ASE in these heterostructures is achieved with an ultralow threshold fluence of ~1.5 mJ/cm2 – which is as much as one order less than that required for spherical semiconductor NCs. Importantly, by exploiting this unique property of the seeded nanorods exhibiting strong quantum confinement even at relatively large rod sizes, a near reciprocal relation between the 2ASE threshold and the 2PA action cross-section (σ2η) (where η is the quantum yield) was found and validated over a wide volume range for II-VI semiconductor nanostructures. Ultrafast optical spectroscopy verified that while the Auger processes in these heterostructures are indeed suppressed, ASE in these samples could also be strongly affected by a fast hole trapping process to the NR surface states. Lastly, to exemplify the potential of these seeded CdSe/CdS nanodot/nanorod heterostructures as a viable gain media for achieving two-photon lasing, a highly photostable microsphere laser with an ultralow pump threshold is showcased. Accepted version 2013-01-07T06:32:43Z 2019-12-06T19:12:04Z 2013-01-07T06:32:43Z 2019-12-06T19:12:04Z 2012 2012 Journal Article Xing, G., Liao , Y., Wu , X., Chakrabortty, S., Liu, X., Yeow, E. K. L., et al. (2012). Ultralow-threshold two-photon pumped amplified spontaneous emission and lasing from seeded CdSe/CdS nanorod heterostructures. ACS Nano, 6 (12), 10835–10844. https://hdl.handle.net/10356/95297 http://hdl.handle.net/10220/8936 10.1021/nn304200a 167995 en ACS nano © 2012 American Chemical Society. This is the author created version of a work that has been peer reviewed and accepted for publication by ACS Nano, American Chemical Society. It incorporates referee’s comments but changes resulting from the publishing process, such as copyediting, structural formatting, may not be reflected in this document. The published version is available at: [DOI: http://dx.doi.org/10.1021/nn304200a]. application/pdf
institution Nanyang Technological University
building NTU Library
continent Asia
country Singapore
Singapore
content_provider NTU Library
collection DR-NTU
language English
topic DRNTU::Science::Mathematics::Discrete mathematics::Theory of computation
spellingShingle DRNTU::Science::Mathematics::Discrete mathematics::Theory of computation
Xing, Guichuan
Liao, Yile
Wu, Xiangyang
Chakrabortty, Sabyasachi
Liu, Xinfeng
Yeow, Edwin Kok Lee
Sum, Tze Chien
Chan, Yinthai
Ultralow-threshold two-photon pumped amplified spontaneous emission and lasing from seeded CdSe/CdS nanorod heterostructures
description Ultralow threshold two-photon pumped amplified spontaneous emission (2ASE) and lasing in seeded CdSe/CdS nanodot/nanorod heterostructures is demonstrated for the first time. Such heterostructures allow the independent tunability of the two-photon absorption (2PA) cross-section (σ2) through varying the CdS rod size, and that of the emission wavelength through varying the CdSe dot size. With an enhanced σ2, 2ASE in these heterostructures is achieved with an ultralow threshold fluence of ~1.5 mJ/cm2 – which is as much as one order less than that required for spherical semiconductor NCs. Importantly, by exploiting this unique property of the seeded nanorods exhibiting strong quantum confinement even at relatively large rod sizes, a near reciprocal relation between the 2ASE threshold and the 2PA action cross-section (σ2η) (where η is the quantum yield) was found and validated over a wide volume range for II-VI semiconductor nanostructures. Ultrafast optical spectroscopy verified that while the Auger processes in these heterostructures are indeed suppressed, ASE in these samples could also be strongly affected by a fast hole trapping process to the NR surface states. Lastly, to exemplify the potential of these seeded CdSe/CdS nanodot/nanorod heterostructures as a viable gain media for achieving two-photon lasing, a highly photostable microsphere laser with an ultralow pump threshold is showcased.
author2 School of Physical and Mathematical Sciences
author_facet School of Physical and Mathematical Sciences
Xing, Guichuan
Liao, Yile
Wu, Xiangyang
Chakrabortty, Sabyasachi
Liu, Xinfeng
Yeow, Edwin Kok Lee
Sum, Tze Chien
Chan, Yinthai
format Article
author Xing, Guichuan
Liao, Yile
Wu, Xiangyang
Chakrabortty, Sabyasachi
Liu, Xinfeng
Yeow, Edwin Kok Lee
Sum, Tze Chien
Chan, Yinthai
author_sort Xing, Guichuan
title Ultralow-threshold two-photon pumped amplified spontaneous emission and lasing from seeded CdSe/CdS nanorod heterostructures
title_short Ultralow-threshold two-photon pumped amplified spontaneous emission and lasing from seeded CdSe/CdS nanorod heterostructures
title_full Ultralow-threshold two-photon pumped amplified spontaneous emission and lasing from seeded CdSe/CdS nanorod heterostructures
title_fullStr Ultralow-threshold two-photon pumped amplified spontaneous emission and lasing from seeded CdSe/CdS nanorod heterostructures
title_full_unstemmed Ultralow-threshold two-photon pumped amplified spontaneous emission and lasing from seeded CdSe/CdS nanorod heterostructures
title_sort ultralow-threshold two-photon pumped amplified spontaneous emission and lasing from seeded cdse/cds nanorod heterostructures
publishDate 2013
url https://hdl.handle.net/10356/95297
http://hdl.handle.net/10220/8936
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