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Broadband Frequency-Tunable Whispering-Gallery-Mode Superradiant Light from Quantum Dots in Colloidal Solution
Joint Authors
AlSalhi, M. S.
Prasad, Saradh
Aljaafreh, Mamduh J.
Othman, Ahmad H. S.
Source
Issue
Vol. 2018, Issue 2018 (31 Dec. 2018), pp.1-9, 9 p.
Publisher
Hindawi Publishing Corporation
Publication Date
2018-06-05
Country of Publication
Egypt
No. of Pages
9
Main Subjects
Abstract EN
We examine superradiant (SR) light or amplified spontaneous emission (ASE) from a whispering-gallery-mode (WGM) laser comprising various sized (CdSe) ZnS quantum dots (QDs) in colloidal liquid.
Laser-induced fluorescence (LIF) with a full width at half maximum (FWHM) of 40 nm is observed when the colloidal QD system is pumped with 2 mJ of laser light at 355 nm (3rd harmonic of Nd:YAG laser).
Under optimal conditions of pump energy and focusing, ASE at 520 nm with a bandwidth of Δλ=8 nm (FWHM) and divergence of 9 mrad is observed.
When the QDs are embedded on a high-Q factor silica microsphere ((functionalized with an amine), SMA), they generate WGMs with random peak distributions.
Finally, when all the QDs embedded in SMAs are mixed and placed in a cuvette, we obtain a “WGM laser” that is almost continuously tunable from 520 nm to 630 nm with a spectral width less than 2 nm (FWHM) in the WGM and less than 1.2 nm in the cavity mode.
We believe that this is the first report on a frequency tunable laser obtained using (CdSe) ZnS QDs embedded in an SMA, exhibiting an efficiency of 0.06%.
American Psychological Association (APA)
AlSalhi, M. S.& Prasad, Saradh& Aljaafreh, Mamduh J.& Othman, Ahmad H. S.. 2018. Broadband Frequency-Tunable Whispering-Gallery-Mode Superradiant Light from Quantum Dots in Colloidal Solution. Journal of Nanomaterials،Vol. 2018, no. 2018, pp.1-9.
https://search.emarefa.net/detail/BIM-1194072
Modern Language Association (MLA)
AlSalhi, M. S.…[et al.]. Broadband Frequency-Tunable Whispering-Gallery-Mode Superradiant Light from Quantum Dots in Colloidal Solution. Journal of Nanomaterials No. 2018 (2018), pp.1-9.
https://search.emarefa.net/detail/BIM-1194072
American Medical Association (AMA)
AlSalhi, M. S.& Prasad, Saradh& Aljaafreh, Mamduh J.& Othman, Ahmad H. S.. Broadband Frequency-Tunable Whispering-Gallery-Mode Superradiant Light from Quantum Dots in Colloidal Solution. Journal of Nanomaterials. 2018. Vol. 2018, no. 2018, pp.1-9.
https://search.emarefa.net/detail/BIM-1194072
Data Type
Journal Articles
Language
English
Notes
Includes bibliographical references
Record ID
BIM-1194072