Giant modal gain coefficients in colloidal II–VI nanoplatelets

Date
2019
Advisor
Instructor
Source Title
Nano Letters
Print ISSN
1530-6984
Electronic ISSN
Publisher
American Chemical Society
Volume
19
Issue
1
Pages
277 - 282
Language
English
Type
Article
Journal Title
Journal ISSN
Volume Title
Abstract

Modal gain coefficient is a key figure of merit for a laser material. Previously, net modal gain coefficients larger than a few thousand cm–1 were achieved in II–VI and III–V semiconductor gain media, but this required operation at cryogenic temperatures. In this work, using pump-fluence-dependent variable-stripe-length measurements, we show that colloidal CdSe nanoplatelets enable giant modal gain coefficients at room temperature up to 6600 cm–1 under pulsed optical excitation. Furthermore, we show that exceptional gain performance is common to the family of CdSe nanoplatelets, as shown by examining samples having different vertical thicknesses and lateral areas. Overall, colloidal II–VI nanoplatelets with superior optical gain properties are promising for a broad range of applications, including high-speed light amplification and loss compensation in plasmonic photonic circuits.

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Book Title
Keywords
Colloidal nanoplatelets, Colloidal quantum wells, CdSe, Modal gain coefficient, Variable stripe length method, Optical gain
Citation
Published Version (Please cite this version)