CUED Publications database

Broadly defining lasing wavelengths in single bandgap-graded semiconductor nanowires

Yang, Z and Wang, D and Meng, C and Wu, Z and Wang, Y and Ma, Y and Dai, L and Liu, X and Hasan, T and Liu, X and Yang, Q (2014) Broadly defining lasing wavelengths in single bandgap-graded semiconductor nanowires. Nano Letters, 14. pp. 3153-3159. ISSN 1530-6984

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Designing lasing wavelengths and modes is essential to the practical applications of nanowire (NW) lasers. Here, according to the localized photoluminescence spectra, we first demonstrate the ability to define lasing wavelengths over a wide range (up to 119 nm) based on an individual bandgap-graded CdSSe NW by forward cutting the NW from CdSe to CdS end. Furthermore, free spectral range (FSR) and modes of the obtained lasers could be controlled by backward cutting the NW from CdS to CdSe end step-by-step. Interestingly, single-mode NW laser with predefined lasing wavelength is realized in short NWs because of the strong mode competition and increase in FSR. Finally, the gain properties of the bandgap-graded NWs are investigated. The combination of wavelength and mode selectivity in NW lasers may provide a new platform for the next generation of integrated optoelectronic devices. © 2014 American Chemical Society.

Item Type: Article
Divisions: Div B > Solid State Electronics and Nanoscale Science
Depositing User: Cron Job
Date Deposited: 17 Jul 2017 18:57
Last Modified: 02 Mar 2021 09:10
DOI: 10.1021/nl500432m