期刊
NANO LETTERS
卷 14, 期 6, 页码 3153-3159出版社
AMER CHEMICAL SOC
DOI: 10.1021/nl500432m
关键词
Cadmium Sulfide Selenide; Bandgap-Graded Nanowire; Lasing; Defining Wavelength; Mode Selectivity
类别
资金
- National Key Basic Research Program of China [2013CB328703]
- National Natural Science Foundation of China [51372220, 61177062, 61125402, 51172004]
- Program for Zhejiang Leading Team of ST Innovation
- Fundamental Research Funds for the Central Universities
- Royal Academy of Engineering (Graphlex)
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.
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