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Continuous alloy-composition spatial grading and superbroad wavelength-tunable nanowire lasers on a single chip
Anlian Pan1, Weichang Zhou, Eunice S P Leong
1Department of Electrical Engineering, Arizona Institute of NanoElectronics, Arizona State University, Tempe, Arizona 85287, USA.
Nano Letters
|January 29, 2009
Summary
We developed a new method to create tunable semiconductor lasers using cadmium sulfide selenide (CdSSe) nanowires. This technology offers a broad wavelength tuning range, surpassing existing semiconductor laser options.
Area of Science:
- Materials Science
- Nanotechnology
- Optoelectronics
Background:
- Semiconductor nanowires offer unique optical properties.
- Ternary alloys allow for tunable bandgaps.
- Achieving uniform composition grading in nanowires is challenging.
Purpose of the Study:
- To demonstrate spatial composition grading in cadmium sulfide selenide (CdSSe) nanowires.
- To create a continuously tunable laser source.
- To explore the lasing properties of graded CdSSe nanowires.
Main Methods:
- Utilizing chemical vapor deposition (CVD) with controlled local substrate temperature.
- Fabricating CdSSe nanowires with a complete composition range on a single substrate.
- Performing spatial photoluminescence (PL) scans to analyze composition and optical properties.
- Conducting optical pumping experiments to induce and observe lasing behavior.
Main Results:
- Successfully achieved spatial composition grading of CdSSe nanowires across the entire composition range on a 1.2 cm substrate.
- Observed a continuous shift in photoluminescence peak wavelength from approximately 500 nm to 700 nm along the substrate.
- Demonstrated lasing behavior at every spot along the substrate under strong optical pumping.
Conclusions:
- The developed nanowire chip provides a spatially continuously tunable laser.
- This technology offers an unprecedentedly broad wavelength tuning range for semiconductor lasers.
- The findings present a novel approach for advanced optoelectronic device fabrication.
