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Low-threshold two-photon pumped ZnO nanowire lasers
Chunfeng Zhang1, Fan Zhang, Tian Xia
1Department of Engineering Science and Mechanics, The Pennsylvania State University, University Park, Pennsylvania 16802, USA.
Optics Express
|May 13, 2009
Summary
We demonstrate two-photon absorption (TPA) induced room-temperature lasing in ZnO nanowires. This process achieved a low threshold, comparable to linear lasing, due to enhanced TPA coefficients in nanowires.
Area of Science:
- Materials Science
- Optoelectronics
- Nanotechnology
Background:
- ZnO nanowires exhibit unique optical properties.
- Two-photon absorption (TPA) is a nonlinear optical process.
- Room-temperature lasing in nanowires is desirable for optoelectronic devices.
Purpose of the Study:
- To investigate TPA-induced room-temperature lasing in ZnO nanowires.
- To characterize the TPA properties of ZnO nanowires.
- To understand the mechanism behind low-threshold lasing.
Main Methods:
- Femtosecond pulse-excitation at 700 nm.
- Time-resolved photoluminescence spectroscopy.
- Nonlinear transmission measurements.
Main Results:
- Observed TPA-induced room-temperature lasing with a low threshold (160 microJ/cm(2)).
- Stimulated emission decay time of 3-4 ps, compared to 50-70 ps for spontaneous emission.
- Enhanced TPA coefficient in ZnO nanowires (14.7 times larger than bulk ZnO).
Conclusions:
- TPA-induced lasing in ZnO nanowires is feasible at room temperature.
- Enhanced TPA in nanowires leads to low lasing thresholds.
- Optical field confinement within nanowire waveguides contributes to TPA enhancement.
