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Your search keyword '"Lan Fu"' showing total 14 results
Start Over Author "Lan Fu" Publisher american chemical society
14 results on '"Lan Fu"'

2. Large-scale statistics for threshold optimization of optically pumped nanowire lasers

Author

Kun Peng, Sudha Mokkapati, Lan Fu, Dhruv Saxena, Xiaoyan Tang, Chennupati Jagadish, Juan Arturo Alanis, Nian Jiang, Patrick Parkinson, and Hark Hoe Tan

Subjects
Photoluminescence, Materials science, Nanowire, Physics::Optics, Bioengineering, 02 engineering and technology, Substrate (electronics), 01 natural sciences, law.invention, Optics, law, 0103 physical sciences, General Materials Science, QC, QB, 010302 applied physics, business.industry, Mechanical Engineering, General Chemistry, 021001 nanoscience & nanotechnology, Condensed Matter Physics, Laser, Characterization (materials science), Gain-switching, Core (optical fiber), Optoelectronics, 0210 nano-technology, business, Lasing threshold
Abstract

Single nanowire lasers based on bottom-up III-V materials have been shown to exhibit room-temperature near-infrared lasing, making them highly promising for use as nanoscale, silicon-integrable and coherent light sources. While lasing behavior is reproducible, small variations in growth conditions across a substrate arising from the use of bottom-up growth techniques can introduce inter-wire disorder, either through geometric or material inhomogeneity. Nanolasers critically depend on both high material quality and tight dimensional tolerances, and as such, lasing threshold is both sensitive to, and a sensitive probe of such inhomogeneity. We present an all-optical characterization technique coupled to statistical analysis to correlate geometrical, and material parameters with lasing threshold. For these multiple-quantum-well nanolasers, it is found that low threshold is closely linked to longer lasing wavelength caused by losses in the core, providing a route to optimized future low-threshold devices. A best-in-group room temperature lasing threshold of 43 uJcm-2 under pulsed excitation was found, and overall device yields in excess of 50% are measured, demonstrating a promising future for the nanolaser architecture.

Published
2017

13. Water Droplet Motion Control on Superhydrophobic Surfaces: Exploiting the Wenzel-to-Cassie Transition.

Author

Guangming Liu, Lan Fu, Andrei V. Rode, and Vincent S. J. Craig

Subjects
*MOTION control devices, *HYDROPHOBIC surfaces, *TRANSITION metals, *LASERS, *TRAPPING, *SURFACE chemistry
Abstract

Water droplets on rough hydrophobic surfaces are known to exist in two states; one in which the droplet is impaled on the surface asperities (Wenzel state) and the other, a superhydrophobic state in which air remains trapped beneath the droplet (Cassie state). Here, we demonstrate that water droplets can transit from the Wenzel-to-Cassie state even though the former is energetically favored. We find that two distinct superhydrophobic states are produced. One is a true Cassie state, whereas the other exhibits superhydrophobicity in the absence of a vapor phase being trapped in the surface roughness. Furthermore, we can selectively drive the motion of water droplets on tilted structured hydrophobic surfaces by exploiting Wenzel-to-Cassie transitions. This can be achieved by heating the substrate or by directly heating the droplet using a laser. [ABSTRACT FROM AUTHOR]

Published
2011
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