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• W1974575679 abstract "We report on a systematic study of highly enhanced optical field and its induced thermal transport in nanotips under laser irradiation. The effects on electric field distribution caused by curvature radius, tip aspect ratio, and polarization angle of the incident laser are studied. Our Poynting vectors' study clearly shows that when a laser interacts with a metal tip, it is bent around the tip and concentrated under the apex, where extremely high field enhancement appears. This phenomenon is more like a liquid flow being forced/squeezed to go through a narrow channel. As the tip-substrate distance increases, the peak field enhancement decreases exponentially. A shift of field peak position away from the tip axis is observed. For the incident light, only its component along the tip axis direction has a contribution to the electric field enhancement under the tip apex. The optimum tip apex radius for field enhancement is about 9 nm when the half taper angle is 10°. For a tip with a fixed radius of 30 nm, field enhancement increases with the half taper angle when it is less than 25°. The thermal transport inside the nanoscale tungsten tips due to absorption of incident laser light is explored using the finite element method. A small fraction of light penetrates into the tip. As the polarization angle or apex radius increases, the peak apex temperature decreases. The peak apex temperature goes down as the half taper angle increases, even though the mean laser intensity inside the tip increases, revealing a very strong effect of the taper angle on thermal transport." @default.
• W1974575679 created "2016-06-24" @default.
• W1974575679 creator A5005801799 @default.
• W1974575679 creator A5079725144 @default.
• W1974575679 date "2011-01-14" @default.
• W1974575679 modified "2023-10-12" @default.
• W1974575679 title "Near-field thermal transport in a nanotip under laser irradiation" @default.
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• W1974575679 doi "https://doi.org/10.1088/0957-4484/22/7/075204" @default.
• W1974575679 hasPubMedId "https://pubmed.ncbi.nlm.nih.gov/21233541" @default.
• W1974575679 hasPublicationYear "2011" @default.
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