期刊
APPLIED PHYSICS LETTERS
卷 103, 期 21, 页码 -出版社
AIP Publishing
DOI: 10.1063/1.4832859
关键词
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资金
- EPSRC [EP/G031819/1]
- Imperial College Junior Research Fellowship
- EPSRC [EP/G031819/1, EP/D063329/1, EP/H000917/2] Funding Source: UKRI
- Engineering and Physical Sciences Research Council [GR/S80301/01, 1374319, EP/H000917/2, EP/G031819/1, EP/D063329/1] Funding Source: researchfish
We demonstrate the use of a pulsed quantum cascade laser, wavelength tuneable between 6 and 10 mu m, with a scattering-type scanning near-field optical microscope (s-SNOM). A simple method for calculating the signal-to-noise ratio (SNR) of the s-SNOM measurement is presented. For pulsed lasers, the SNR is shown to be highly dependent on the degree of synchronization between the laser pulse and the sampling circuitry; in measurements on a gold sample, the SNR is 26 with good synchronization and less than 1 without. Simulations and experimental s-SNOM images, with a resolution of 100 nm, corresponding to lambda/80, and an acquisition time of less than 90 s, are presented as proof of concept. They show the change in the field profile of plasmon-resonant broadband antennas when they are excited with wavelengths of 7.9 and 9.5 mu m. (C) 2013 AIP Publishing LLC.
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