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- W4221129610 abstract "Scattering-type scanning near-field optical microscopy enables the measurement of optical constants of a surface beyond the diffraction limit. Its compatibility with pulsed sources is hampered by the requirement of a high-repetition rate imposed by lock-in detection. We describe a sampling method, called quadrature-assisted discrete (quad) demodulation, which circumvents this constraint. Quad demodulation operates by measuring the optical signal and the modulation phases for each individual light pulse. This method retrieves the near-field signal in the pseudoheterodyne mode, as proven by retraction curves and near-field images. Measurement of the near-field using a pulsed femtosecond amplifier and quad demodulation is in agreement with results obtained using a CW laser and the standard lock-in detection method." @default.
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- W4221129610 date "2022-03-28" @default.
- W4221129610 modified "2023-09-25" @default.
- W4221129610 title "Pseudoheterodyne near-field imaging at kHz repetition rates via quadrature-assisted discrete demodulation" @default.
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- W4221129610 doi "https://doi.org/10.1063/5.0087187" @default.
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