Pseudoheterodyne detection for background-free near-field spectroscopy
2006; American Institute of Physics; Volume: 89; Issue: 10 Linguagem: Inglês
10.1063/1.2348781
ISSN1520-8842
AutoresN. Ocelic, Andreas Huber, Rainer Hillenbrand,
Tópico(s)Plasmonic and Surface Plasmon Research
ResumoThe authors present a detection technique for scattering-type near-field optical microscopy capable of background interference elimination in the entire near-UV to far-IR spectral range. It simultaneously measures near-field optical signal amplitude and phase by interferometric detection of scattered light utilizing a phase-modulated reference wave. They compare its background suppression efficiency to other known methods and experimentally show that it provides a reliable near-field optical material contrast even in the case where both noninterferometric and homodyne interferometric detection methods fail.
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