Details

Autor(en) / Beteiligte

• Giordano, Maria C
• Mastel, Stefan
• Liewald, Clemens
• Columbo, Lorenzo L
• Brambilla, Massimo
• Viti, Leonardo
• Politano, Antonio
• Zhang, Kai
• Li, Lianhe
• Davies, A Giles
• Linfield, Edmund H
• Hillenbrand, Rainer
• Keilmann, Fritz
• Scamarcio, Gaetano
• Vitiello, Miriam S

Titel

Phase-resolved terahertz self-detection near-field microscopy

Ist Teil von

• Optics express, 2018-07, Vol.26 (14), p.18423-18435

Ort / Verlag

United States

Erscheinungsjahr

2018

Quelle

EZB Electronic Journals Library

Beschreibungen/Notizen

• At terahertz (THz) frequencies, scattering-type scanning near-field optical microscopy (s-SNOM) based on continuous wave sources mostly relies on cryogenic and bulky detectors, which represents a major constraint for its practical application. Here, we devise a THz s-SNOM system that provides both amplitude and phase contrast and achieves nanoscale (60-70nm) in-plane spatial resolution. It features a quantum cascade laser that simultaneously emits THz frequency light and senses the backscattered optical field through a voltage modulation induced inherently through the self-mixing technique. We demonstrate its performance by probing a phonon-polariton-resonant CsBr crystal and doped black phosphorus flakes.