期刊
ACS PHOTONICS
卷 8, 期 4, 页码 1001-1006出版社
AMER CHEMICAL SOC
DOI: 10.1021/acsphotonics.0c01908
关键词
terahertz; scattering-type scanning near-field microscopy; coherent imaging; quantum cascade lasers; self-mixing
类别
资金
- EPSRC Programme Grant HyperTerahertz [EP/P021859/1]
- EPSRC fellowship [EP/P007449/1]
- UK Research and Innovation (Future Leaders Fellowship) [MR/S016929/1]
- Royal Society
- Wolfson Foundation
- EPSRC [EP/P021859/1, EP/P007449/1] Funding Source: UKRI
This study reports the use of a terahertz-frequency quantum cascade laser in all-electronic coherent scattering-type scanning near-field microscopy (s-SNOM), achieving spatial mapping of both amplitude and phase of the scattered field with deeply subwavelength resolution in a phonon-resonant crystal. The technique shows clear contrast with metallic and nonresonant dielectric materials, and paves the way for fast nanoscale-resolved mapping of the dielectric function of solid state systems and optoelectronic nanodevices at terahertz frequencies.
We report all-electronic coherent scattering-type scanning near-field microscopy (s-SNOM) using a terahertz-frequency quantum cascade laser. By exploiting the coherent self-mixing effect in these lasers, in conjunction with electronic frequency tuning of the laser, we demonstrate spatial mapping of both the amplitude and the phase of the scattered field with deeply subwavelength resolution. We apply our technique for coherent microscopy of a phonon-resonant crystal. The extracted amplitude and phase parameters reveal clear contrast when compared to both metallic and nonresonant dielectric materials and show excellent agreement with those calculated using a finite-dipole model of the near-field interaction between the s-SNOM tip and the resonant sample in the Reststrahlen band. Our technique paves the way for fast nanoscale-resolved mapping of the dielectric function of solid state systems and optoelectronic nanodevices at terahertz frequencies.
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