Spectroscopic THz near-field microscope

Spectroscopic THz near-field microscope.

We demonstrate a scattering-type scanning near-field optical microscope (s-SNOM) with broadband THz illumination. A cantilevered W tip is used in tapping AFM mode. The direct scattering spectrum is obtained and optimized by asynchronous optical sampling (ASOPS), while near-field scattering is observed by using a space-domain delay stage and harmonic demodulation of the detector signal. True nea...

Scanning Near-field Raman Spectroscopic Microscope

Apertureless near-field optical microscope

We demonstrate a new method whereby near-field optical microscope resolution can be extended to the nanometer regime. The technique is based on measuring the modulation of the scattered electric field from the end of a sharp silicon tip as it is stabilized and scanned in close proximity to a sample surface. Our initial results demonstrate resolution in the 3 nm range--comparable to what can be ...

Near-field microscopy of spontaneous THz radiaion

We have developed a THz near-field microscope with an ultrahighly sensitive detector, CSIP (charge-sensitive infrared phototransistor). In our microscope, scattered photons by a tungsten probe are collected by an objective of a confocal THz microscope and are finally detected by the CSIP. To suppress the far-field background, the probe vertically modulated and the signal is demodulated the sign...

Compressed sensing with near-field THz radiation

RAYKO I. STANTCHEV,* DAVID B. PHILLIPS, PETER HOBSON, SAMUEL M. HORNETT, MILES J. PADGETT, AND EUAN HENDRY School of Physics, University of Exeter, Stocker Road, Exeter EX4 4QL, UK SUPA, School of Physics and Astronomy, University of Glasgow, Glasgow G12 8QQ, UK QinetiQ Limited, Cody Technology Park, Ively Road, Farnborough GU14 0LX, UK e-mail: [email protected] *Corresponding author: ris20...