Single-chip source-free terahertz spectroscope across 004–099 THz: combining sub-wavelength near-field sensing and regression analysis
نویسندگان
چکیده
منابع مشابه
Sub-wavelength terahertz beam profiling of a THz source via an all-optical knife-edge technique
Terahertz technologies recently emerged as outstanding candidates for a variety of applications in such sectors as security, biomedical, pharmaceutical, aero spatial, etc. Imaging the terahertz field, however, still remains a challenge, particularly when sub-wavelength resolutions are involved. Here we demonstrate an all-optical technique for the terahertz near-field imaging directly at the sou...
متن کاملCompressed 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...
متن کاملComprehensive modeling of THz microscope with a sub-wavelength source.
The sub-wavelength THz emission point on a nonlinear electrooptical crystal, used in broadband THz near-field emission microscopy, is computationally modeled as a radiating aperture of Gaussian intensity profile. This paper comprehensively studies the Gaussian aperture model in the THz near-field regime and validates the findings with dual-axis knife-edge experiments. Based on realistic paramet...
متن کاملTerahertz polarization spectroscopy in the near-field zone of a sub-wavelength-scale metal slit.
Time-domain spectroscopy is used to probe the polarization dependence of the terahertz-frequency absorption of α-lactose molecules in the near-field vicinity of a sub-wavelength-scale metal slit. The experimental result finds that the 0.53-THz absorption of this material has an unexpected polarization dependence, strongly coupled to the slit orientation; in particular, the electric wave in para...
متن کاملSpectroscopic 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...
متن کاملذخیره در منابع من
با ذخیره ی این منبع در منابع من، دسترسی به آن را برای استفاده های بعدی آسان تر کنید
ژورنال
عنوان ژورنال: Optics Express
سال: 2018
ISSN: 1094-4087
DOI: 10.1364/oe.26.007163