Abstract
A terahertz (THz) imaging system based on narrow band microbolometer sensors (NBMS) and a novel diffractive lens was developed for spectroscopic microscopy applications. The frequency response characteristics of the THz antenna-coupled NBMS were determined employing Fourier transform spectroscopy. The NBMS was found to be a very sensitive frequency selective sensor which was used to develop a compact all-electronic system for multispectral THz measurements. This system was successfully applied for principal components analysis of optically opaque packed samples. A thin diffractive lens with a numerical aperture of 0.62 was proposed for the reduction of system dimensions. The THz imaging system enhanced with novel optics was used to image for the first time non-neoplastic and neoplastic human colon tissues with close to wavelength-limited spatial resolution at 584 GHz frequency. The results demonstrated the new potential of compact RT THz imaging systems in the fields of spectroscopic analysis of materials and medical diagnostics.
Highlights
Radiation of terahertz (THz) frequency offers non-destructive and non-ionizing ways of imaging and spectroscopy stimulating the development of THz technologies for security, medicine, biochemical, and materials science [1,2]
Exploring the performance of the THz imaging system such as high signal to noise ratio Exploring the performance of the THz imaging system such as high signal to noise ratio provided provided by the narrow band microbolometer sensors (NBMS)’s and high spatial resolution provided by the TZP, there was an interest to by the NBMS’s and high spatial resolution provided by the TZP, there was an interest to emulate emulate functionality of the confocal THz microscope as complementary tool for pathology
The spectral performance of the THz sensors based on air-bridged Ti-microbolometers coupled with a dipole antenna has been measured experimentally by Fourier transform infrared (FTIR) spectroscopy at room temperature
Summary
Radiation of terahertz (THz) frequency offers non-destructive and non-ionizing ways of imaging and spectroscopy stimulating the development of THz technologies for security, medicine, biochemical, and materials science [1,2]. Values of minimum detectable powers per pixel were comparable with those of other compact THz detectors, such as uncooled field effect transistor (FET) THz sensors and cooled bolometer arrays demonstrating large potential in the frequency range of 0.3–4.3 THz. On the other hand, the French Institut National d’Optique (INO) has developed a THz imaging system capable of detecting concealed weapons or hidden objects behind drywall, and for non-destructive testing military applications [11]. It was not possible to demonstrate wavelength limited operation without a stable THz source emitting Gaussian mode beam Such a novel diffractive lens was found to be more efficient in terms of frequency selection and high aspect-ratio focusing in a single device. Imaging system enhanced with novel TZP was proposed for biomedical microscopy applications For this purpose dehydrated human colon tissues were imaged at a frequency of 584 GHz. Higher contrast and close to wavelength limited spatial resolution were observed in the measured.
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