Abstract
We present a novel THz computed tomography system that enables fast 3-dimensional imaging and spectroscopy in the 0.6-1.2 THz band. The system is based on a new real-time broadband THz camera that enables rapid acquisition of multiple cross-sectional images required in computed tomography. Tomographic reconstruction is achieved using digital images from the densely-packed large-format (80×64) focal plane array sensor located behind a hyper-hemispherical silicon lens. Each pixel of the sensor array consists of an 85 μm × 92 μm lithographically fabricated wideband dual-slot antenna, monolithically integrated with an ultra-fast diode tuned to operate in the 0.6-1.2 THz regime. Concurrently, optimum impedance matching was implemented for maximum pixel sensitivity, enabling 5 frames-per-second image acquisition speed. As such, the THz computed tomography system generates diffraction-limited resolution cross-section images as well as the three-dimensional models of various opaque and partially transparent objects. As an example, an over-the-counter vitamin supplement pill is imaged and its material composition is reconstructed. The new THz camera enables, for the first time, a practical application of THz computed tomography for non-destructive evaluation and biomedical imaging.
Original language | English (US) |
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Pages (from-to) | 675-686 |
Number of pages | 12 |
Journal | Journal of Infrared, Millimeter, and Terahertz Waves |
Volume | 36 |
Issue number | 7 |
DOIs | |
State | Published - Jul 5 2015 |
Externally published | Yes |
Keywords
- Focal plane arrays
- THz camera
- THz computed tomography
- THz imaging
ASJC Scopus subject areas
- Radiation
- Instrumentation
- Condensed Matter Physics
- Electrical and Electronic Engineering