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Bolometric THz-to-IR converter for terahertz imaging
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Image of FIG. 1.
FIG. 1.

(Color online) Scheme of THz-to-IR converter (left) and top view of topological pattern of split-ring resonators (right). FSS––frequency selective surface (metasurface), PP––polypropylene, “GL”––“ground” layer, EL––IR emissive layer, AIS––artificial impedance surface.

Image of FIG. 2.
FIG. 2.

(Color online) Absorptivity spectra of the absorber for two orthogonal polarizations.

Image of FIG. 3.
FIG. 3.

(Color online) Terahertz imaging system based on THz-to-IR converter and IR bolometric camera. BWO––backward wave oscillator. Lens in front of converter is optional.

Image of FIG. 4.
FIG. 4.

(Color online) IR image of unfocused BWO beam at resonant frequency 0.3 THz. Converter diameter––32 mm. Half-width of the beam is around 16 mm. Image cross-section is shown below.

Image of FIG. 5.
FIG. 5.

(Color online) Image transformation of the focused BWO beam with linear polarization during converter rotation. Image cross-section is shown below. Converter resonant frequency––0.3 THz. Beam polarization is perpendicular to SRR gaps at the beginning of rotation and parallel to SRR gaps at the end of rotation (enhanced online) [URL: http://dx.doi.org/10.1063/1.3607474.1].10.1063/1.3607474.1

Image of FIG. 6.
FIG. 6.

Real-time free movement of the focused beam along the converter surface (enhanced online) [URL: http://dx.doi.org/10.1063/1.3607474.2].10.1063/1.3607474.2



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752b84549af89a08dbdd7fdb8b9568b5 journal.articlezxybnytfddd
Scitation: Bolometric THz-to-IR converter for terahertz imaging