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Fibonacci or bifocal terahertz (THz) imaging is demonstrated experimentallyemploying silicon diffractive zone plate (SDZP) in a continuous wave mode.Images simultaneously recorded in two different planes are exhibited at 0.6 THzfrequency with the spatial resolution of wavelength. Multi-focus imagingoperation of the Fibonacci lens is compared with a performance of theconventional silicon phase zone plate. Spatial profiles and focal depthfeatures are discussed varying the frequency from 0.3 THz to 0.6 THz. Goodagreement between experimental results and simulation data is revealed.

Fibonacci terahertz imaging by silicon diffractive optics