High-resolution terahertz imaging of biological objects and tissues: A review and original results
Terahertz (THz) solid immersion microscopy is a novel THz imaging modality, which provides both a subwavelength spatial resolution and a high energy efficiency, thanks to the
absence of sub-wavelength apertures and probes in an optical scheme. In this work, we apply the finite-difference time-domain technique for solving the Maxwell’s equations in order to analyze the performance of our original THz solid immersion lens (SIL) arrangement. Namely, we estimate the theoretical limits for the spatial resolution and the depth of field of our optical system, as well as specify the tolerances for the alignment of optical elements. The observed results demonstrate the resolution of 0.15λ and the depth of field of 0.12λ (λ is an electromagnetic wavelength), justifying advanced performance of our THz SIL.
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A.M. Prokhorov General Physics Institute of the Russian Academy of Sciences
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