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Super-Resolution Orthogonal Deterministic Imaging Technique for Terahertz Subwavelength Microscopy
journal contribution
posted on 2020-07-02, 17:09 authored by Hichem Guerboukha, Yang Cao, Kathirvel Nallappan, Maksim SkorobogatiyTerahertz subwavelength
imaging aims at developing THz microscopes
able to resolve deeply subwavelength features. To beat the diffraction
limit, the current trend is to use various subwavelength probes to
convert the near-field to the far-field. These techniques offer significant
gains in spatial resolution but suffer from low light throughput and
are slow due to the necessity of a slow pixel-by-pixel raster scan.
In parallel, in the visible spectral range, super-resolution imaging
techniques enhance the image resolution by statistically correlating
multiple frames of an object backlit by stochastically blinking fluorophores.
In this work, we develop a super-resolution imaging technique for
the THz range, that we name super-resolution orthogonal deterministic
imaging (SODI). Since there are no natural THz fluorophores, we design
artificial fluorophores in the form of optimal mask sets brought close
to the object. By deterministically controlling the blinking, we avoid
statistical averages and reconstruct high resolution images using
very few frames. After developing the theoretical basis of SODI, we
experimentally demonstrate the second-order resolution improvement
using only eight phase and binary amplitude masks. We then show how
to extend the SODI technique to higher orders to further improve the
resolution. Our methodology can be readily adapted with existing THz
phase-sensitive single-pixel imaging systems or any THz amplitude
imaging arrays. Finally, this work can be of interest to the optical
community in other wavelengths, as our technique can be used to deterministically
structure light at a subwavelength scale in order to improve the image
resolution with few frames and achieve real-time super-resolution
microscopy.
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Terahertz Subwavelength Microscopy ...fluorophoreSODIdeterministically structure lightSuper-Resolution Orthogonal Determi...pixel-by-pixel raster scansuper-resolution imaging techniquesTHz amplitude imaging arrayssuper-resolution imaging techniqueTHz phase-sensitive single-pixel im...image resolutionname super-resolution orthogonal
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