Terahertz in-line digital holography of dragonfly hindwing: amplitude and phase reconstruction at enhanced resolution by extrapolation

Abstract

We report here on terahertz (THz) digital holography on a biological specimen. A continuous-wave (CW) THz in-line holographic setup was built based on a 2.52 THz CO2 pumped THz laser and a pyroelectric array detector. We introduced novel statistical method of obtaining true intensity values for the pyroelectric array detector's pixels. Absorption and phase-shifting images of a dragonfly's hind wing were reconstructed simultaneously from single in-line hologram. Furthermore, we applied phase retrieval routines to eliminate twin image and enhanced the resolution of the reconstructions by hologram extrapolation beyond the detector area. The finest observed features are 35 μm width cross veins.

16 pages, 7 figures

References in corpus (2)

• Solution to the twin image problem in holography
• Re-sampling of inline holographic images for improved reconstruction resolution

Cited by in corpus (4)

• Iterative phase retrieval for digital holography
• Reconstruction of purely absorbing, absorbing and phase-shifting, and strong phase-shifting objects from their single-shot in-line holograms
• Phase retrieval methods applied to coherent imaging
• Criteria for objects suitable for reconstruction from holograms and diffraction patterns