October 2018
Spotlight Summary by Shakil Rehman
Reference-free polarization-sensitive quantitative phase imaging using single-point optical phase conjugation
Innovations in holography are helping to develop new technologies and applications. Holography is used for quantitative assessment of amplitude and phase of an object, thereby providing a wealth of information, not just the fancy reconstruction of 3D images. But so far holography has been limited by its requirement of a reference field and a 2D imaging sensor. Authors of this article in Optics Express have demonstrated a new version of holography, called single-point holography, with the help of a spatial light modulator and a point detector. In this method, an input object field is modulated by its complex conjugate field pattern displayed on the spatial light modulator such that the scattered light becomes like a plane wave. This complex conjugate image, out of several thousand properly designed binary images written on a DMD (Digital Micromirror Device), gives a maximum intensity response at the point detector and hence provides complete amplitude and phase information of the object. In the current scheme, the concept of single-point holography is further extended to polarization-sensitive holographic microscopy, without using an imaging sensor, to assess anisotropic properties of birefringent materials with quantitative phase imaging. The technique can be extended to wavelengths beyond the visible spectrum, thereby creating new applications.
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Article Information
Reference-free polarization-sensitive quantitative phase imaging using single-point optical phase conjugation
Seungwoo Shin, KyeoReh Lee, Zahid Yaqoob, Peter T. C. So, and YongKeun Park
Opt. Express 26(21) 26858-26865 (2018) View: Abstract | HTML | PDF