Abstract
The word ‘holography' means a drawing that contains all of the information for light—both amplitude and wavefront. However, because of the insufficient bandwidth of current electronics, the direct measurement of the wavefront of light has not yet been achieved. Though reference-field-assisted interferometric methods have been utilized in numerous applications, introducing a reference field raises several fundamental and practical issues. Here we demonstrate a reference-free holographic image sensor. To achieve this, we propose a speckle-correlation scattering matrix approach; light-field information passing through a thin disordered layer is recorded and retrieved from a single-shot recording of speckle intensity patterns. Self-interference via diffusive scattering enables access to impinging light-field information, when light transport in the diffusive layer is precisely calibrated. As a proof-of-concept, we demonstrate direct holographic measurements of three-dimensional optical fields using a compact device consisting of a regular image sensor and a diffusor.
Highlights
The word ‘holography’ means a drawing that contains all of the information for light—both amplitude and wavefront
One prime reason is the practical issues of introducing a reference field
We overcame this limitation by using the random nature of diffused light inspired by the Siegert relation of temporally random light[26] and achieved referencefree holographic imaging using a commercial diffuser as a holographic imaging system (Fig. 1d)
Summary
The word ‘holography’ means a drawing that contains all of the information for light—both amplitude and wavefront. Ideal holography would be a method that directly captures the incident field rather than intensity without any additional constraints (Fig. 1c).
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