Spatiotemporal heterodyne detection
Michael Atlan (IJM), Michel Gross (LKB - Lhomond)
TL;DR
This paper introduces a novel heterodyne detection scheme that transforms a camera into a tunable, high-resolution spectral filter for coherent imaging, utilizing spatial and temporal modulation to reject noise.
Contribution
It presents a new method for parallel spectral imaging with a camera using off-axis heterodyne mixing and dynamic noise rejection techniques.
Findings
Successful experimental demonstration with Brownian motion particles
Achieved high spectral resolution with a few Hertz bandwidth
Enabled efficient noise filtering in coherent imaging
Abstract
We describe a scheme into which a camera is turned into an efficient tunable frequency filter of a few Hertz bandwidth in an off-axis, heterodyne optical mixing configuration, enabling to perform parallel, high-resolution coherent spectral imaging. This approach is made possible through the combination of a spatial and temporal modulation of the signal to reject noise contributions. Experimental data obtained with dynamically scattered light by a suspension of particles in brownian motion is interpreted.
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