Fig. 2: Experimental demonstration of super-resolution acousto-optic imaging (AOI) along the transverse (x) axis using 160 speckle realizations.
From: Acousto optic imaging beyond the acoustic diffraction limit using speckle decorrelation
a–e results with large speckle grain size: a target object, \(I(x,y)\) (a section of USAF1963A resolution target), illuminated by a single speckle realization, \({S}_{i}(x,y)\), as imaged directly without the scattering layer. b ultrasonically-tagged optical intensity distribution at the object plane, for one position (\({x}_{us},{y}_{us}\)) of the ultrasound focus, \(h(x,y)\), visualizing the ultrasound focus size. c Detected ultrasound-modulated light pattern for (b), as recorded at the camera plane through the second diffuser. d AOI image profile obtained by scanning the ultrasound focus along the dashed line in a: blue—conventional AOI trace, obtained from the ensemble average of the recorded power at each position; red—square-root of the second-order cumulant of the acousto-optic fluctuations, showing improved resolution; orange—third-order cumulant; black, dashed: cross-section of the target object, along the dashed line in a. e The results from d after deconvolution. f–i as in a, b, d, e, for the small speckle grain size. Acoustic focus width: \(350\ \upmu {\rm{m}}\) FWHM on scanning axis. Scanning direction: from left to right. scale-bars: \(200\ \upmu {\rm{m}}\) (a, b, f–i), \(330\ \upmu {\rm{m}}\) (c).
