After capturing multiple speckle patterns of photoswitchable emitters, our stochastic approach utilizes the speckle correlation property of scattering media to retrieve a super-resolution image.
High precision of localization algorithm enables 100 nm resolution, breaking diffraction limit by factor of 8.
More importantly, we demonstrate our SOSLI to do non-invasive super-resolution imaging through not only static scattering media, but also dynamic scattering media with strong decorrelation such as biological tissues.
Our approach paves the way to noninvasively visualize various samples behind scattering media at unprecedented levels of detail.
Scattering media as multiband pass filters, optical lens, encrypters and spatial multiplexers
Single-shot multispectral imaging with strongly scattering media
We utilise spatial correlation and spectral decorrelation of speckle patterns through a thin scattering media to do optical imaging with multiple spectral filters simultaneously.
The spatial correlation of PSFs allows image recovery with deconvolution techniques, while the spectral decorrelation allows them to play the role of tunable spectral filters in the deconvolution process.
Our demonstrations utilizing optical physics of strongly scattering media and computational imaging present a cost-effective approach for multispectral imaging with many advantages.
Single-shot multi-view imaging enabled by scattering lens
We develop a single-shot multi-view imaging technique by utilizing the natural randomness of scattering media. We exploit the memory effect and uncorrelated point spread functions (PSF) among scattering media.
Both stereo imaging with large disparity and up to seven-view imaging of a 3D object are reconstructed from only one speckle pattern by deconvolution.
Our technique provides a feasible method to capture multi-view imaging with short acquisition time and easy calibration.
Single-shot large field of view imaging with scattering media by spatial demultiplexing
Memory effect allows imaging with just scattering media by deconvolution but its limited region gives a restriction to the field of view (FOV) for imaging.
Regional point spreading functions, which are fixed and only need to be recorded once for all-time use, are employed to recover corresponding spatial regions of an object by deconvolution.
An automatic weighted averaging in an iterative process is performed to obtain the object with significantly enlarged FOV.
Enhancing security of incoherent optical cryptosystem by strongly scattering media
A simplified optical encryption system only contains one diffuser acting as the random phase mask (RPM).
The use of ultra-broadband illumination has the advantage of reducing the speckle contrast that makes the ciphertext more complex. Reduction of the ciphertext size further increases the strength of the ciphering.
Using the spatial decorrelation of the speckle pattern we have demonstrated a position multiplexed based cryptosystem, where the ciphertext is the superposition of uniquely encrypted texts from various spatial positions.
Benefiting from position-multiplexing, the information of interest is scrambled together by a truly random method in a smaller ciphertext.
